e4c3673923
Summary: I was bit by this when developing SpatialDB. In case all files are at level 0, CompactRange() will output the compacted files to level 0. This is not ideal, since read amp. is much better at level 1 and higher. Test Plan: Compacted data in SpatialDB, read manifest using ldb, verified that files are now at level 1 instead of 0. Reviewers: sdong, ljin, yhchiang, dhruba Reviewed By: dhruba Subscribers: dhruba, leveldb Differential Revision: https://reviews.facebook.net/D20901
4900 lines
171 KiB
C++
4900 lines
171 KiB
C++
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include "db/db_impl.h"
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#define __STDC_FORMAT_MACROS
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#include <inttypes.h>
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#include <algorithm>
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#include <climits>
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#include <cstdio>
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#include <set>
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#include <stdexcept>
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#include <stdint.h>
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#include <string>
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#include <unordered_set>
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#include <unordered_map>
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#include <utility>
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#include <vector>
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#include "db/builder.h"
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#include "db/db_iter.h"
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#include "db/dbformat.h"
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#include "db/filename.h"
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#include "db/log_reader.h"
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#include "db/log_writer.h"
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#include "db/memtable.h"
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#include "db/memtable_list.h"
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#include "db/merge_context.h"
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#include "db/merge_helper.h"
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#include "db/table_cache.h"
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#include "db/table_properties_collector.h"
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#include "db/tailing_iter.h"
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#include "db/forward_iterator.h"
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#include "db/transaction_log_impl.h"
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#include "db/version_set.h"
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#include "db/write_batch_internal.h"
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#include "port/port.h"
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#include "rocksdb/cache.h"
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#include "port/likely.h"
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#include "rocksdb/compaction_filter.h"
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#include "rocksdb/db.h"
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#include "rocksdb/env.h"
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#include "rocksdb/merge_operator.h"
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#include "rocksdb/statistics.h"
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#include "rocksdb/status.h"
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#include "rocksdb/table.h"
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#include "table/block.h"
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#include "table/block_based_table_factory.h"
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#include "table/merger.h"
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#include "table/table_builder.h"
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#include "table/two_level_iterator.h"
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#include "util/auto_roll_logger.h"
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#include "util/autovector.h"
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#include "util/build_version.h"
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#include "util/coding.h"
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#include "util/hash_skiplist_rep.h"
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#include "util/hash_linklist_rep.h"
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#include "util/logging.h"
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#include "util/log_buffer.h"
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#include "util/mutexlock.h"
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#include "util/perf_context_imp.h"
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#include "util/iostats_context_imp.h"
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#include "util/stop_watch.h"
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#include "util/sync_point.h"
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namespace rocksdb {
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const std::string kDefaultColumnFamilyName("default");
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void DumpLeveldbBuildVersion(Logger * log);
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// Information kept for every waiting writer
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struct DBImpl::Writer {
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Status status;
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WriteBatch* batch;
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bool sync;
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bool disableWAL;
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bool in_batch_group;
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bool done;
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uint64_t timeout_hint_us;
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port::CondVar cv;
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explicit Writer(port::Mutex* mu) : cv(mu) { }
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};
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struct DBImpl::CompactionState {
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Compaction* const compaction;
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// If there were two snapshots with seq numbers s1 and
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// s2 and s1 < s2, and if we find two instances of a key k1 then lies
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// entirely within s1 and s2, then the earlier version of k1 can be safely
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// deleted because that version is not visible in any snapshot.
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std::vector<SequenceNumber> existing_snapshots;
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// Files produced by compaction
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struct Output {
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uint64_t number;
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uint32_t path_id;
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uint64_t file_size;
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InternalKey smallest, largest;
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SequenceNumber smallest_seqno, largest_seqno;
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};
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std::vector<Output> outputs;
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std::list<uint64_t> allocated_file_numbers;
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// State kept for output being generated
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unique_ptr<WritableFile> outfile;
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unique_ptr<TableBuilder> builder;
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uint64_t total_bytes;
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Output* current_output() { return &outputs[outputs.size()-1]; }
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explicit CompactionState(Compaction* c)
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: compaction(c),
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total_bytes(0) {
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}
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// Create a client visible context of this compaction
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CompactionFilter::Context GetFilterContextV1() {
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CompactionFilter::Context context;
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context.is_full_compaction = compaction->IsFullCompaction();
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context.is_manual_compaction = compaction->IsManualCompaction();
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return context;
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}
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// Create a client visible context of this compaction
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CompactionFilterContext GetFilterContext() {
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CompactionFilterContext context;
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context.is_full_compaction = compaction->IsFullCompaction();
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context.is_manual_compaction = compaction->IsManualCompaction();
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return context;
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}
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std::vector<Slice> key_buf_;
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std::vector<Slice> existing_value_buf_;
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std::vector<std::string> key_str_buf_;
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std::vector<std::string> existing_value_str_buf_;
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// new_value_buf_ will only be appended if a value changes
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std::vector<std::string> new_value_buf_;
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// if values_changed_buf_[i] is true
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// new_value_buf_ will add a new entry with the changed value
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std::vector<bool> value_changed_buf_;
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// to_delete_buf_[i] is true iff key_buf_[i] is deleted
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std::vector<bool> to_delete_buf_;
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// buffer for the parsed internal keys, the string buffer is backed
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// by key_str_buf_
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std::vector<ParsedInternalKey> ikey_buf_;
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std::vector<Slice> other_key_buf_;
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std::vector<Slice> other_value_buf_;
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std::vector<std::string> other_key_str_buf_;
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std::vector<std::string> other_value_str_buf_;
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std::vector<Slice> combined_key_buf_;
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std::vector<Slice> combined_value_buf_;
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std::string cur_prefix_;
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// Buffers the kv-pair that will be run through compaction filter V2
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// in the future.
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void BufferKeyValueSlices(const Slice& key, const Slice& value) {
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key_str_buf_.emplace_back(key.ToString());
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existing_value_str_buf_.emplace_back(value.ToString());
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key_buf_.emplace_back(Slice(key_str_buf_.back()));
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existing_value_buf_.emplace_back(Slice(existing_value_str_buf_.back()));
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ParsedInternalKey ikey;
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ParseInternalKey(key_buf_.back(), &ikey);
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ikey_buf_.emplace_back(ikey);
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}
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// Buffers the kv-pair that will not be run through compaction filter V2
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// in the future.
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void BufferOtherKeyValueSlices(const Slice& key, const Slice& value) {
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other_key_str_buf_.emplace_back(key.ToString());
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other_value_str_buf_.emplace_back(value.ToString());
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other_key_buf_.emplace_back(Slice(other_key_str_buf_.back()));
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other_value_buf_.emplace_back(Slice(other_value_str_buf_.back()));
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}
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// Add a kv-pair to the combined buffer
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void AddToCombinedKeyValueSlices(const Slice& key, const Slice& value) {
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// The real strings are stored in the batch buffers
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combined_key_buf_.emplace_back(key);
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combined_value_buf_.emplace_back(value);
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}
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// Merging the two buffers
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void MergeKeyValueSliceBuffer(const InternalKeyComparator* comparator) {
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size_t i = 0;
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size_t j = 0;
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size_t total_size = key_buf_.size() + other_key_buf_.size();
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combined_key_buf_.reserve(total_size);
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combined_value_buf_.reserve(total_size);
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while (i + j < total_size) {
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int comp_res = 0;
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if (i < key_buf_.size() && j < other_key_buf_.size()) {
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comp_res = comparator->Compare(key_buf_[i], other_key_buf_[j]);
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} else if (i >= key_buf_.size() && j < other_key_buf_.size()) {
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comp_res = 1;
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} else if (j >= other_key_buf_.size() && i < key_buf_.size()) {
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comp_res = -1;
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}
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if (comp_res > 0) {
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AddToCombinedKeyValueSlices(other_key_buf_[j], other_value_buf_[j]);
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j++;
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} else if (comp_res < 0) {
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AddToCombinedKeyValueSlices(key_buf_[i], existing_value_buf_[i]);
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i++;
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}
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}
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}
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void CleanupBatchBuffer() {
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to_delete_buf_.clear();
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key_buf_.clear();
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existing_value_buf_.clear();
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key_str_buf_.clear();
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existing_value_str_buf_.clear();
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new_value_buf_.clear();
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value_changed_buf_.clear();
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ikey_buf_.clear();
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to_delete_buf_.shrink_to_fit();
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key_buf_.shrink_to_fit();
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existing_value_buf_.shrink_to_fit();
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key_str_buf_.shrink_to_fit();
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existing_value_str_buf_.shrink_to_fit();
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new_value_buf_.shrink_to_fit();
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value_changed_buf_.shrink_to_fit();
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ikey_buf_.shrink_to_fit();
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other_key_buf_.clear();
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other_value_buf_.clear();
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other_key_str_buf_.clear();
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other_value_str_buf_.clear();
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other_key_buf_.shrink_to_fit();
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other_value_buf_.shrink_to_fit();
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other_key_str_buf_.shrink_to_fit();
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other_value_str_buf_.shrink_to_fit();
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}
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void CleanupMergedBuffer() {
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combined_key_buf_.clear();
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combined_value_buf_.clear();
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combined_key_buf_.shrink_to_fit();
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combined_value_buf_.shrink_to_fit();
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}
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};
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namespace {
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// Fix user-supplied options to be reasonable
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template <class T, class V>
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static void ClipToRange(T* ptr, V minvalue, V maxvalue) {
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if (static_cast<V>(*ptr) > maxvalue) *ptr = maxvalue;
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if (static_cast<V>(*ptr) < minvalue) *ptr = minvalue;
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}
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} // anonymous namespace
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Options SanitizeOptions(const std::string& dbname,
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const InternalKeyComparator* icmp,
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const InternalFilterPolicy* ipolicy,
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const Options& src) {
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auto db_options = SanitizeOptions(dbname, DBOptions(src));
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auto cf_options = SanitizeOptions(icmp, ipolicy, ColumnFamilyOptions(src));
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return Options(db_options, cf_options);
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}
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DBOptions SanitizeOptions(const std::string& dbname, const DBOptions& src) {
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DBOptions result = src;
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// result.max_open_files means an "infinite" open files.
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if (result.max_open_files != -1) {
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ClipToRange(&result.max_open_files, 20, 1000000);
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}
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if (result.info_log == nullptr) {
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Status s = CreateLoggerFromOptions(dbname, result.db_log_dir, src.env,
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result, &result.info_log);
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if (!s.ok()) {
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// No place suitable for logging
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result.info_log = nullptr;
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}
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}
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if (result.wal_dir.empty()) {
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// Use dbname as default
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result.wal_dir = dbname;
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}
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if (result.wal_dir.back() == '/') {
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result.wal_dir = result.wal_dir.substr(0, result.wal_dir.size() - 1);
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}
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if (result.db_paths.size() == 0) {
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result.db_paths.emplace_back(dbname, std::numeric_limits<uint64_t>::max());
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}
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return result;
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}
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namespace {
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CompressionType GetCompressionFlush(const Options& options) {
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// Compressing memtable flushes might not help unless the sequential load
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// optimization is used for leveled compaction. Otherwise the CPU and
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// latency overhead is not offset by saving much space.
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bool can_compress;
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if (options.compaction_style == kCompactionStyleUniversal) {
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can_compress =
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(options.compaction_options_universal.compression_size_percent < 0);
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} else {
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// For leveled compress when min_level_to_compress == 0.
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can_compress = options.compression_per_level.empty() ||
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options.compression_per_level[0] != kNoCompression;
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}
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if (can_compress) {
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return options.compression;
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} else {
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return kNoCompression;
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}
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}
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} // namespace
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DBImpl::DBImpl(const DBOptions& options, const std::string& dbname)
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: env_(options.env),
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dbname_(dbname),
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options_(SanitizeOptions(dbname, options)),
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stats_(options_.statistics.get()),
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db_lock_(nullptr),
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mutex_(options.use_adaptive_mutex),
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shutting_down_(nullptr),
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bg_cv_(&mutex_),
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logfile_number_(0),
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log_empty_(true),
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default_cf_handle_(nullptr),
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total_log_size_(0),
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max_total_in_memory_state_(0),
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tmp_batch_(),
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bg_schedule_needed_(false),
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bg_compaction_scheduled_(0),
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bg_manual_only_(0),
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bg_flush_scheduled_(0),
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manual_compaction_(nullptr),
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disable_delete_obsolete_files_(0),
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delete_obsolete_files_last_run_(options.env->NowMicros()),
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purge_wal_files_last_run_(0),
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last_stats_dump_time_microsec_(0),
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default_interval_to_delete_obsolete_WAL_(600),
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flush_on_destroy_(false),
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delayed_writes_(0),
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storage_options_(options),
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bg_work_gate_closed_(false),
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refitting_level_(false),
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opened_successfully_(false) {
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env_->GetAbsolutePath(dbname, &db_absolute_path_);
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// Reserve ten files or so for other uses and give the rest to TableCache.
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// Give a large number for setting of "infinite" open files.
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const int table_cache_size =
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(options_.max_open_files == -1) ? 4194304 : options_.max_open_files - 10;
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// Reserve ten files or so for other uses and give the rest to TableCache.
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table_cache_ =
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NewLRUCache(table_cache_size, options_.table_cache_numshardbits,
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options_.table_cache_remove_scan_count_limit);
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versions_.reset(
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new VersionSet(dbname_, &options_, storage_options_, table_cache_.get()));
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column_family_memtables_.reset(
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new ColumnFamilyMemTablesImpl(versions_->GetColumnFamilySet()));
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DumpLeveldbBuildVersion(options_.info_log.get());
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options_.Dump(options_.info_log.get());
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LogFlush(options_.info_log);
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}
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DBImpl::~DBImpl() {
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mutex_.Lock();
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if (flush_on_destroy_) {
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for (auto cfd : *versions_->GetColumnFamilySet()) {
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if (cfd->mem()->GetFirstSequenceNumber() != 0) {
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cfd->Ref();
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mutex_.Unlock();
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FlushMemTable(cfd, FlushOptions());
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mutex_.Lock();
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cfd->Unref();
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}
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}
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versions_->GetColumnFamilySet()->FreeDeadColumnFamilies();
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}
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// Wait for background work to finish
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shutting_down_.Release_Store(this); // Any non-nullptr value is ok
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while (bg_compaction_scheduled_ || bg_flush_scheduled_) {
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bg_cv_.Wait();
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}
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if (default_cf_handle_ != nullptr) {
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// we need to delete handle outside of lock because it does its own locking
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mutex_.Unlock();
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delete default_cf_handle_;
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mutex_.Lock();
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}
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if (options_.allow_thread_local) {
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// Clean up obsolete files due to SuperVersion release.
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// (1) Need to delete to obsolete files before closing because RepairDB()
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// scans all existing files in the file system and builds manifest file.
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// Keeping obsolete files confuses the repair process.
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// (2) Need to check if we Open()/Recover() the DB successfully before
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// deleting because if VersionSet recover fails (may be due to corrupted
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// manifest file), it is not able to identify live files correctly. As a
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// result, all "live" files can get deleted by accident. However, corrupted
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// manifest is recoverable by RepairDB().
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if (opened_successfully_) {
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DeletionState deletion_state;
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FindObsoleteFiles(deletion_state, true);
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// manifest number starting from 2
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deletion_state.manifest_file_number = 1;
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if (deletion_state.HaveSomethingToDelete()) {
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PurgeObsoleteFiles(deletion_state);
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}
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}
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}
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// versions need to be destroyed before table_cache since it can hold
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// references to table_cache.
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versions_.reset();
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mutex_.Unlock();
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if (db_lock_ != nullptr) {
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env_->UnlockFile(db_lock_);
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}
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LogFlush(options_.info_log);
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}
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Status DBImpl::NewDB() {
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VersionEdit new_db;
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new_db.SetLogNumber(0);
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new_db.SetNextFile(2);
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new_db.SetLastSequence(0);
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const std::string manifest = DescriptorFileName(dbname_, 1);
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unique_ptr<WritableFile> file;
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Status s = env_->NewWritableFile(
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manifest, &file, env_->OptimizeForManifestWrite(storage_options_));
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if (!s.ok()) {
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return s;
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}
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file->SetPreallocationBlockSize(options_.manifest_preallocation_size);
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{
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log::Writer log(std::move(file));
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std::string record;
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new_db.EncodeTo(&record);
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s = log.AddRecord(record);
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}
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if (s.ok()) {
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// Make "CURRENT" file that points to the new manifest file.
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s = SetCurrentFile(env_, dbname_, 1, db_directory_.get());
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} else {
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env_->DeleteFile(manifest);
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}
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return s;
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}
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void DBImpl::MaybeIgnoreError(Status* s) const {
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if (s->ok() || options_.paranoid_checks) {
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// No change needed
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|
} else {
|
|
Log(options_.info_log, "Ignoring error %s", s->ToString().c_str());
|
|
*s = Status::OK();
|
|
}
|
|
}
|
|
|
|
const Status DBImpl::CreateArchivalDirectory() {
|
|
if (options_.WAL_ttl_seconds > 0 || options_.WAL_size_limit_MB > 0) {
|
|
std::string archivalPath = ArchivalDirectory(options_.wal_dir);
|
|
return env_->CreateDirIfMissing(archivalPath);
|
|
}
|
|
return Status::OK();
|
|
}
|
|
|
|
void DBImpl::PrintStatistics() {
|
|
auto dbstats = options_.statistics.get();
|
|
if (dbstats) {
|
|
Log(options_.info_log,
|
|
"STATISTCS:\n %s",
|
|
dbstats->ToString().c_str());
|
|
}
|
|
}
|
|
|
|
void DBImpl::MaybeDumpStats() {
|
|
if (options_.stats_dump_period_sec == 0) return;
|
|
|
|
const uint64_t now_micros = env_->NowMicros();
|
|
|
|
if (last_stats_dump_time_microsec_ +
|
|
options_.stats_dump_period_sec * 1000000
|
|
<= now_micros) {
|
|
// Multiple threads could race in here simultaneously.
|
|
// However, the last one will update last_stats_dump_time_microsec_
|
|
// atomically. We could see more than one dump during one dump
|
|
// period in rare cases.
|
|
last_stats_dump_time_microsec_ = now_micros;
|
|
|
|
DBPropertyType cf_property_type = GetPropertyType("rocksdb.cfstats");
|
|
DBPropertyType db_property_type = GetPropertyType("rocksdb.dbstats");
|
|
std::string stats;
|
|
{
|
|
MutexLock l(&mutex_);
|
|
for (auto cfd : *versions_->GetColumnFamilySet()) {
|
|
cfd->internal_stats()->GetProperty(
|
|
cf_property_type, "rocksdb.cfstats", &stats);
|
|
}
|
|
default_cf_internal_stats_->GetProperty(
|
|
db_property_type, "rocksdb.dbstats", &stats);
|
|
}
|
|
Log(options_.info_log, "------- DUMPING STATS -------");
|
|
Log(options_.info_log, "%s", stats.c_str());
|
|
|
|
PrintStatistics();
|
|
}
|
|
}
|
|
|
|
// Returns the list of live files in 'sst_live' and the list
|
|
// of all files in the filesystem in 'candidate_files'.
|
|
// no_full_scan = true -- never do the full scan using GetChildren()
|
|
// force = false -- don't force the full scan, except every
|
|
// options_.delete_obsolete_files_period_micros
|
|
// force = true -- force the full scan
|
|
void DBImpl::FindObsoleteFiles(DeletionState& deletion_state,
|
|
bool force,
|
|
bool no_full_scan) {
|
|
mutex_.AssertHeld();
|
|
|
|
// if deletion is disabled, do nothing
|
|
if (disable_delete_obsolete_files_ > 0) {
|
|
return;
|
|
}
|
|
|
|
bool doing_the_full_scan = false;
|
|
|
|
// logic for figurint out if we're doing the full scan
|
|
if (no_full_scan) {
|
|
doing_the_full_scan = false;
|
|
} else if (force || options_.delete_obsolete_files_period_micros == 0) {
|
|
doing_the_full_scan = true;
|
|
} else {
|
|
const uint64_t now_micros = env_->NowMicros();
|
|
if (delete_obsolete_files_last_run_ +
|
|
options_.delete_obsolete_files_period_micros < now_micros) {
|
|
doing_the_full_scan = true;
|
|
delete_obsolete_files_last_run_ = now_micros;
|
|
}
|
|
}
|
|
|
|
// get obsolete files
|
|
versions_->GetObsoleteFiles(&deletion_state.sst_delete_files);
|
|
|
|
// store the current filenum, lognum, etc
|
|
deletion_state.manifest_file_number = versions_->ManifestFileNumber();
|
|
deletion_state.pending_manifest_file_number =
|
|
versions_->PendingManifestFileNumber();
|
|
deletion_state.log_number = versions_->MinLogNumber();
|
|
deletion_state.prev_log_number = versions_->PrevLogNumber();
|
|
|
|
if (!doing_the_full_scan && !deletion_state.HaveSomethingToDelete()) {
|
|
// avoid filling up sst_live if we're sure that we
|
|
// are not going to do the full scan and that we don't have
|
|
// anything to delete at the moment
|
|
return;
|
|
}
|
|
|
|
// don't delete live files
|
|
for (auto pair : pending_outputs_) {
|
|
deletion_state.sst_live.emplace_back(pair.first, pair.second, 0);
|
|
}
|
|
/* deletion_state.sst_live.insert(pending_outputs_.begin(),
|
|
pending_outputs_.end());*/
|
|
versions_->AddLiveFiles(&deletion_state.sst_live);
|
|
|
|
if (doing_the_full_scan) {
|
|
for (uint32_t path_id = 0; path_id < options_.db_paths.size(); path_id++) {
|
|
// set of all files in the directory. We'll exclude files that are still
|
|
// alive in the subsequent processings.
|
|
std::vector<std::string> files;
|
|
env_->GetChildren(dbname_, &files); // Ignore errors
|
|
for (std::string file : files) {
|
|
deletion_state.candidate_files.emplace_back(file, path_id);
|
|
}
|
|
}
|
|
|
|
//Add log files in wal_dir
|
|
if (options_.wal_dir != dbname_) {
|
|
std::vector<std::string> log_files;
|
|
env_->GetChildren(options_.wal_dir, &log_files); // Ignore errors
|
|
for (std::string log_file : log_files) {
|
|
deletion_state.candidate_files.emplace_back(log_file, 0);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
namespace {
|
|
bool CompareCandidateFile(const rocksdb::DBImpl::CandidateFileInfo& first,
|
|
const rocksdb::DBImpl::CandidateFileInfo& second) {
|
|
if (first.file_name > second.file_name) {
|
|
return true;
|
|
} else if (first.file_name < second.file_name) {
|
|
return false;
|
|
} else {
|
|
return (first.path_id > first.path_id);
|
|
}
|
|
}
|
|
}; // namespace
|
|
|
|
// Diffs the files listed in filenames and those that do not
|
|
// belong to live files are posibly removed. Also, removes all the
|
|
// files in sst_delete_files and log_delete_files.
|
|
// It is not necessary to hold the mutex when invoking this method.
|
|
void DBImpl::PurgeObsoleteFiles(DeletionState& state) {
|
|
// we'd better have sth to delete
|
|
assert(state.HaveSomethingToDelete());
|
|
|
|
// this checks if FindObsoleteFiles() was run before. If not, don't do
|
|
// PurgeObsoleteFiles(). If FindObsoleteFiles() was run, we need to also
|
|
// run PurgeObsoleteFiles(), even if disable_delete_obsolete_files_ is true
|
|
if (state.manifest_file_number == 0) {
|
|
return;
|
|
}
|
|
|
|
// Now, convert live list to an unordered map, WITHOUT mutex held;
|
|
// set is slow.
|
|
std::unordered_map<uint64_t, const FileDescriptor*> sst_live_map;
|
|
for (FileDescriptor& fd : state.sst_live) {
|
|
sst_live_map[fd.GetNumber()] = &fd;
|
|
}
|
|
|
|
auto& candidate_files = state.candidate_files;
|
|
candidate_files.reserve(
|
|
candidate_files.size() +
|
|
state.sst_delete_files.size() +
|
|
state.log_delete_files.size());
|
|
// We may ignore the dbname when generating the file names.
|
|
const char* kDumbDbName = "";
|
|
for (auto file : state.sst_delete_files) {
|
|
candidate_files.emplace_back(
|
|
MakeTableFileName(kDumbDbName, file->fd.GetNumber()),
|
|
file->fd.GetPathId());
|
|
delete file;
|
|
}
|
|
|
|
for (auto file_num : state.log_delete_files) {
|
|
if (file_num > 0) {
|
|
candidate_files.emplace_back(LogFileName(kDumbDbName, file_num).substr(1),
|
|
0);
|
|
}
|
|
}
|
|
|
|
// dedup state.candidate_files so we don't try to delete the same
|
|
// file twice
|
|
sort(candidate_files.begin(), candidate_files.end(), CompareCandidateFile);
|
|
candidate_files.erase(unique(candidate_files.begin(), candidate_files.end()),
|
|
candidate_files.end());
|
|
|
|
std::vector<std::string> old_info_log_files;
|
|
|
|
for (const auto& candidate_file : candidate_files) {
|
|
std::string to_delete = candidate_file.file_name;
|
|
uint32_t path_id = candidate_file.path_id;
|
|
uint64_t number;
|
|
FileType type;
|
|
// Ignore file if we cannot recognize it.
|
|
if (!ParseFileName(to_delete, &number, &type)) {
|
|
continue;
|
|
}
|
|
|
|
bool keep = true;
|
|
switch (type) {
|
|
case kLogFile:
|
|
keep = ((number >= state.log_number) ||
|
|
(number == state.prev_log_number));
|
|
break;
|
|
case kDescriptorFile:
|
|
// Keep my manifest file, and any newer incarnations'
|
|
// (can happen during manifest roll)
|
|
keep = (number >= state.manifest_file_number);
|
|
break;
|
|
case kTableFile:
|
|
keep = (sst_live_map.find(number) != sst_live_map.end());
|
|
break;
|
|
case kTempFile:
|
|
// Any temp files that are currently being written to must
|
|
// be recorded in pending_outputs_, which is inserted into "live".
|
|
// Also, SetCurrentFile creates a temp file when writing out new
|
|
// manifest, which is equal to state.pending_manifest_file_number. We
|
|
// should not delete that file
|
|
keep = (sst_live_map.find(number) != sst_live_map.end()) ||
|
|
(number == state.pending_manifest_file_number);
|
|
break;
|
|
case kInfoLogFile:
|
|
keep = true;
|
|
if (number != 0) {
|
|
old_info_log_files.push_back(to_delete);
|
|
}
|
|
break;
|
|
case kCurrentFile:
|
|
case kDBLockFile:
|
|
case kIdentityFile:
|
|
case kMetaDatabase:
|
|
keep = true;
|
|
break;
|
|
}
|
|
|
|
if (keep) {
|
|
continue;
|
|
}
|
|
|
|
std::string fname;
|
|
if (type == kTableFile) {
|
|
// evict from cache
|
|
TableCache::Evict(table_cache_.get(), number);
|
|
fname = TableFileName(options_.db_paths, number, path_id);
|
|
} else {
|
|
fname =
|
|
((type == kLogFile) ? options_.wal_dir : dbname_) + "/" + to_delete;
|
|
}
|
|
|
|
if (type == kLogFile &&
|
|
(options_.WAL_ttl_seconds > 0 || options_.WAL_size_limit_MB > 0)) {
|
|
auto archived_log_name = ArchivedLogFileName(options_.wal_dir, number);
|
|
// The sync point below is used in (DBTest,TransactionLogIteratorRace)
|
|
TEST_SYNC_POINT("DBImpl::PurgeObsoleteFiles:1");
|
|
Status s = env_->RenameFile(fname, archived_log_name);
|
|
// The sync point below is used in (DBTest,TransactionLogIteratorRace)
|
|
TEST_SYNC_POINT("DBImpl::PurgeObsoleteFiles:2");
|
|
Log(options_.info_log,
|
|
"Move log file %s to %s -- %s\n",
|
|
fname.c_str(), archived_log_name.c_str(), s.ToString().c_str());
|
|
} else {
|
|
Status s = env_->DeleteFile(fname);
|
|
Log(options_.info_log, "Delete %s type=%d #%" PRIu64 " -- %s\n",
|
|
fname.c_str(), type, number, s.ToString().c_str());
|
|
}
|
|
}
|
|
|
|
// Delete old info log files.
|
|
size_t old_info_log_file_count = old_info_log_files.size();
|
|
// NOTE: Currently we only support log purge when options_.db_log_dir is
|
|
// located in `dbname` directory.
|
|
if (old_info_log_file_count >= options_.keep_log_file_num &&
|
|
options_.db_log_dir.empty()) {
|
|
std::sort(old_info_log_files.begin(), old_info_log_files.end());
|
|
size_t end = old_info_log_file_count - options_.keep_log_file_num;
|
|
for (unsigned int i = 0; i <= end; i++) {
|
|
std::string& to_delete = old_info_log_files.at(i);
|
|
Log(options_.info_log, "Delete info log file %s\n", to_delete.c_str());
|
|
Status s = env_->DeleteFile(dbname_ + "/" + to_delete);
|
|
if (!s.ok()) {
|
|
Log(options_.info_log, "Delete info log file %s FAILED -- %s\n",
|
|
to_delete.c_str(), s.ToString().c_str());
|
|
}
|
|
}
|
|
}
|
|
PurgeObsoleteWALFiles();
|
|
LogFlush(options_.info_log);
|
|
}
|
|
|
|
void DBImpl::DeleteObsoleteFiles() {
|
|
mutex_.AssertHeld();
|
|
DeletionState deletion_state;
|
|
FindObsoleteFiles(deletion_state, true);
|
|
if (deletion_state.HaveSomethingToDelete()) {
|
|
PurgeObsoleteFiles(deletion_state);
|
|
}
|
|
}
|
|
|
|
#ifndef ROCKSDB_LITE
|
|
// 1. Go through all archived files and
|
|
// a. if ttl is enabled, delete outdated files
|
|
// b. if archive size limit is enabled, delete empty files,
|
|
// compute file number and size.
|
|
// 2. If size limit is enabled:
|
|
// a. compute how many files should be deleted
|
|
// b. get sorted non-empty archived logs
|
|
// c. delete what should be deleted
|
|
void DBImpl::PurgeObsoleteWALFiles() {
|
|
bool const ttl_enabled = options_.WAL_ttl_seconds > 0;
|
|
bool const size_limit_enabled = options_.WAL_size_limit_MB > 0;
|
|
if (!ttl_enabled && !size_limit_enabled) {
|
|
return;
|
|
}
|
|
|
|
int64_t current_time;
|
|
Status s = env_->GetCurrentTime(¤t_time);
|
|
if (!s.ok()) {
|
|
Log(options_.info_log, "Can't get current time: %s", s.ToString().c_str());
|
|
assert(false);
|
|
return;
|
|
}
|
|
uint64_t const now_seconds = static_cast<uint64_t>(current_time);
|
|
uint64_t const time_to_check = (ttl_enabled && !size_limit_enabled) ?
|
|
options_.WAL_ttl_seconds / 2 : default_interval_to_delete_obsolete_WAL_;
|
|
|
|
if (purge_wal_files_last_run_ + time_to_check > now_seconds) {
|
|
return;
|
|
}
|
|
|
|
purge_wal_files_last_run_ = now_seconds;
|
|
|
|
std::string archival_dir = ArchivalDirectory(options_.wal_dir);
|
|
std::vector<std::string> files;
|
|
s = env_->GetChildren(archival_dir, &files);
|
|
if (!s.ok()) {
|
|
Log(options_.info_log, "Can't get archive files: %s", s.ToString().c_str());
|
|
assert(false);
|
|
return;
|
|
}
|
|
|
|
size_t log_files_num = 0;
|
|
uint64_t log_file_size = 0;
|
|
|
|
for (auto& f : files) {
|
|
uint64_t number;
|
|
FileType type;
|
|
if (ParseFileName(f, &number, &type) && type == kLogFile) {
|
|
std::string const file_path = archival_dir + "/" + f;
|
|
if (ttl_enabled) {
|
|
uint64_t file_m_time;
|
|
Status const s = env_->GetFileModificationTime(file_path,
|
|
&file_m_time);
|
|
if (!s.ok()) {
|
|
Log(options_.info_log, "Can't get file mod time: %s: %s",
|
|
file_path.c_str(), s.ToString().c_str());
|
|
continue;
|
|
}
|
|
if (now_seconds - file_m_time > options_.WAL_ttl_seconds) {
|
|
Status const s = env_->DeleteFile(file_path);
|
|
if (!s.ok()) {
|
|
Log(options_.info_log, "Can't delete file: %s: %s",
|
|
file_path.c_str(), s.ToString().c_str());
|
|
continue;
|
|
} else {
|
|
MutexLock l(&read_first_record_cache_mutex_);
|
|
read_first_record_cache_.erase(number);
|
|
}
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if (size_limit_enabled) {
|
|
uint64_t file_size;
|
|
Status const s = env_->GetFileSize(file_path, &file_size);
|
|
if (!s.ok()) {
|
|
Log(options_.info_log, "Can't get file size: %s: %s",
|
|
file_path.c_str(), s.ToString().c_str());
|
|
return;
|
|
} else {
|
|
if (file_size > 0) {
|
|
log_file_size = std::max(log_file_size, file_size);
|
|
++log_files_num;
|
|
} else {
|
|
Status s = env_->DeleteFile(file_path);
|
|
if (!s.ok()) {
|
|
Log(options_.info_log, "Can't delete file: %s: %s",
|
|
file_path.c_str(), s.ToString().c_str());
|
|
continue;
|
|
} else {
|
|
MutexLock l(&read_first_record_cache_mutex_);
|
|
read_first_record_cache_.erase(number);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (0 == log_files_num || !size_limit_enabled) {
|
|
return;
|
|
}
|
|
|
|
size_t const files_keep_num = options_.WAL_size_limit_MB *
|
|
1024 * 1024 / log_file_size;
|
|
if (log_files_num <= files_keep_num) {
|
|
return;
|
|
}
|
|
|
|
size_t files_del_num = log_files_num - files_keep_num;
|
|
VectorLogPtr archived_logs;
|
|
GetSortedWalsOfType(archival_dir, archived_logs, kArchivedLogFile);
|
|
|
|
if (files_del_num > archived_logs.size()) {
|
|
Log(options_.info_log, "Trying to delete more archived log files than "
|
|
"exist. Deleting all");
|
|
files_del_num = archived_logs.size();
|
|
}
|
|
|
|
for (size_t i = 0; i < files_del_num; ++i) {
|
|
std::string const file_path = archived_logs[i]->PathName();
|
|
Status const s = DeleteFile(file_path);
|
|
if (!s.ok()) {
|
|
Log(options_.info_log, "Can't delete file: %s: %s",
|
|
file_path.c_str(), s.ToString().c_str());
|
|
continue;
|
|
} else {
|
|
MutexLock l(&read_first_record_cache_mutex_);
|
|
read_first_record_cache_.erase(archived_logs[i]->LogNumber());
|
|
}
|
|
}
|
|
}
|
|
|
|
namespace {
|
|
struct CompareLogByPointer {
|
|
bool operator()(const unique_ptr<LogFile>& a, const unique_ptr<LogFile>& b) {
|
|
LogFileImpl* a_impl = dynamic_cast<LogFileImpl*>(a.get());
|
|
LogFileImpl* b_impl = dynamic_cast<LogFileImpl*>(b.get());
|
|
return *a_impl < *b_impl;
|
|
}
|
|
};
|
|
}
|
|
|
|
Status DBImpl::GetSortedWalsOfType(const std::string& path,
|
|
VectorLogPtr& log_files,
|
|
WalFileType log_type) {
|
|
std::vector<std::string> all_files;
|
|
const Status status = env_->GetChildren(path, &all_files);
|
|
if (!status.ok()) {
|
|
return status;
|
|
}
|
|
log_files.reserve(all_files.size());
|
|
for (const auto& f : all_files) {
|
|
uint64_t number;
|
|
FileType type;
|
|
if (ParseFileName(f, &number, &type) && type == kLogFile) {
|
|
SequenceNumber sequence;
|
|
Status s = ReadFirstRecord(log_type, number, &sequence);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
if (sequence == 0) {
|
|
// empty file
|
|
continue;
|
|
}
|
|
|
|
// Reproduce the race condition where a log file is moved
|
|
// to archived dir, between these two sync points, used in
|
|
// (DBTest,TransactionLogIteratorRace)
|
|
TEST_SYNC_POINT("DBImpl::GetSortedWalsOfType:1");
|
|
TEST_SYNC_POINT("DBImpl::GetSortedWalsOfType:2");
|
|
|
|
uint64_t size_bytes;
|
|
s = env_->GetFileSize(LogFileName(path, number), &size_bytes);
|
|
// re-try in case the alive log file has been moved to archive.
|
|
if (!s.ok() && log_type == kAliveLogFile &&
|
|
env_->FileExists(ArchivedLogFileName(path, number))) {
|
|
s = env_->GetFileSize(ArchivedLogFileName(path, number), &size_bytes);
|
|
}
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
log_files.push_back(std::move(unique_ptr<LogFile>(
|
|
new LogFileImpl(number, log_type, sequence, size_bytes))));
|
|
}
|
|
}
|
|
CompareLogByPointer compare_log_files;
|
|
std::sort(log_files.begin(), log_files.end(), compare_log_files);
|
|
return status;
|
|
}
|
|
|
|
Status DBImpl::RetainProbableWalFiles(VectorLogPtr& all_logs,
|
|
const SequenceNumber target) {
|
|
int64_t start = 0; // signed to avoid overflow when target is < first file.
|
|
int64_t end = static_cast<int64_t>(all_logs.size()) - 1;
|
|
// Binary Search. avoid opening all files.
|
|
while (end >= start) {
|
|
int64_t mid = start + (end - start) / 2; // Avoid overflow.
|
|
SequenceNumber current_seq_num = all_logs.at(mid)->StartSequence();
|
|
if (current_seq_num == target) {
|
|
end = mid;
|
|
break;
|
|
} else if (current_seq_num < target) {
|
|
start = mid + 1;
|
|
} else {
|
|
end = mid - 1;
|
|
}
|
|
}
|
|
// end could be -ve.
|
|
size_t start_index = std::max(static_cast<int64_t>(0), end);
|
|
// The last wal file is always included
|
|
all_logs.erase(all_logs.begin(), all_logs.begin() + start_index);
|
|
return Status::OK();
|
|
}
|
|
|
|
Status DBImpl::ReadFirstRecord(const WalFileType type, const uint64_t number,
|
|
SequenceNumber* sequence) {
|
|
if (type != kAliveLogFile && type != kArchivedLogFile) {
|
|
return Status::NotSupported("File Type Not Known " + std::to_string(type));
|
|
}
|
|
{
|
|
MutexLock l(&read_first_record_cache_mutex_);
|
|
auto itr = read_first_record_cache_.find(number);
|
|
if (itr != read_first_record_cache_.end()) {
|
|
*sequence = itr->second;
|
|
return Status::OK();
|
|
}
|
|
}
|
|
Status s;
|
|
if (type == kAliveLogFile) {
|
|
std::string fname = LogFileName(options_.wal_dir, number);
|
|
s = ReadFirstLine(fname, sequence);
|
|
if (env_->FileExists(fname) && !s.ok()) {
|
|
// return any error that is not caused by non-existing file
|
|
return s;
|
|
}
|
|
}
|
|
|
|
if (type == kArchivedLogFile || !s.ok()) {
|
|
// check if the file got moved to archive.
|
|
std::string archived_file = ArchivedLogFileName(options_.wal_dir, number);
|
|
s = ReadFirstLine(archived_file, sequence);
|
|
}
|
|
|
|
if (s.ok() && *sequence != 0) {
|
|
MutexLock l(&read_first_record_cache_mutex_);
|
|
read_first_record_cache_.insert({number, *sequence});
|
|
}
|
|
return s;
|
|
}
|
|
|
|
// the function returns status.ok() and sequence == 0 if the file exists, but is
|
|
// empty
|
|
Status DBImpl::ReadFirstLine(const std::string& fname,
|
|
SequenceNumber* sequence) {
|
|
struct LogReporter : public log::Reader::Reporter {
|
|
Env* env;
|
|
Logger* info_log;
|
|
const char* fname;
|
|
|
|
Status* status;
|
|
bool ignore_error; // true if options_.paranoid_checks==false
|
|
virtual void Corruption(size_t bytes, const Status& s) {
|
|
Log(info_log, "%s%s: dropping %d bytes; %s",
|
|
(this->ignore_error ? "(ignoring error) " : ""), fname,
|
|
static_cast<int>(bytes), s.ToString().c_str());
|
|
if (this->status->ok()) {
|
|
// only keep the first error
|
|
*this->status = s;
|
|
}
|
|
}
|
|
};
|
|
|
|
unique_ptr<SequentialFile> file;
|
|
Status status = env_->NewSequentialFile(fname, &file, storage_options_);
|
|
|
|
if (!status.ok()) {
|
|
return status;
|
|
}
|
|
|
|
LogReporter reporter;
|
|
reporter.env = env_;
|
|
reporter.info_log = options_.info_log.get();
|
|
reporter.fname = fname.c_str();
|
|
reporter.status = &status;
|
|
reporter.ignore_error = !options_.paranoid_checks;
|
|
log::Reader reader(std::move(file), &reporter, true /*checksum*/,
|
|
0 /*initial_offset*/);
|
|
std::string scratch;
|
|
Slice record;
|
|
|
|
if (reader.ReadRecord(&record, &scratch) &&
|
|
(status.ok() || !options_.paranoid_checks)) {
|
|
if (record.size() < 12) {
|
|
reporter.Corruption(record.size(),
|
|
Status::Corruption("log record too small"));
|
|
// TODO read record's till the first no corrupt entry?
|
|
} else {
|
|
WriteBatch batch;
|
|
WriteBatchInternal::SetContents(&batch, record);
|
|
*sequence = WriteBatchInternal::Sequence(&batch);
|
|
return Status::OK();
|
|
}
|
|
}
|
|
|
|
// ReadRecord returns false on EOF, which means that the log file is empty. we
|
|
// return status.ok() in that case and set sequence number to 0
|
|
*sequence = 0;
|
|
return status;
|
|
}
|
|
|
|
#endif // ROCKSDB_LITE
|
|
|
|
Status DBImpl::Recover(
|
|
const std::vector<ColumnFamilyDescriptor>& column_families, bool read_only,
|
|
bool error_if_log_file_exist) {
|
|
mutex_.AssertHeld();
|
|
|
|
bool is_new_db = false;
|
|
assert(db_lock_ == nullptr);
|
|
if (!read_only) {
|
|
// We call CreateDirIfMissing() as the directory may already exist (if we
|
|
// are reopening a DB), when this happens we don't want creating the
|
|
// directory to cause an error. However, we need to check if creating the
|
|
// directory fails or else we may get an obscure message about the lock
|
|
// file not existing. One real-world example of this occurring is if
|
|
// env->CreateDirIfMissing() doesn't create intermediate directories, e.g.
|
|
// when dbname_ is "dir/db" but when "dir" doesn't exist.
|
|
Status s = env_->CreateDirIfMissing(dbname_);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
for (auto& db_path : options_.db_paths) {
|
|
s = env_->CreateDirIfMissing(db_path.path);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
}
|
|
|
|
s = env_->NewDirectory(dbname_, &db_directory_);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
s = env_->LockFile(LockFileName(dbname_), &db_lock_);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
if (!env_->FileExists(CurrentFileName(dbname_))) {
|
|
if (options_.create_if_missing) {
|
|
s = NewDB();
|
|
is_new_db = true;
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
} else {
|
|
return Status::InvalidArgument(
|
|
dbname_, "does not exist (create_if_missing is false)");
|
|
}
|
|
} else {
|
|
if (options_.error_if_exists) {
|
|
return Status::InvalidArgument(
|
|
dbname_, "exists (error_if_exists is true)");
|
|
}
|
|
}
|
|
// Check for the IDENTITY file and create it if not there
|
|
if (!env_->FileExists(IdentityFileName(dbname_))) {
|
|
s = SetIdentityFile(env_, dbname_);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
}
|
|
}
|
|
|
|
Status s = versions_->Recover(column_families, read_only);
|
|
if (options_.paranoid_checks && s.ok()) {
|
|
s = CheckConsistency();
|
|
}
|
|
if (s.ok()) {
|
|
SequenceNumber max_sequence(0);
|
|
default_cf_handle_ = new ColumnFamilyHandleImpl(
|
|
versions_->GetColumnFamilySet()->GetDefault(), this, &mutex_);
|
|
default_cf_internal_stats_ = default_cf_handle_->cfd()->internal_stats();
|
|
single_column_family_mode_ =
|
|
versions_->GetColumnFamilySet()->NumberOfColumnFamilies() == 1;
|
|
|
|
// Recover from all newer log files than the ones named in the
|
|
// descriptor (new log files may have been added by the previous
|
|
// incarnation without registering them in the descriptor).
|
|
//
|
|
// Note that PrevLogNumber() is no longer used, but we pay
|
|
// attention to it in case we are recovering a database
|
|
// produced by an older version of rocksdb.
|
|
const uint64_t min_log = versions_->MinLogNumber();
|
|
const uint64_t prev_log = versions_->PrevLogNumber();
|
|
std::vector<std::string> filenames;
|
|
s = env_->GetChildren(options_.wal_dir, &filenames);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
std::vector<uint64_t> logs;
|
|
for (size_t i = 0; i < filenames.size(); i++) {
|
|
uint64_t number;
|
|
FileType type;
|
|
if (ParseFileName(filenames[i], &number, &type) && type == kLogFile) {
|
|
if (is_new_db) {
|
|
return Status::Corruption(
|
|
"While creating a new Db, wal_dir contains "
|
|
"existing log file: ",
|
|
filenames[i]);
|
|
} else if ((number >= min_log) || (number == prev_log)) {
|
|
logs.push_back(number);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (logs.size() > 0 && error_if_log_file_exist) {
|
|
return Status::Corruption(""
|
|
"The db was opened in readonly mode with error_if_log_file_exist"
|
|
"flag but a log file already exists");
|
|
}
|
|
|
|
// Recover in the order in which the logs were generated
|
|
std::sort(logs.begin(), logs.end());
|
|
for (const auto& log : logs) {
|
|
// The previous incarnation may not have written any MANIFEST
|
|
// records after allocating this log number. So we manually
|
|
// update the file number allocation counter in VersionSet.
|
|
versions_->MarkFileNumberUsed(log);
|
|
s = RecoverLogFile(log, &max_sequence, read_only);
|
|
}
|
|
SetTickerCount(stats_, SEQUENCE_NUMBER, versions_->LastSequence());
|
|
}
|
|
|
|
for (auto cfd : *versions_->GetColumnFamilySet()) {
|
|
max_total_in_memory_state_ += cfd->options()->write_buffer_size *
|
|
cfd->options()->max_write_buffer_number;
|
|
}
|
|
|
|
return s;
|
|
}
|
|
|
|
Status DBImpl::RecoverLogFile(uint64_t log_number, SequenceNumber* max_sequence,
|
|
bool read_only) {
|
|
struct LogReporter : public log::Reader::Reporter {
|
|
Env* env;
|
|
Logger* info_log;
|
|
const char* fname;
|
|
Status* status; // nullptr if options_.paranoid_checks==false or
|
|
// options_.skip_log_error_on_recovery==true
|
|
virtual void Corruption(size_t bytes, const Status& s) {
|
|
Log(info_log, "%s%s: dropping %d bytes; %s",
|
|
(this->status == nullptr ? "(ignoring error) " : ""),
|
|
fname, static_cast<int>(bytes), s.ToString().c_str());
|
|
if (this->status != nullptr && this->status->ok()) *this->status = s;
|
|
}
|
|
};
|
|
|
|
mutex_.AssertHeld();
|
|
|
|
std::unordered_map<int, VersionEdit> version_edits;
|
|
// no need to refcount because iteration is under mutex
|
|
for (auto cfd : *versions_->GetColumnFamilySet()) {
|
|
VersionEdit edit;
|
|
edit.SetColumnFamily(cfd->GetID());
|
|
version_edits.insert({cfd->GetID(), edit});
|
|
}
|
|
|
|
// Open the log file
|
|
std::string fname = LogFileName(options_.wal_dir, log_number);
|
|
unique_ptr<SequentialFile> file;
|
|
Status status = env_->NewSequentialFile(fname, &file, storage_options_);
|
|
if (!status.ok()) {
|
|
MaybeIgnoreError(&status);
|
|
return status;
|
|
}
|
|
|
|
// Create the log reader.
|
|
LogReporter reporter;
|
|
reporter.env = env_;
|
|
reporter.info_log = options_.info_log.get();
|
|
reporter.fname = fname.c_str();
|
|
reporter.status = (options_.paranoid_checks &&
|
|
!options_.skip_log_error_on_recovery ? &status : nullptr);
|
|
// We intentially make log::Reader do checksumming even if
|
|
// paranoid_checks==false so that corruptions cause entire commits
|
|
// to be skipped instead of propagating bad information (like overly
|
|
// large sequence numbers).
|
|
log::Reader reader(std::move(file), &reporter, true/*checksum*/,
|
|
0/*initial_offset*/);
|
|
Log(options_.info_log, "Recovering log #%" PRIu64 "", log_number);
|
|
|
|
// Read all the records and add to a memtable
|
|
std::string scratch;
|
|
Slice record;
|
|
WriteBatch batch;
|
|
while (reader.ReadRecord(&record, &scratch)) {
|
|
if (record.size() < 12) {
|
|
reporter.Corruption(
|
|
record.size(), Status::Corruption("log record too small"));
|
|
continue;
|
|
}
|
|
WriteBatchInternal::SetContents(&batch, record);
|
|
|
|
status = WriteBatchInternal::InsertInto(
|
|
&batch, column_family_memtables_.get(), true, log_number);
|
|
|
|
MaybeIgnoreError(&status);
|
|
if (!status.ok()) {
|
|
return status;
|
|
}
|
|
const SequenceNumber last_seq =
|
|
WriteBatchInternal::Sequence(&batch) +
|
|
WriteBatchInternal::Count(&batch) - 1;
|
|
if (last_seq > *max_sequence) {
|
|
*max_sequence = last_seq;
|
|
}
|
|
|
|
if (!read_only) {
|
|
// no need to refcount since client still doesn't have access
|
|
// to the DB and can not drop column families while we iterate
|
|
for (auto cfd : *versions_->GetColumnFamilySet()) {
|
|
if (cfd->mem()->ShouldFlush()) {
|
|
// If this asserts, it means that InsertInto failed in
|
|
// filtering updates to already-flushed column families
|
|
assert(cfd->GetLogNumber() <= log_number);
|
|
auto iter = version_edits.find(cfd->GetID());
|
|
assert(iter != version_edits.end());
|
|
VersionEdit* edit = &iter->second;
|
|
status = WriteLevel0TableForRecovery(cfd, cfd->mem(), edit);
|
|
// we still want to clear the memtable, even if the recovery failed
|
|
cfd->CreateNewMemtable();
|
|
if (!status.ok()) {
|
|
// Reflect errors immediately so that conditions like full
|
|
// file-systems cause the DB::Open() to fail.
|
|
return status;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (versions_->LastSequence() < *max_sequence) {
|
|
versions_->SetLastSequence(*max_sequence);
|
|
}
|
|
|
|
if (!read_only) {
|
|
// no need to refcount since client still doesn't have access
|
|
// to the DB and can not drop column families while we iterate
|
|
for (auto cfd : *versions_->GetColumnFamilySet()) {
|
|
auto iter = version_edits.find(cfd->GetID());
|
|
assert(iter != version_edits.end());
|
|
VersionEdit* edit = &iter->second;
|
|
|
|
if (cfd->GetLogNumber() > log_number) {
|
|
// Column family cfd has already flushed the data
|
|
// from log_number. Memtable has to be empty because
|
|
// we filter the updates based on log_number
|
|
// (in WriteBatch::InsertInto)
|
|
assert(cfd->mem()->GetFirstSequenceNumber() == 0);
|
|
assert(edit->NumEntries() == 0);
|
|
continue;
|
|
}
|
|
|
|
// flush the final memtable (if non-empty)
|
|
if (cfd->mem()->GetFirstSequenceNumber() != 0) {
|
|
status = WriteLevel0TableForRecovery(cfd, cfd->mem(), edit);
|
|
}
|
|
// we still want to clear the memtable, even if the recovery failed
|
|
cfd->CreateNewMemtable();
|
|
if (!status.ok()) {
|
|
return status;
|
|
}
|
|
|
|
// write MANIFEST with update
|
|
// writing log number in the manifest means that any log file
|
|
// with number strongly less than (log_number + 1) is already
|
|
// recovered and should be ignored on next reincarnation.
|
|
// Since we already recovered log_number, we want all logs
|
|
// with numbers `<= log_number` (includes this one) to be ignored
|
|
edit->SetLogNumber(log_number + 1);
|
|
// we must mark the next log number as used, even though it's
|
|
// not actually used. that is because VersionSet assumes
|
|
// VersionSet::next_file_number_ always to be strictly greater than any
|
|
// log number
|
|
versions_->MarkFileNumberUsed(log_number + 1);
|
|
status = versions_->LogAndApply(cfd, edit, &mutex_);
|
|
if (!status.ok()) {
|
|
return status;
|
|
}
|
|
}
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
Status DBImpl::WriteLevel0TableForRecovery(ColumnFamilyData* cfd, MemTable* mem,
|
|
VersionEdit* edit) {
|
|
mutex_.AssertHeld();
|
|
const uint64_t start_micros = env_->NowMicros();
|
|
FileMetaData meta;
|
|
meta.fd = FileDescriptor(versions_->NewFileNumber(), 0, 0);
|
|
pending_outputs_[meta.fd.GetNumber()] = 0; // path 0 for level 0 file.
|
|
Iterator* iter = mem->NewIterator(ReadOptions(), true);
|
|
const SequenceNumber newest_snapshot = snapshots_.GetNewest();
|
|
const SequenceNumber earliest_seqno_in_memtable =
|
|
mem->GetFirstSequenceNumber();
|
|
Log(options_.info_log, "[%s] Level-0 table #%" PRIu64 ": started",
|
|
cfd->GetName().c_str(), meta.fd.GetNumber());
|
|
|
|
Status s;
|
|
{
|
|
mutex_.Unlock();
|
|
s = BuildTable(dbname_, env_, *cfd->options(), storage_options_,
|
|
cfd->table_cache(), iter, &meta, cfd->internal_comparator(),
|
|
newest_snapshot, earliest_seqno_in_memtable,
|
|
GetCompressionFlush(*cfd->options()), Env::IO_HIGH);
|
|
LogFlush(options_.info_log);
|
|
mutex_.Lock();
|
|
}
|
|
|
|
Log(options_.info_log,
|
|
"[%s] Level-0 table #%" PRIu64 ": %" PRIu64 " bytes %s",
|
|
cfd->GetName().c_str(), meta.fd.GetNumber(), meta.fd.GetFileSize(),
|
|
s.ToString().c_str());
|
|
delete iter;
|
|
|
|
pending_outputs_.erase(meta.fd.GetNumber());
|
|
|
|
// Note that if file_size is zero, the file has been deleted and
|
|
// should not be added to the manifest.
|
|
int level = 0;
|
|
if (s.ok() && meta.fd.GetFileSize() > 0) {
|
|
edit->AddFile(level, meta.fd.GetNumber(), meta.fd.GetPathId(),
|
|
meta.fd.GetFileSize(), meta.smallest, meta.largest,
|
|
meta.smallest_seqno, meta.largest_seqno);
|
|
}
|
|
|
|
InternalStats::CompactionStats stats(1);
|
|
stats.micros = env_->NowMicros() - start_micros;
|
|
stats.bytes_written = meta.fd.GetFileSize();
|
|
stats.files_out_levelnp1 = 1;
|
|
cfd->internal_stats()->AddCompactionStats(level, stats);
|
|
cfd->internal_stats()->AddCFStats(
|
|
InternalStats::BYTES_FLUSHED, meta.fd.GetFileSize());
|
|
RecordTick(stats_, COMPACT_WRITE_BYTES, meta.fd.GetFileSize());
|
|
return s;
|
|
}
|
|
|
|
Status DBImpl::WriteLevel0Table(ColumnFamilyData* cfd,
|
|
autovector<MemTable*>& mems, VersionEdit* edit,
|
|
uint64_t* filenumber, LogBuffer* log_buffer) {
|
|
mutex_.AssertHeld();
|
|
const uint64_t start_micros = env_->NowMicros();
|
|
FileMetaData meta;
|
|
|
|
meta.fd = FileDescriptor(versions_->NewFileNumber(), 0, 0);
|
|
*filenumber = meta.fd.GetNumber();
|
|
pending_outputs_[meta.fd.GetNumber()] = 0; // path 0 for level 0 file.
|
|
|
|
const SequenceNumber newest_snapshot = snapshots_.GetNewest();
|
|
const SequenceNumber earliest_seqno_in_memtable =
|
|
mems[0]->GetFirstSequenceNumber();
|
|
Version* base = cfd->current();
|
|
base->Ref(); // it is likely that we do not need this reference
|
|
Status s;
|
|
{
|
|
mutex_.Unlock();
|
|
log_buffer->FlushBufferToLog();
|
|
std::vector<Iterator*> memtables;
|
|
for (MemTable* m : mems) {
|
|
Log(options_.info_log,
|
|
"[%s] Flushing memtable with next log file: %" PRIu64 "\n",
|
|
cfd->GetName().c_str(), m->GetNextLogNumber());
|
|
memtables.push_back(m->NewIterator(ReadOptions(), true));
|
|
}
|
|
Iterator* iter = NewMergingIterator(&cfd->internal_comparator(),
|
|
&memtables[0], memtables.size());
|
|
Log(options_.info_log, "[%s] Level-0 flush table #%" PRIu64 ": started",
|
|
cfd->GetName().c_str(), meta.fd.GetNumber());
|
|
|
|
s = BuildTable(dbname_, env_, *cfd->options(), storage_options_,
|
|
cfd->table_cache(), iter, &meta, cfd->internal_comparator(),
|
|
newest_snapshot, earliest_seqno_in_memtable,
|
|
GetCompressionFlush(*cfd->options()), Env::IO_HIGH);
|
|
LogFlush(options_.info_log);
|
|
delete iter;
|
|
Log(options_.info_log,
|
|
"[%s] Level-0 flush table #%" PRIu64 ": %" PRIu64 " bytes %s",
|
|
cfd->GetName().c_str(), meta.fd.GetNumber(), meta.fd.GetFileSize(),
|
|
s.ToString().c_str());
|
|
|
|
if (!options_.disableDataSync) {
|
|
db_directory_->Fsync();
|
|
}
|
|
mutex_.Lock();
|
|
}
|
|
base->Unref();
|
|
|
|
// re-acquire the most current version
|
|
base = cfd->current();
|
|
|
|
// There could be multiple threads writing to its own level-0 file.
|
|
// The pending_outputs cannot be cleared here, otherwise this newly
|
|
// created file might not be considered as a live-file by another
|
|
// compaction thread that is concurrently deleting obselete files.
|
|
// The pending_outputs can be cleared only after the new version is
|
|
// committed so that other threads can recognize this file as a
|
|
// valid one.
|
|
// pending_outputs_.erase(meta.number);
|
|
|
|
// Note that if file_size is zero, the file has been deleted and
|
|
// should not be added to the manifest.
|
|
int level = 0;
|
|
if (s.ok() && meta.fd.GetFileSize() > 0) {
|
|
const Slice min_user_key = meta.smallest.user_key();
|
|
const Slice max_user_key = meta.largest.user_key();
|
|
// if we have more than 1 background thread, then we cannot
|
|
// insert files directly into higher levels because some other
|
|
// threads could be concurrently producing compacted files for
|
|
// that key range.
|
|
if (base != nullptr && options_.max_background_compactions <= 1 &&
|
|
cfd->options()->compaction_style == kCompactionStyleLevel) {
|
|
level = base->PickLevelForMemTableOutput(min_user_key, max_user_key);
|
|
}
|
|
edit->AddFile(level, meta.fd.GetNumber(), meta.fd.GetPathId(),
|
|
meta.fd.GetFileSize(), meta.smallest, meta.largest,
|
|
meta.smallest_seqno, meta.largest_seqno);
|
|
}
|
|
|
|
InternalStats::CompactionStats stats(1);
|
|
stats.micros = env_->NowMicros() - start_micros;
|
|
stats.bytes_written = meta.fd.GetFileSize();
|
|
cfd->internal_stats()->AddCompactionStats(level, stats);
|
|
cfd->internal_stats()->AddCFStats(
|
|
InternalStats::BYTES_FLUSHED, meta.fd.GetFileSize());
|
|
RecordTick(stats_, COMPACT_WRITE_BYTES, meta.fd.GetFileSize());
|
|
return s;
|
|
}
|
|
|
|
Status DBImpl::FlushMemTableToOutputFile(ColumnFamilyData* cfd,
|
|
bool* madeProgress,
|
|
DeletionState& deletion_state,
|
|
LogBuffer* log_buffer) {
|
|
mutex_.AssertHeld();
|
|
assert(cfd->imm()->size() != 0);
|
|
assert(cfd->imm()->IsFlushPending());
|
|
|
|
// Save the contents of the earliest memtable as a new Table
|
|
uint64_t file_number;
|
|
autovector<MemTable*> mems;
|
|
cfd->imm()->PickMemtablesToFlush(&mems);
|
|
if (mems.empty()) {
|
|
LogToBuffer(log_buffer, "[%s] Nothing in memtable to flush",
|
|
cfd->GetName().c_str());
|
|
return Status::OK();
|
|
}
|
|
|
|
// record the logfile_number_ before we release the mutex
|
|
// entries mems are (implicitly) sorted in ascending order by their created
|
|
// time. We will use the first memtable's `edit` to keep the meta info for
|
|
// this flush.
|
|
MemTable* m = mems[0];
|
|
VersionEdit* edit = m->GetEdits();
|
|
edit->SetPrevLogNumber(0);
|
|
// SetLogNumber(log_num) indicates logs with number smaller than log_num
|
|
// will no longer be picked up for recovery.
|
|
edit->SetLogNumber(mems.back()->GetNextLogNumber());
|
|
edit->SetColumnFamily(cfd->GetID());
|
|
|
|
// This will release and re-acquire the mutex.
|
|
Status s = WriteLevel0Table(cfd, mems, edit, &file_number, log_buffer);
|
|
|
|
if (s.ok() && shutting_down_.Acquire_Load() && cfd->IsDropped()) {
|
|
s = Status::ShutdownInProgress(
|
|
"Database shutdown or Column family drop during flush");
|
|
}
|
|
|
|
if (!s.ok()) {
|
|
cfd->imm()->RollbackMemtableFlush(mems, file_number, &pending_outputs_);
|
|
} else {
|
|
// Replace immutable memtable with the generated Table
|
|
s = cfd->imm()->InstallMemtableFlushResults(
|
|
cfd, mems, versions_.get(), &mutex_, options_.info_log.get(),
|
|
file_number, &pending_outputs_, &deletion_state.memtables_to_free,
|
|
db_directory_.get(), log_buffer);
|
|
}
|
|
|
|
if (s.ok()) {
|
|
InstallSuperVersion(cfd, deletion_state);
|
|
if (madeProgress) {
|
|
*madeProgress = 1;
|
|
}
|
|
Version::LevelSummaryStorage tmp;
|
|
LogToBuffer(log_buffer, "[%s] Level summary: %s\n", cfd->GetName().c_str(),
|
|
cfd->current()->LevelSummary(&tmp));
|
|
|
|
if (disable_delete_obsolete_files_ == 0) {
|
|
// add to deletion state
|
|
while (alive_log_files_.size() &&
|
|
alive_log_files_.begin()->number < versions_->MinLogNumber()) {
|
|
const auto& earliest = *alive_log_files_.begin();
|
|
deletion_state.log_delete_files.push_back(earliest.number);
|
|
total_log_size_ -= earliest.size;
|
|
alive_log_files_.pop_front();
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!s.ok() && !s.IsShutdownInProgress() && options_.paranoid_checks &&
|
|
bg_error_.ok()) {
|
|
// if a bad error happened (not ShutdownInProgress) and paranoid_checks is
|
|
// true, mark DB read-only
|
|
bg_error_ = s;
|
|
}
|
|
RecordFlushIOStats();
|
|
return s;
|
|
}
|
|
|
|
Status DBImpl::CompactRange(ColumnFamilyHandle* column_family,
|
|
const Slice* begin, const Slice* end,
|
|
bool reduce_level, int target_level,
|
|
uint32_t target_path_id) {
|
|
if (target_path_id >= options_.db_paths.size()) {
|
|
return Status::InvalidArgument("Invalid target path ID");
|
|
}
|
|
|
|
auto cfh = reinterpret_cast<ColumnFamilyHandleImpl*>(column_family);
|
|
auto cfd = cfh->cfd();
|
|
|
|
Status s = FlushMemTable(cfd, FlushOptions());
|
|
if (!s.ok()) {
|
|
LogFlush(options_.info_log);
|
|
return s;
|
|
}
|
|
|
|
int max_level_with_files = 0;
|
|
{
|
|
MutexLock l(&mutex_);
|
|
Version* base = cfd->current();
|
|
for (int level = 1; level < cfd->NumberLevels(); level++) {
|
|
if (base->OverlapInLevel(level, begin, end)) {
|
|
max_level_with_files = level;
|
|
}
|
|
}
|
|
}
|
|
for (int level = 0; level <= max_level_with_files; level++) {
|
|
// in case the compaction is unversal or if we're compacting the
|
|
// bottom-most level, the output level will be the same as input one.
|
|
// level 0 can never be the bottommost level (i.e. if all files are in level
|
|
// 0, we will compact to level 1)
|
|
if (cfd->options()->compaction_style == kCompactionStyleUniversal ||
|
|
cfd->options()->compaction_style == kCompactionStyleFIFO ||
|
|
(level == max_level_with_files && level > 0)) {
|
|
s = RunManualCompaction(cfd, level, level, target_path_id, begin, end);
|
|
} else {
|
|
s = RunManualCompaction(cfd, level, level + 1, target_path_id, begin,
|
|
end);
|
|
}
|
|
if (!s.ok()) {
|
|
LogFlush(options_.info_log);
|
|
return s;
|
|
}
|
|
}
|
|
|
|
if (reduce_level) {
|
|
s = ReFitLevel(cfd, max_level_with_files, target_level);
|
|
}
|
|
LogFlush(options_.info_log);
|
|
|
|
return s;
|
|
}
|
|
|
|
// return the same level if it cannot be moved
|
|
int DBImpl::FindMinimumEmptyLevelFitting(ColumnFamilyData* cfd, int level) {
|
|
mutex_.AssertHeld();
|
|
Version* current = cfd->current();
|
|
int minimum_level = level;
|
|
for (int i = level - 1; i > 0; --i) {
|
|
// stop if level i is not empty
|
|
if (current->NumLevelFiles(i) > 0) break;
|
|
// stop if level i is too small (cannot fit the level files)
|
|
if (cfd->compaction_picker()->MaxBytesForLevel(i) <
|
|
current->NumLevelBytes(level)) {
|
|
break;
|
|
}
|
|
|
|
minimum_level = i;
|
|
}
|
|
return minimum_level;
|
|
}
|
|
|
|
Status DBImpl::ReFitLevel(ColumnFamilyData* cfd, int level, int target_level) {
|
|
assert(level < cfd->NumberLevels());
|
|
|
|
SuperVersion* superversion_to_free = nullptr;
|
|
SuperVersion* new_superversion = new SuperVersion();
|
|
|
|
mutex_.Lock();
|
|
|
|
// only allow one thread refitting
|
|
if (refitting_level_) {
|
|
mutex_.Unlock();
|
|
Log(options_.info_log, "ReFitLevel: another thread is refitting");
|
|
delete new_superversion;
|
|
return Status::NotSupported("another thread is refitting");
|
|
}
|
|
refitting_level_ = true;
|
|
|
|
// wait for all background threads to stop
|
|
bg_work_gate_closed_ = true;
|
|
while (bg_compaction_scheduled_ > 0 || bg_flush_scheduled_) {
|
|
Log(options_.info_log,
|
|
"RefitLevel: waiting for background threads to stop: %d %d",
|
|
bg_compaction_scheduled_, bg_flush_scheduled_);
|
|
bg_cv_.Wait();
|
|
}
|
|
|
|
// move to a smaller level
|
|
int to_level = target_level;
|
|
if (target_level < 0) {
|
|
to_level = FindMinimumEmptyLevelFitting(cfd, level);
|
|
}
|
|
|
|
assert(to_level <= level);
|
|
|
|
Status status;
|
|
if (to_level < level) {
|
|
Log(options_.info_log, "[%s] Before refitting:\n%s", cfd->GetName().c_str(),
|
|
cfd->current()->DebugString().data());
|
|
|
|
VersionEdit edit;
|
|
edit.SetColumnFamily(cfd->GetID());
|
|
for (const auto& f : cfd->current()->files_[level]) {
|
|
edit.DeleteFile(level, f->fd.GetNumber());
|
|
edit.AddFile(to_level, f->fd.GetNumber(), f->fd.GetPathId(),
|
|
f->fd.GetFileSize(), f->smallest, f->largest,
|
|
f->smallest_seqno, f->largest_seqno);
|
|
}
|
|
Log(options_.info_log, "[%s] Apply version edit:\n%s",
|
|
cfd->GetName().c_str(), edit.DebugString().data());
|
|
|
|
status = versions_->LogAndApply(cfd, &edit, &mutex_, db_directory_.get());
|
|
superversion_to_free = cfd->InstallSuperVersion(new_superversion, &mutex_);
|
|
new_superversion = nullptr;
|
|
|
|
Log(options_.info_log, "[%s] LogAndApply: %s\n", cfd->GetName().c_str(),
|
|
status.ToString().data());
|
|
|
|
if (status.ok()) {
|
|
Log(options_.info_log, "[%s] After refitting:\n%s",
|
|
cfd->GetName().c_str(), cfd->current()->DebugString().data());
|
|
}
|
|
}
|
|
|
|
refitting_level_ = false;
|
|
bg_work_gate_closed_ = false;
|
|
|
|
mutex_.Unlock();
|
|
delete superversion_to_free;
|
|
delete new_superversion;
|
|
return status;
|
|
}
|
|
|
|
int DBImpl::NumberLevels(ColumnFamilyHandle* column_family) {
|
|
auto cfh = reinterpret_cast<ColumnFamilyHandleImpl*>(column_family);
|
|
return cfh->cfd()->NumberLevels();
|
|
}
|
|
|
|
int DBImpl::MaxMemCompactionLevel(ColumnFamilyHandle* column_family) {
|
|
auto cfh = reinterpret_cast<ColumnFamilyHandleImpl*>(column_family);
|
|
return cfh->cfd()->options()->max_mem_compaction_level;
|
|
}
|
|
|
|
int DBImpl::Level0StopWriteTrigger(ColumnFamilyHandle* column_family) {
|
|
auto cfh = reinterpret_cast<ColumnFamilyHandleImpl*>(column_family);
|
|
return cfh->cfd()->options()->level0_stop_writes_trigger;
|
|
}
|
|
|
|
Status DBImpl::Flush(const FlushOptions& options,
|
|
ColumnFamilyHandle* column_family) {
|
|
auto cfh = reinterpret_cast<ColumnFamilyHandleImpl*>(column_family);
|
|
return FlushMemTable(cfh->cfd(), options);
|
|
}
|
|
|
|
SequenceNumber DBImpl::GetLatestSequenceNumber() const {
|
|
return versions_->LastSequence();
|
|
}
|
|
|
|
Status DBImpl::RunManualCompaction(ColumnFamilyData* cfd, int input_level,
|
|
int output_level, uint32_t output_path_id,
|
|
const Slice* begin, const Slice* end) {
|
|
assert(input_level >= 0);
|
|
|
|
InternalKey begin_storage, end_storage;
|
|
|
|
ManualCompaction manual;
|
|
manual.cfd = cfd;
|
|
manual.input_level = input_level;
|
|
manual.output_level = output_level;
|
|
manual.output_path_id = output_path_id;
|
|
manual.done = false;
|
|
manual.in_progress = false;
|
|
// For universal compaction, we enforce every manual compaction to compact
|
|
// all files.
|
|
if (begin == nullptr ||
|
|
cfd->options()->compaction_style == kCompactionStyleUniversal ||
|
|
cfd->options()->compaction_style == kCompactionStyleFIFO) {
|
|
manual.begin = nullptr;
|
|
} else {
|
|
begin_storage = InternalKey(*begin, kMaxSequenceNumber, kValueTypeForSeek);
|
|
manual.begin = &begin_storage;
|
|
}
|
|
if (end == nullptr ||
|
|
cfd->options()->compaction_style == kCompactionStyleUniversal ||
|
|
cfd->options()->compaction_style == kCompactionStyleFIFO) {
|
|
manual.end = nullptr;
|
|
} else {
|
|
end_storage = InternalKey(*end, 0, static_cast<ValueType>(0));
|
|
manual.end = &end_storage;
|
|
}
|
|
|
|
MutexLock l(&mutex_);
|
|
|
|
// When a manual compaction arrives, temporarily disable scheduling of
|
|
// non-manual compactions and wait until the number of scheduled compaction
|
|
// jobs drops to zero. This is needed to ensure that this manual compaction
|
|
// can compact any range of keys/files.
|
|
//
|
|
// bg_manual_only_ is non-zero when at least one thread is inside
|
|
// RunManualCompaction(), i.e. during that time no other compaction will
|
|
// get scheduled (see MaybeScheduleFlushOrCompaction).
|
|
//
|
|
// Note that the following loop doesn't stop more that one thread calling
|
|
// RunManualCompaction() from getting to the second while loop below.
|
|
// However, only one of them will actually schedule compaction, while
|
|
// others will wait on a condition variable until it completes.
|
|
|
|
++bg_manual_only_;
|
|
while (bg_compaction_scheduled_ > 0) {
|
|
Log(options_.info_log,
|
|
"[%s] Manual compaction waiting for all other scheduled background "
|
|
"compactions to finish",
|
|
cfd->GetName().c_str());
|
|
bg_cv_.Wait();
|
|
}
|
|
|
|
Log(options_.info_log, "[%s] Manual compaction starting",
|
|
cfd->GetName().c_str());
|
|
|
|
while (!manual.done && !shutting_down_.Acquire_Load() && bg_error_.ok()) {
|
|
assert(bg_manual_only_ > 0);
|
|
if (manual_compaction_ != nullptr) {
|
|
// Running either this or some other manual compaction
|
|
bg_cv_.Wait();
|
|
} else {
|
|
manual_compaction_ = &manual;
|
|
MaybeScheduleFlushOrCompaction();
|
|
}
|
|
}
|
|
|
|
assert(!manual.in_progress);
|
|
assert(bg_manual_only_ > 0);
|
|
--bg_manual_only_;
|
|
return manual.status;
|
|
}
|
|
|
|
Status DBImpl::FlushMemTable(ColumnFamilyData* cfd,
|
|
const FlushOptions& options) {
|
|
// nullptr batch means just wait for earlier writes to be done
|
|
Status s = Write(WriteOptions(), nullptr);
|
|
if (s.ok() && options.wait) {
|
|
// Wait until the compaction completes
|
|
s = WaitForFlushMemTable(cfd);
|
|
}
|
|
return s;
|
|
}
|
|
|
|
Status DBImpl::WaitForFlushMemTable(ColumnFamilyData* cfd) {
|
|
Status s;
|
|
// Wait until the compaction completes
|
|
MutexLock l(&mutex_);
|
|
while (cfd->imm()->size() > 0 && bg_error_.ok()) {
|
|
bg_cv_.Wait();
|
|
}
|
|
if (!bg_error_.ok()) {
|
|
s = bg_error_;
|
|
}
|
|
return s;
|
|
}
|
|
|
|
void DBImpl::MaybeScheduleFlushOrCompaction() {
|
|
mutex_.AssertHeld();
|
|
bg_schedule_needed_ = false;
|
|
if (bg_work_gate_closed_) {
|
|
// gate closed for backgrond work
|
|
} else if (shutting_down_.Acquire_Load()) {
|
|
// DB is being deleted; no more background compactions
|
|
} else {
|
|
bool is_flush_pending = false;
|
|
// no need to refcount since we're under a mutex
|
|
for (auto cfd : *versions_->GetColumnFamilySet()) {
|
|
if (cfd->imm()->IsFlushPending()) {
|
|
is_flush_pending = true;
|
|
}
|
|
}
|
|
if (is_flush_pending) {
|
|
// memtable flush needed
|
|
if (bg_flush_scheduled_ < options_.max_background_flushes) {
|
|
bg_flush_scheduled_++;
|
|
env_->Schedule(&DBImpl::BGWorkFlush, this, Env::Priority::HIGH);
|
|
} else if (options_.max_background_flushes > 0) {
|
|
bg_schedule_needed_ = true;
|
|
}
|
|
}
|
|
bool is_compaction_needed = false;
|
|
// no need to refcount since we're under a mutex
|
|
for (auto cfd : *versions_->GetColumnFamilySet()) {
|
|
if (cfd->current()->NeedsCompaction()) {
|
|
is_compaction_needed = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Schedule BGWorkCompaction if there's a compaction pending (or a memtable
|
|
// flush, but the HIGH pool is not enabled)
|
|
// Do it only if max_background_compactions hasn't been reached and, in case
|
|
// bg_manual_only_ > 0, if it's a manual compaction.
|
|
if ((manual_compaction_ || is_compaction_needed ||
|
|
(is_flush_pending && options_.max_background_flushes == 0)) &&
|
|
(!bg_manual_only_ || manual_compaction_)) {
|
|
if (bg_compaction_scheduled_ < options_.max_background_compactions) {
|
|
bg_compaction_scheduled_++;
|
|
env_->Schedule(&DBImpl::BGWorkCompaction, this, Env::Priority::LOW);
|
|
} else {
|
|
bg_schedule_needed_ = true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void DBImpl::RecordFlushIOStats() {
|
|
RecordTick(stats_, FLUSH_WRITE_BYTES, iostats_context.bytes_written);
|
|
IOSTATS_RESET(bytes_written);
|
|
}
|
|
|
|
void DBImpl::RecordCompactionIOStats() {
|
|
RecordTick(stats_, COMPACT_READ_BYTES, IOSTATS(bytes_read));
|
|
IOSTATS_RESET(bytes_read);
|
|
RecordTick(stats_, COMPACT_WRITE_BYTES, IOSTATS(bytes_written));
|
|
IOSTATS_RESET(bytes_written);
|
|
}
|
|
|
|
void DBImpl::BGWorkFlush(void* db) {
|
|
IOSTATS_SET_THREAD_POOL_ID(Env::Priority::HIGH);
|
|
reinterpret_cast<DBImpl*>(db)->BackgroundCallFlush();
|
|
}
|
|
|
|
void DBImpl::BGWorkCompaction(void* db) {
|
|
IOSTATS_SET_THREAD_POOL_ID(Env::Priority::LOW);
|
|
reinterpret_cast<DBImpl*>(db)->BackgroundCallCompaction();
|
|
}
|
|
|
|
Status DBImpl::BackgroundFlush(bool* madeProgress,
|
|
DeletionState& deletion_state,
|
|
LogBuffer* log_buffer) {
|
|
mutex_.AssertHeld();
|
|
// call_status is failure if at least one flush was a failure. even if
|
|
// flushing one column family reports a failure, we will continue flushing
|
|
// other column families. however, call_status will be a failure in that case.
|
|
Status call_status;
|
|
// refcounting in iteration
|
|
for (auto cfd : *versions_->GetColumnFamilySet()) {
|
|
cfd->Ref();
|
|
Status flush_status;
|
|
while (flush_status.ok() && cfd->imm()->IsFlushPending()) {
|
|
LogToBuffer(
|
|
log_buffer,
|
|
"BackgroundCallFlush doing FlushMemTableToOutputFile with column "
|
|
"family [%s], flush slots available %d",
|
|
cfd->GetName().c_str(),
|
|
options_.max_background_flushes - bg_flush_scheduled_);
|
|
flush_status = FlushMemTableToOutputFile(cfd, madeProgress,
|
|
deletion_state, log_buffer);
|
|
}
|
|
if (call_status.ok() && !flush_status.ok()) {
|
|
call_status = flush_status;
|
|
}
|
|
cfd->Unref();
|
|
}
|
|
versions_->GetColumnFamilySet()->FreeDeadColumnFamilies();
|
|
return call_status;
|
|
}
|
|
|
|
void DBImpl::BackgroundCallFlush() {
|
|
bool madeProgress = false;
|
|
DeletionState deletion_state(true);
|
|
assert(bg_flush_scheduled_);
|
|
|
|
LogBuffer log_buffer(InfoLogLevel::INFO_LEVEL, options_.info_log.get());
|
|
{
|
|
MutexLock l(&mutex_);
|
|
|
|
Status s;
|
|
if (!shutting_down_.Acquire_Load()) {
|
|
s = BackgroundFlush(&madeProgress, deletion_state, &log_buffer);
|
|
if (!s.ok()) {
|
|
// Wait a little bit before retrying background compaction in
|
|
// case this is an environmental problem and we do not want to
|
|
// chew up resources for failed compactions for the duration of
|
|
// the problem.
|
|
uint64_t error_cnt =
|
|
default_cf_internal_stats_->BumpAndGetBackgroundErrorCount();
|
|
bg_cv_.SignalAll(); // In case a waiter can proceed despite the error
|
|
mutex_.Unlock();
|
|
Log(options_.info_log,
|
|
"Waiting after background flush error: %s"
|
|
"Accumulated background error counts: %" PRIu64,
|
|
s.ToString().c_str(), error_cnt);
|
|
log_buffer.FlushBufferToLog();
|
|
LogFlush(options_.info_log);
|
|
env_->SleepForMicroseconds(1000000);
|
|
mutex_.Lock();
|
|
}
|
|
}
|
|
|
|
// If !s.ok(), this means that Flush failed. In that case, we want
|
|
// to delete all obsolete files and we force FindObsoleteFiles()
|
|
FindObsoleteFiles(deletion_state, !s.ok());
|
|
// delete unnecessary files if any, this is done outside the mutex
|
|
if (deletion_state.HaveSomethingToDelete() || !log_buffer.IsEmpty()) {
|
|
mutex_.Unlock();
|
|
// Have to flush the info logs before bg_flush_scheduled_--
|
|
// because if bg_flush_scheduled_ becomes 0 and the lock is
|
|
// released, the deconstructor of DB can kick in and destroy all the
|
|
// states of DB so info_log might not be available after that point.
|
|
// It also applies to access other states that DB owns.
|
|
log_buffer.FlushBufferToLog();
|
|
if (deletion_state.HaveSomethingToDelete()) {
|
|
PurgeObsoleteFiles(deletion_state);
|
|
}
|
|
mutex_.Lock();
|
|
}
|
|
|
|
bg_flush_scheduled_--;
|
|
// Any time the mutex is released After finding the work to do, another
|
|
// thread might execute MaybeScheduleFlushOrCompaction(). It is possible
|
|
// that there is a pending job but it is not scheduled because of the
|
|
// max thread limit.
|
|
if (madeProgress || bg_schedule_needed_) {
|
|
MaybeScheduleFlushOrCompaction();
|
|
}
|
|
bg_cv_.SignalAll();
|
|
// IMPORTANT: there should be no code after calling SignalAll. This call may
|
|
// signal the DB destructor that it's OK to proceed with destruction. In
|
|
// that case, all DB variables will be dealloacated and referencing them
|
|
// will cause trouble.
|
|
}
|
|
RecordFlushIOStats();
|
|
}
|
|
|
|
void DBImpl::BackgroundCallCompaction() {
|
|
bool madeProgress = false;
|
|
DeletionState deletion_state(true);
|
|
|
|
MaybeDumpStats();
|
|
LogBuffer log_buffer(InfoLogLevel::INFO_LEVEL, options_.info_log.get());
|
|
{
|
|
MutexLock l(&mutex_);
|
|
assert(bg_compaction_scheduled_);
|
|
Status s;
|
|
if (!shutting_down_.Acquire_Load()) {
|
|
s = BackgroundCompaction(&madeProgress, deletion_state, &log_buffer);
|
|
if (!s.ok()) {
|
|
// Wait a little bit before retrying background compaction in
|
|
// case this is an environmental problem and we do not want to
|
|
// chew up resources for failed compactions for the duration of
|
|
// the problem.
|
|
uint64_t error_cnt =
|
|
default_cf_internal_stats_->BumpAndGetBackgroundErrorCount();
|
|
bg_cv_.SignalAll(); // In case a waiter can proceed despite the error
|
|
mutex_.Unlock();
|
|
log_buffer.FlushBufferToLog();
|
|
Log(options_.info_log,
|
|
"Waiting after background compaction error: %s, "
|
|
"Accumulated background error counts: %" PRIu64,
|
|
s.ToString().c_str(), error_cnt);
|
|
LogFlush(options_.info_log);
|
|
env_->SleepForMicroseconds(1000000);
|
|
mutex_.Lock();
|
|
}
|
|
}
|
|
|
|
// If !s.ok(), this means that Compaction failed. In that case, we want
|
|
// to delete all obsolete files we might have created and we force
|
|
// FindObsoleteFiles(). This is because deletion_state does not catch
|
|
// all created files if compaction failed.
|
|
FindObsoleteFiles(deletion_state, !s.ok());
|
|
|
|
// delete unnecessary files if any, this is done outside the mutex
|
|
if (deletion_state.HaveSomethingToDelete() || !log_buffer.IsEmpty()) {
|
|
mutex_.Unlock();
|
|
// Have to flush the info logs before bg_compaction_scheduled_--
|
|
// because if bg_flush_scheduled_ becomes 0 and the lock is
|
|
// released, the deconstructor of DB can kick in and destroy all the
|
|
// states of DB so info_log might not be available after that point.
|
|
// It also applies to access other states that DB owns.
|
|
log_buffer.FlushBufferToLog();
|
|
if (deletion_state.HaveSomethingToDelete()) {
|
|
PurgeObsoleteFiles(deletion_state);
|
|
}
|
|
mutex_.Lock();
|
|
}
|
|
|
|
bg_compaction_scheduled_--;
|
|
|
|
versions_->GetColumnFamilySet()->FreeDeadColumnFamilies();
|
|
|
|
// Previous compaction may have produced too many files in a level,
|
|
// So reschedule another compaction if we made progress in the
|
|
// last compaction.
|
|
//
|
|
// Also, any time the mutex is released After finding the work to do,
|
|
// another thread might execute MaybeScheduleFlushOrCompaction(). It is
|
|
// possible that there is a pending job but it is not scheduled because of
|
|
// the max thread limit.
|
|
if (madeProgress || bg_schedule_needed_) {
|
|
MaybeScheduleFlushOrCompaction();
|
|
}
|
|
if (madeProgress || bg_compaction_scheduled_ == 0 || bg_manual_only_ > 0) {
|
|
// signal if
|
|
// * madeProgress -- need to wakeup MakeRoomForWrite
|
|
// * bg_compaction_scheduled_ == 0 -- need to wakeup ~DBImpl
|
|
// * bg_manual_only_ > 0 -- need to wakeup RunManualCompaction
|
|
// If none of this is true, there is no need to signal since nobody is
|
|
// waiting for it
|
|
bg_cv_.SignalAll();
|
|
}
|
|
// IMPORTANT: there should be no code after calling SignalAll. This call may
|
|
// signal the DB destructor that it's OK to proceed with destruction. In
|
|
// that case, all DB variables will be dealloacated and referencing them
|
|
// will cause trouble.
|
|
}
|
|
}
|
|
|
|
Status DBImpl::BackgroundCompaction(bool* madeProgress,
|
|
DeletionState& deletion_state,
|
|
LogBuffer* log_buffer) {
|
|
*madeProgress = false;
|
|
mutex_.AssertHeld();
|
|
|
|
bool is_manual = (manual_compaction_ != nullptr) &&
|
|
(manual_compaction_->in_progress == false);
|
|
|
|
if (is_manual) {
|
|
// another thread cannot pick up the same work
|
|
manual_compaction_->in_progress = true;
|
|
}
|
|
|
|
// FLUSH preempts compaction
|
|
Status flush_stat;
|
|
for (auto cfd : *versions_->GetColumnFamilySet()) {
|
|
while (cfd->imm()->IsFlushPending()) {
|
|
LogToBuffer(
|
|
log_buffer,
|
|
"BackgroundCompaction doing FlushMemTableToOutputFile, "
|
|
"compaction slots available %d",
|
|
options_.max_background_compactions - bg_compaction_scheduled_);
|
|
cfd->Ref();
|
|
flush_stat = FlushMemTableToOutputFile(cfd, madeProgress, deletion_state,
|
|
log_buffer);
|
|
cfd->Unref();
|
|
if (!flush_stat.ok()) {
|
|
if (is_manual) {
|
|
manual_compaction_->status = flush_stat;
|
|
manual_compaction_->done = true;
|
|
manual_compaction_->in_progress = false;
|
|
manual_compaction_ = nullptr;
|
|
}
|
|
return flush_stat;
|
|
}
|
|
}
|
|
}
|
|
|
|
unique_ptr<Compaction> c;
|
|
InternalKey manual_end_storage;
|
|
InternalKey* manual_end = &manual_end_storage;
|
|
if (is_manual) {
|
|
ManualCompaction* m = manual_compaction_;
|
|
assert(m->in_progress);
|
|
c.reset(m->cfd->CompactRange(m->input_level, m->output_level,
|
|
m->output_path_id, m->begin, m->end,
|
|
&manual_end));
|
|
if (!c) {
|
|
m->done = true;
|
|
}
|
|
LogToBuffer(log_buffer,
|
|
"[%s] Manual compaction from level-%d to level-%d from %s .. "
|
|
"%s; will stop at %s\n",
|
|
m->cfd->GetName().c_str(), m->input_level, m->output_level,
|
|
(m->begin ? m->begin->DebugString().c_str() : "(begin)"),
|
|
(m->end ? m->end->DebugString().c_str() : "(end)"),
|
|
((m->done || manual_end == nullptr)
|
|
? "(end)"
|
|
: manual_end->DebugString().c_str()));
|
|
} else {
|
|
// no need to refcount in iteration since it's always under a mutex
|
|
for (auto cfd : *versions_->GetColumnFamilySet()) {
|
|
if (!cfd->options()->disable_auto_compactions) {
|
|
c.reset(cfd->PickCompaction(log_buffer));
|
|
if (c != nullptr) {
|
|
// update statistics
|
|
MeasureTime(stats_, NUM_FILES_IN_SINGLE_COMPACTION,
|
|
c->inputs(0)->size());
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
Status status;
|
|
if (!c) {
|
|
// Nothing to do
|
|
LogToBuffer(log_buffer, "Compaction nothing to do");
|
|
} else if (c->IsDeletionCompaction()) {
|
|
// TODO(icanadi) Do we want to honor snapshots here? i.e. not delete old
|
|
// file if there is alive snapshot pointing to it
|
|
assert(c->num_input_files(1) == 0);
|
|
assert(c->level() == 0);
|
|
assert(c->column_family_data()->options()->compaction_style ==
|
|
kCompactionStyleFIFO);
|
|
for (const auto& f : *c->inputs(0)) {
|
|
c->edit()->DeleteFile(c->level(), f->fd.GetNumber());
|
|
}
|
|
status = versions_->LogAndApply(c->column_family_data(), c->edit(), &mutex_,
|
|
db_directory_.get());
|
|
InstallSuperVersion(c->column_family_data(), deletion_state);
|
|
LogToBuffer(log_buffer, "[%s] Deleted %d files\n",
|
|
c->column_family_data()->GetName().c_str(),
|
|
c->num_input_files(0));
|
|
c->ReleaseCompactionFiles(status);
|
|
*madeProgress = true;
|
|
} else if (!is_manual && c->IsTrivialMove()) {
|
|
// Move file to next level
|
|
assert(c->num_input_files(0) == 1);
|
|
FileMetaData* f = c->input(0, 0);
|
|
c->edit()->DeleteFile(c->level(), f->fd.GetNumber());
|
|
c->edit()->AddFile(c->level() + 1, f->fd.GetNumber(), f->fd.GetPathId(),
|
|
f->fd.GetFileSize(), f->smallest, f->largest,
|
|
f->smallest_seqno, f->largest_seqno);
|
|
status = versions_->LogAndApply(c->column_family_data(), c->edit(), &mutex_,
|
|
db_directory_.get());
|
|
InstallSuperVersion(c->column_family_data(), deletion_state);
|
|
|
|
Version::LevelSummaryStorage tmp;
|
|
LogToBuffer(
|
|
log_buffer, "[%s] Moved #%lld to level-%d %lld bytes %s: %s\n",
|
|
c->column_family_data()->GetName().c_str(),
|
|
static_cast<unsigned long long>(f->fd.GetNumber()), c->level() + 1,
|
|
static_cast<unsigned long long>(f->fd.GetFileSize()),
|
|
status.ToString().c_str(), c->input_version()->LevelSummary(&tmp));
|
|
c->ReleaseCompactionFiles(status);
|
|
*madeProgress = true;
|
|
} else {
|
|
MaybeScheduleFlushOrCompaction(); // do more compaction work in parallel.
|
|
CompactionState* compact = new CompactionState(c.get());
|
|
status = DoCompactionWork(compact, deletion_state, log_buffer);
|
|
CleanupCompaction(compact, status);
|
|
c->ReleaseCompactionFiles(status);
|
|
c->ReleaseInputs();
|
|
*madeProgress = true;
|
|
}
|
|
c.reset();
|
|
|
|
if (status.ok()) {
|
|
// Done
|
|
} else if (shutting_down_.Acquire_Load()) {
|
|
// Ignore compaction errors found during shutting down
|
|
} else {
|
|
Log(InfoLogLevel::WARN_LEVEL, options_.info_log, "Compaction error: %s",
|
|
status.ToString().c_str());
|
|
if (options_.paranoid_checks && bg_error_.ok()) {
|
|
bg_error_ = status;
|
|
}
|
|
}
|
|
|
|
if (is_manual) {
|
|
ManualCompaction* m = manual_compaction_;
|
|
if (!status.ok()) {
|
|
m->status = status;
|
|
m->done = true;
|
|
}
|
|
// For universal compaction:
|
|
// Because universal compaction always happens at level 0, so one
|
|
// compaction will pick up all overlapped files. No files will be
|
|
// filtered out due to size limit and left for a successive compaction.
|
|
// So we can safely conclude the current compaction.
|
|
//
|
|
// Also note that, if we don't stop here, then the current compaction
|
|
// writes a new file back to level 0, which will be used in successive
|
|
// compaction. Hence the manual compaction will never finish.
|
|
//
|
|
// Stop the compaction if manual_end points to nullptr -- this means
|
|
// that we compacted the whole range. manual_end should always point
|
|
// to nullptr in case of universal compaction
|
|
if (manual_end == nullptr) {
|
|
m->done = true;
|
|
}
|
|
if (!m->done) {
|
|
// We only compacted part of the requested range. Update *m
|
|
// to the range that is left to be compacted.
|
|
// Universal and FIFO compactions should always compact the whole range
|
|
assert(m->cfd->options()->compaction_style != kCompactionStyleUniversal);
|
|
assert(m->cfd->options()->compaction_style != kCompactionStyleFIFO);
|
|
m->tmp_storage = *manual_end;
|
|
m->begin = &m->tmp_storage;
|
|
}
|
|
m->in_progress = false; // not being processed anymore
|
|
manual_compaction_ = nullptr;
|
|
}
|
|
return status;
|
|
}
|
|
|
|
void DBImpl::CleanupCompaction(CompactionState* compact, Status status) {
|
|
mutex_.AssertHeld();
|
|
if (compact->builder != nullptr) {
|
|
// May happen if we get a shutdown call in the middle of compaction
|
|
compact->builder->Abandon();
|
|
compact->builder.reset();
|
|
} else {
|
|
assert(compact->outfile == nullptr);
|
|
}
|
|
for (size_t i = 0; i < compact->outputs.size(); i++) {
|
|
const CompactionState::Output& out = compact->outputs[i];
|
|
pending_outputs_.erase(out.number);
|
|
|
|
// If this file was inserted into the table cache then remove
|
|
// them here because this compaction was not committed.
|
|
if (!status.ok()) {
|
|
TableCache::Evict(table_cache_.get(), out.number);
|
|
}
|
|
}
|
|
delete compact;
|
|
}
|
|
|
|
// Allocate the file numbers for the output file. We allocate as
|
|
// many output file numbers as there are files in level+1 (at least one)
|
|
// Insert them into pending_outputs so that they do not get deleted.
|
|
void DBImpl::AllocateCompactionOutputFileNumbers(CompactionState* compact) {
|
|
mutex_.AssertHeld();
|
|
assert(compact != nullptr);
|
|
assert(compact->builder == nullptr);
|
|
int filesNeeded = compact->compaction->num_input_files(1);
|
|
for (int i = 0; i < std::max(filesNeeded, 1); i++) {
|
|
uint64_t file_number = versions_->NewFileNumber();
|
|
pending_outputs_[file_number] = compact->compaction->GetOutputPathId();
|
|
compact->allocated_file_numbers.push_back(file_number);
|
|
}
|
|
}
|
|
|
|
// Frees up unused file number.
|
|
void DBImpl::ReleaseCompactionUnusedFileNumbers(CompactionState* compact) {
|
|
mutex_.AssertHeld();
|
|
for (const auto file_number : compact->allocated_file_numbers) {
|
|
pending_outputs_.erase(file_number);
|
|
}
|
|
}
|
|
|
|
Status DBImpl::OpenCompactionOutputFile(CompactionState* compact) {
|
|
assert(compact != nullptr);
|
|
assert(compact->builder == nullptr);
|
|
uint64_t file_number;
|
|
// If we have not yet exhausted the pre-allocated file numbers,
|
|
// then use the one from the front. Otherwise, we have to acquire
|
|
// the heavyweight lock and allocate a new file number.
|
|
if (!compact->allocated_file_numbers.empty()) {
|
|
file_number = compact->allocated_file_numbers.front();
|
|
compact->allocated_file_numbers.pop_front();
|
|
} else {
|
|
mutex_.Lock();
|
|
file_number = versions_->NewFileNumber();
|
|
pending_outputs_[file_number] = compact->compaction->GetOutputPathId();
|
|
mutex_.Unlock();
|
|
}
|
|
CompactionState::Output out;
|
|
out.number = file_number;
|
|
out.path_id = compact->compaction->GetOutputPathId();
|
|
out.smallest.Clear();
|
|
out.largest.Clear();
|
|
out.smallest_seqno = out.largest_seqno = 0;
|
|
compact->outputs.push_back(out);
|
|
|
|
// Make the output file
|
|
std::string fname = TableFileName(options_.db_paths, file_number,
|
|
compact->compaction->GetOutputPathId());
|
|
Status s = env_->NewWritableFile(fname, &compact->outfile, storage_options_);
|
|
|
|
if (s.ok()) {
|
|
compact->outfile->SetIOPriority(Env::IO_LOW);
|
|
compact->outfile->SetPreallocationBlockSize(
|
|
compact->compaction->OutputFilePreallocationSize());
|
|
|
|
ColumnFamilyData* cfd = compact->compaction->column_family_data();
|
|
compact->builder.reset(NewTableBuilder(
|
|
*cfd->options(), cfd->internal_comparator(), compact->outfile.get(),
|
|
compact->compaction->OutputCompressionType()));
|
|
}
|
|
LogFlush(options_.info_log);
|
|
return s;
|
|
}
|
|
|
|
Status DBImpl::FinishCompactionOutputFile(CompactionState* compact,
|
|
Iterator* input) {
|
|
assert(compact != nullptr);
|
|
assert(compact->outfile);
|
|
assert(compact->builder != nullptr);
|
|
|
|
const uint64_t output_number = compact->current_output()->number;
|
|
const uint32_t output_path_id = compact->current_output()->path_id;
|
|
assert(output_number != 0);
|
|
|
|
// Check for iterator errors
|
|
Status s = input->status();
|
|
const uint64_t current_entries = compact->builder->NumEntries();
|
|
if (s.ok()) {
|
|
s = compact->builder->Finish();
|
|
} else {
|
|
compact->builder->Abandon();
|
|
}
|
|
const uint64_t current_bytes = compact->builder->FileSize();
|
|
compact->current_output()->file_size = current_bytes;
|
|
compact->total_bytes += current_bytes;
|
|
compact->builder.reset();
|
|
|
|
// Finish and check for file errors
|
|
if (s.ok() && !options_.disableDataSync) {
|
|
if (options_.use_fsync) {
|
|
StopWatch sw(env_, stats_, COMPACTION_OUTFILE_SYNC_MICROS);
|
|
s = compact->outfile->Fsync();
|
|
} else {
|
|
StopWatch sw(env_, stats_, COMPACTION_OUTFILE_SYNC_MICROS);
|
|
s = compact->outfile->Sync();
|
|
}
|
|
}
|
|
if (s.ok()) {
|
|
s = compact->outfile->Close();
|
|
}
|
|
compact->outfile.reset();
|
|
|
|
if (s.ok() && current_entries > 0) {
|
|
// Verify that the table is usable
|
|
ColumnFamilyData* cfd = compact->compaction->column_family_data();
|
|
FileDescriptor fd(output_number, output_path_id, current_bytes);
|
|
Iterator* iter = cfd->table_cache()->NewIterator(
|
|
ReadOptions(), storage_options_, cfd->internal_comparator(), fd);
|
|
s = iter->status();
|
|
delete iter;
|
|
if (s.ok()) {
|
|
Log(options_.info_log, "[%s] Generated table #%" PRIu64 ": %" PRIu64
|
|
" keys, %" PRIu64 " bytes",
|
|
cfd->GetName().c_str(), output_number, current_entries,
|
|
current_bytes);
|
|
}
|
|
}
|
|
return s;
|
|
}
|
|
|
|
|
|
Status DBImpl::InstallCompactionResults(CompactionState* compact,
|
|
LogBuffer* log_buffer) {
|
|
mutex_.AssertHeld();
|
|
|
|
// paranoia: verify that the files that we started with
|
|
// still exist in the current version and in the same original level.
|
|
// This ensures that a concurrent compaction did not erroneously
|
|
// pick the same files to compact.
|
|
if (!versions_->VerifyCompactionFileConsistency(compact->compaction)) {
|
|
Log(options_.info_log, "[%s] Compaction %d@%d + %d@%d files aborted",
|
|
compact->compaction->column_family_data()->GetName().c_str(),
|
|
compact->compaction->num_input_files(0), compact->compaction->level(),
|
|
compact->compaction->num_input_files(1),
|
|
compact->compaction->output_level());
|
|
return Status::Corruption("Compaction input files inconsistent");
|
|
}
|
|
|
|
LogToBuffer(log_buffer, "[%s] Compacted %d@%d + %d@%d files => %lld bytes",
|
|
compact->compaction->column_family_data()->GetName().c_str(),
|
|
compact->compaction->num_input_files(0),
|
|
compact->compaction->level(),
|
|
compact->compaction->num_input_files(1),
|
|
compact->compaction->output_level(),
|
|
static_cast<long long>(compact->total_bytes));
|
|
|
|
// Add compaction outputs
|
|
compact->compaction->AddInputDeletions(compact->compaction->edit());
|
|
for (size_t i = 0; i < compact->outputs.size(); i++) {
|
|
const CompactionState::Output& out = compact->outputs[i];
|
|
compact->compaction->edit()->AddFile(compact->compaction->output_level(),
|
|
out.number, out.path_id, out.file_size,
|
|
out.smallest, out.largest,
|
|
out.smallest_seqno, out.largest_seqno);
|
|
}
|
|
return versions_->LogAndApply(compact->compaction->column_family_data(),
|
|
compact->compaction->edit(), &mutex_,
|
|
db_directory_.get());
|
|
}
|
|
|
|
// Given a sequence number, return the sequence number of the
|
|
// earliest snapshot that this sequence number is visible in.
|
|
// The snapshots themselves are arranged in ascending order of
|
|
// sequence numbers.
|
|
// Employ a sequential search because the total number of
|
|
// snapshots are typically small.
|
|
inline SequenceNumber DBImpl::findEarliestVisibleSnapshot(
|
|
SequenceNumber in, std::vector<SequenceNumber>& snapshots,
|
|
SequenceNumber* prev_snapshot) {
|
|
SequenceNumber prev __attribute__((unused)) = 0;
|
|
for (const auto cur : snapshots) {
|
|
assert(prev <= cur);
|
|
if (cur >= in) {
|
|
*prev_snapshot = prev;
|
|
return cur;
|
|
}
|
|
prev = cur; // assignment
|
|
assert(prev);
|
|
}
|
|
Log(options_.info_log,
|
|
"Looking for seqid %" PRIu64 " but maxseqid is %" PRIu64 "", in,
|
|
snapshots[snapshots.size() - 1]);
|
|
assert(0);
|
|
return 0;
|
|
}
|
|
|
|
uint64_t DBImpl::CallFlushDuringCompaction(ColumnFamilyData* cfd,
|
|
DeletionState& deletion_state,
|
|
LogBuffer* log_buffer) {
|
|
if (cfd->imm()->imm_flush_needed.NoBarrier_Load() != nullptr) {
|
|
const uint64_t imm_start = env_->NowMicros();
|
|
mutex_.Lock();
|
|
if (cfd->imm()->IsFlushPending()) {
|
|
cfd->Ref();
|
|
FlushMemTableToOutputFile(cfd, nullptr, deletion_state, log_buffer);
|
|
cfd->Unref();
|
|
bg_cv_.SignalAll(); // Wakeup MakeRoomForWrite() if necessary
|
|
}
|
|
mutex_.Unlock();
|
|
log_buffer->FlushBufferToLog();
|
|
return env_->NowMicros() - imm_start;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
Status DBImpl::ProcessKeyValueCompaction(
|
|
bool is_snapshot_supported,
|
|
SequenceNumber visible_at_tip,
|
|
SequenceNumber earliest_snapshot,
|
|
SequenceNumber latest_snapshot,
|
|
DeletionState& deletion_state,
|
|
bool bottommost_level,
|
|
int64_t& imm_micros,
|
|
Iterator* input,
|
|
CompactionState* compact,
|
|
bool is_compaction_v2,
|
|
LogBuffer* log_buffer) {
|
|
size_t combined_idx = 0;
|
|
Status status;
|
|
std::string compaction_filter_value;
|
|
ParsedInternalKey ikey;
|
|
IterKey current_user_key;
|
|
bool has_current_user_key = false;
|
|
IterKey delete_key;
|
|
SequenceNumber last_sequence_for_key __attribute__((unused)) =
|
|
kMaxSequenceNumber;
|
|
SequenceNumber visible_in_snapshot = kMaxSequenceNumber;
|
|
ColumnFamilyData* cfd = compact->compaction->column_family_data();
|
|
MergeHelper merge(
|
|
cfd->user_comparator(), cfd->options()->merge_operator.get(),
|
|
options_.info_log.get(), cfd->options()->min_partial_merge_operands,
|
|
false /* internal key corruption is expected */);
|
|
auto compaction_filter = cfd->options()->compaction_filter;
|
|
std::unique_ptr<CompactionFilter> compaction_filter_from_factory = nullptr;
|
|
if (!compaction_filter) {
|
|
auto context = compact->GetFilterContextV1();
|
|
compaction_filter_from_factory =
|
|
cfd->options()->compaction_filter_factory->CreateCompactionFilter(
|
|
context);
|
|
compaction_filter = compaction_filter_from_factory.get();
|
|
}
|
|
|
|
while (input->Valid() && !shutting_down_.Acquire_Load() &&
|
|
!cfd->IsDropped()) {
|
|
RecordCompactionIOStats();
|
|
// FLUSH preempts compaction
|
|
// TODO(icanadi) this currently only checks if flush is necessary on
|
|
// compacting column family. we should also check if flush is necessary on
|
|
// other column families, too
|
|
imm_micros += CallFlushDuringCompaction(cfd, deletion_state, log_buffer);
|
|
|
|
Slice key;
|
|
Slice value;
|
|
// If is_compaction_v2 is on, kv-pairs are reset to the prefix batch.
|
|
// This prefix batch should contain results after calling
|
|
// compaction_filter_v2.
|
|
//
|
|
// If is_compaction_v2 is off, this function will go through all the
|
|
// kv-pairs in input.
|
|
if (!is_compaction_v2) {
|
|
key = input->key();
|
|
value = input->value();
|
|
} else {
|
|
if (combined_idx >= compact->combined_key_buf_.size()) {
|
|
break;
|
|
}
|
|
assert(combined_idx < compact->combined_key_buf_.size());
|
|
key = compact->combined_key_buf_[combined_idx];
|
|
value = compact->combined_value_buf_[combined_idx];
|
|
|
|
++combined_idx;
|
|
}
|
|
|
|
if (compact->compaction->ShouldStopBefore(key) &&
|
|
compact->builder != nullptr) {
|
|
status = FinishCompactionOutputFile(compact, input);
|
|
if (!status.ok()) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Handle key/value, add to state, etc.
|
|
bool drop = false;
|
|
bool current_entry_is_merging = false;
|
|
if (!ParseInternalKey(key, &ikey)) {
|
|
// Do not hide error keys
|
|
// TODO: error key stays in db forever? Figure out the intention/rationale
|
|
// v10 error v8 : we cannot hide v8 even though it's pretty obvious.
|
|
current_user_key.Clear();
|
|
has_current_user_key = false;
|
|
last_sequence_for_key = kMaxSequenceNumber;
|
|
visible_in_snapshot = kMaxSequenceNumber;
|
|
} else {
|
|
if (!has_current_user_key ||
|
|
cfd->user_comparator()->Compare(ikey.user_key,
|
|
current_user_key.GetKey()) != 0) {
|
|
// First occurrence of this user key
|
|
current_user_key.SetKey(ikey.user_key);
|
|
has_current_user_key = true;
|
|
last_sequence_for_key = kMaxSequenceNumber;
|
|
visible_in_snapshot = kMaxSequenceNumber;
|
|
// apply the compaction filter to the first occurrence of the user key
|
|
if (compaction_filter && !is_compaction_v2 &&
|
|
ikey.type == kTypeValue &&
|
|
(visible_at_tip || ikey.sequence > latest_snapshot)) {
|
|
// If the user has specified a compaction filter and the sequence
|
|
// number is greater than any external snapshot, then invoke the
|
|
// filter.
|
|
// If the return value of the compaction filter is true, replace
|
|
// the entry with a delete marker.
|
|
bool value_changed = false;
|
|
compaction_filter_value.clear();
|
|
bool to_delete = compaction_filter->Filter(
|
|
compact->compaction->level(), ikey.user_key, value,
|
|
&compaction_filter_value, &value_changed);
|
|
if (to_delete) {
|
|
// make a copy of the original key and convert it to a delete
|
|
delete_key.SetInternalKey(ExtractUserKey(key), ikey.sequence,
|
|
kTypeDeletion);
|
|
// anchor the key again
|
|
key = delete_key.GetKey();
|
|
// needed because ikey is backed by key
|
|
ParseInternalKey(key, &ikey);
|
|
// no value associated with delete
|
|
value.clear();
|
|
RecordTick(stats_, COMPACTION_KEY_DROP_USER);
|
|
} else if (value_changed) {
|
|
value = compaction_filter_value;
|
|
}
|
|
}
|
|
}
|
|
|
|
// If there are no snapshots, then this kv affect visibility at tip.
|
|
// Otherwise, search though all existing snapshots to find
|
|
// the earlist snapshot that is affected by this kv.
|
|
SequenceNumber prev_snapshot = 0; // 0 means no previous snapshot
|
|
SequenceNumber visible = visible_at_tip ? visible_at_tip :
|
|
is_snapshot_supported ? findEarliestVisibleSnapshot(ikey.sequence,
|
|
compact->existing_snapshots, &prev_snapshot)
|
|
: 0;
|
|
|
|
if (visible_in_snapshot == visible) {
|
|
// If the earliest snapshot is which this key is visible in
|
|
// is the same as the visibily of a previous instance of the
|
|
// same key, then this kv is not visible in any snapshot.
|
|
// Hidden by an newer entry for same user key
|
|
// TODO: why not > ?
|
|
assert(last_sequence_for_key >= ikey.sequence);
|
|
drop = true; // (A)
|
|
RecordTick(stats_, COMPACTION_KEY_DROP_NEWER_ENTRY);
|
|
} else if (ikey.type == kTypeDeletion &&
|
|
ikey.sequence <= earliest_snapshot &&
|
|
compact->compaction->KeyNotExistsBeyondOutputLevel(ikey.user_key)) {
|
|
// For this user key:
|
|
// (1) there is no data in higher levels
|
|
// (2) data in lower levels will have larger sequence numbers
|
|
// (3) data in layers that are being compacted here and have
|
|
// smaller sequence numbers will be dropped in the next
|
|
// few iterations of this loop (by rule (A) above).
|
|
// Therefore this deletion marker is obsolete and can be dropped.
|
|
drop = true;
|
|
RecordTick(stats_, COMPACTION_KEY_DROP_OBSOLETE);
|
|
} else if (ikey.type == kTypeMerge) {
|
|
if (!merge.HasOperator()) {
|
|
LogToBuffer(log_buffer, "Options::merge_operator is null.");
|
|
status = Status::InvalidArgument(
|
|
"merge_operator is not properly initialized.");
|
|
break;
|
|
}
|
|
// We know the merge type entry is not hidden, otherwise we would
|
|
// have hit (A)
|
|
// We encapsulate the merge related state machine in a different
|
|
// object to minimize change to the existing flow. Turn out this
|
|
// logic could also be nicely re-used for memtable flush purge
|
|
// optimization in BuildTable.
|
|
int steps = 0;
|
|
merge.MergeUntil(input, prev_snapshot, bottommost_level,
|
|
options_.statistics.get(), &steps);
|
|
// Skip the Merge ops
|
|
combined_idx = combined_idx - 1 + steps;
|
|
|
|
current_entry_is_merging = true;
|
|
if (merge.IsSuccess()) {
|
|
// Successfully found Put/Delete/(end-of-key-range) while merging
|
|
// Get the merge result
|
|
key = merge.key();
|
|
ParseInternalKey(key, &ikey);
|
|
value = merge.value();
|
|
} else {
|
|
// Did not find a Put/Delete/(end-of-key-range) while merging
|
|
// We now have some stack of merge operands to write out.
|
|
// NOTE: key,value, and ikey are now referring to old entries.
|
|
// These will be correctly set below.
|
|
assert(!merge.keys().empty());
|
|
assert(merge.keys().size() == merge.values().size());
|
|
|
|
// Hack to make sure last_sequence_for_key is correct
|
|
ParseInternalKey(merge.keys().front(), &ikey);
|
|
}
|
|
}
|
|
|
|
last_sequence_for_key = ikey.sequence;
|
|
visible_in_snapshot = visible;
|
|
}
|
|
|
|
if (!drop) {
|
|
// We may write a single key (e.g.: for Put/Delete or successful merge).
|
|
// Or we may instead have to write a sequence/list of keys.
|
|
// We have to write a sequence iff we have an unsuccessful merge
|
|
bool has_merge_list = current_entry_is_merging && !merge.IsSuccess();
|
|
const std::deque<std::string>* keys = nullptr;
|
|
const std::deque<std::string>* values = nullptr;
|
|
std::deque<std::string>::const_reverse_iterator key_iter;
|
|
std::deque<std::string>::const_reverse_iterator value_iter;
|
|
if (has_merge_list) {
|
|
keys = &merge.keys();
|
|
values = &merge.values();
|
|
key_iter = keys->rbegin(); // The back (*rbegin()) is the first key
|
|
value_iter = values->rbegin();
|
|
|
|
key = Slice(*key_iter);
|
|
value = Slice(*value_iter);
|
|
}
|
|
|
|
// If we have a list of keys to write, traverse the list.
|
|
// If we have a single key to write, simply write that key.
|
|
while (true) {
|
|
// Invariant: key,value,ikey will always be the next entry to write
|
|
char* kptr = (char*)key.data();
|
|
std::string kstr;
|
|
|
|
// Zeroing out the sequence number leads to better compression.
|
|
// If this is the bottommost level (no files in lower levels)
|
|
// and the earliest snapshot is larger than this seqno
|
|
// then we can squash the seqno to zero.
|
|
if (bottommost_level && ikey.sequence < earliest_snapshot &&
|
|
ikey.type != kTypeMerge) {
|
|
assert(ikey.type != kTypeDeletion);
|
|
// make a copy because updating in place would cause problems
|
|
// with the priority queue that is managing the input key iterator
|
|
kstr.assign(key.data(), key.size());
|
|
kptr = (char *)kstr.c_str();
|
|
UpdateInternalKey(kptr, key.size(), (uint64_t)0, ikey.type);
|
|
}
|
|
|
|
Slice newkey(kptr, key.size());
|
|
assert((key.clear(), 1)); // we do not need 'key' anymore
|
|
|
|
// Open output file if necessary
|
|
if (compact->builder == nullptr) {
|
|
status = OpenCompactionOutputFile(compact);
|
|
if (!status.ok()) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
SequenceNumber seqno = GetInternalKeySeqno(newkey);
|
|
if (compact->builder->NumEntries() == 0) {
|
|
compact->current_output()->smallest.DecodeFrom(newkey);
|
|
compact->current_output()->smallest_seqno = seqno;
|
|
} else {
|
|
compact->current_output()->smallest_seqno =
|
|
std::min(compact->current_output()->smallest_seqno, seqno);
|
|
}
|
|
compact->current_output()->largest.DecodeFrom(newkey);
|
|
compact->builder->Add(newkey, value);
|
|
compact->current_output()->largest_seqno =
|
|
std::max(compact->current_output()->largest_seqno, seqno);
|
|
|
|
// Close output file if it is big enough
|
|
if (compact->builder->FileSize() >=
|
|
compact->compaction->MaxOutputFileSize()) {
|
|
status = FinishCompactionOutputFile(compact, input);
|
|
if (!status.ok()) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
// If we have a list of entries, move to next element
|
|
// If we only had one entry, then break the loop.
|
|
if (has_merge_list) {
|
|
++key_iter;
|
|
++value_iter;
|
|
|
|
// If at end of list
|
|
if (key_iter == keys->rend() || value_iter == values->rend()) {
|
|
// Sanity Check: if one ends, then both end
|
|
assert(key_iter == keys->rend() && value_iter == values->rend());
|
|
break;
|
|
}
|
|
|
|
// Otherwise not at end of list. Update key, value, and ikey.
|
|
key = Slice(*key_iter);
|
|
value = Slice(*value_iter);
|
|
ParseInternalKey(key, &ikey);
|
|
|
|
} else{
|
|
// Only had one item to begin with (Put/Delete)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// MergeUntil has moved input to the next entry
|
|
if (!current_entry_is_merging) {
|
|
input->Next();
|
|
}
|
|
}
|
|
|
|
RecordCompactionIOStats();
|
|
|
|
return status;
|
|
}
|
|
|
|
void DBImpl::CallCompactionFilterV2(CompactionState* compact,
|
|
CompactionFilterV2* compaction_filter_v2) {
|
|
if (compact == nullptr || compaction_filter_v2 == nullptr) {
|
|
return;
|
|
}
|
|
|
|
std::vector<Slice> user_key_buf;
|
|
for (const auto& key : compact->ikey_buf_) {
|
|
user_key_buf.emplace_back(key.user_key);
|
|
}
|
|
|
|
// If the user has specified a compaction filter and the sequence
|
|
// number is greater than any external snapshot, then invoke the
|
|
// filter.
|
|
// If the return value of the compaction filter is true, replace
|
|
// the entry with a delete marker.
|
|
compact->to_delete_buf_ = compaction_filter_v2->Filter(
|
|
compact->compaction->level(),
|
|
user_key_buf, compact->existing_value_buf_,
|
|
&compact->new_value_buf_,
|
|
&compact->value_changed_buf_);
|
|
|
|
// new_value_buf_.size() <= to_delete__buf_.size(). "=" iff all
|
|
// kv-pairs in this compaction run needs to be deleted.
|
|
assert(compact->to_delete_buf_.size() ==
|
|
compact->key_buf_.size());
|
|
assert(compact->to_delete_buf_.size() ==
|
|
compact->existing_value_buf_.size());
|
|
assert(compact->to_delete_buf_.size() ==
|
|
compact->value_changed_buf_.size());
|
|
|
|
int new_value_idx = 0;
|
|
for (unsigned int i = 0; i < compact->to_delete_buf_.size(); ++i) {
|
|
if (compact->to_delete_buf_[i]) {
|
|
// update the string buffer directly
|
|
// the Slice buffer points to the updated buffer
|
|
UpdateInternalKey(&compact->key_str_buf_[i][0],
|
|
compact->key_str_buf_[i].size(),
|
|
compact->ikey_buf_[i].sequence,
|
|
kTypeDeletion);
|
|
|
|
// no value associated with delete
|
|
compact->existing_value_buf_[i].clear();
|
|
RecordTick(stats_, COMPACTION_KEY_DROP_USER);
|
|
} else if (compact->value_changed_buf_[i]) {
|
|
compact->existing_value_buf_[i] =
|
|
Slice(compact->new_value_buf_[new_value_idx++]);
|
|
}
|
|
} // for
|
|
}
|
|
|
|
Status DBImpl::DoCompactionWork(CompactionState* compact,
|
|
DeletionState& deletion_state,
|
|
LogBuffer* log_buffer) {
|
|
assert(compact);
|
|
compact->CleanupBatchBuffer();
|
|
compact->CleanupMergedBuffer();
|
|
bool prefix_initialized = false;
|
|
|
|
// Generate file_levels_ for compaction berfore making Iterator
|
|
compact->compaction->GenerateFileLevels();
|
|
int64_t imm_micros = 0; // Micros spent doing imm_ compactions
|
|
ColumnFamilyData* cfd = compact->compaction->column_family_data();
|
|
LogToBuffer(
|
|
log_buffer,
|
|
"[%s] Compacting %d@%d + %d@%d files, score %.2f slots available %d",
|
|
cfd->GetName().c_str(), compact->compaction->num_input_files(0),
|
|
compact->compaction->level(), compact->compaction->num_input_files(1),
|
|
compact->compaction->output_level(), compact->compaction->score(),
|
|
options_.max_background_compactions - bg_compaction_scheduled_);
|
|
char scratch[2345];
|
|
compact->compaction->Summary(scratch, sizeof(scratch));
|
|
LogToBuffer(log_buffer, "[%s] Compaction start summary: %s\n",
|
|
cfd->GetName().c_str(), scratch);
|
|
|
|
assert(cfd->current()->NumLevelFiles(compact->compaction->level()) > 0);
|
|
assert(compact->builder == nullptr);
|
|
assert(!compact->outfile);
|
|
|
|
SequenceNumber visible_at_tip = 0;
|
|
SequenceNumber earliest_snapshot;
|
|
SequenceNumber latest_snapshot = 0;
|
|
snapshots_.getAll(compact->existing_snapshots);
|
|
if (compact->existing_snapshots.size() == 0) {
|
|
// optimize for fast path if there are no snapshots
|
|
visible_at_tip = versions_->LastSequence();
|
|
earliest_snapshot = visible_at_tip;
|
|
} else {
|
|
latest_snapshot = compact->existing_snapshots.back();
|
|
// Add the current seqno as the 'latest' virtual
|
|
// snapshot to the end of this list.
|
|
compact->existing_snapshots.push_back(versions_->LastSequence());
|
|
earliest_snapshot = compact->existing_snapshots[0];
|
|
}
|
|
|
|
// Is this compaction producing files at the bottommost level?
|
|
bool bottommost_level = compact->compaction->BottomMostLevel();
|
|
|
|
// Allocate the output file numbers before we release the lock
|
|
AllocateCompactionOutputFileNumbers(compact);
|
|
|
|
bool is_snapshot_supported = IsSnapshotSupported();
|
|
// Release mutex while we're actually doing the compaction work
|
|
mutex_.Unlock();
|
|
log_buffer->FlushBufferToLog();
|
|
|
|
const uint64_t start_micros = env_->NowMicros();
|
|
unique_ptr<Iterator> input(versions_->MakeInputIterator(compact->compaction));
|
|
input->SeekToFirst();
|
|
shared_ptr<Iterator> backup_input(
|
|
versions_->MakeInputIterator(compact->compaction));
|
|
backup_input->SeekToFirst();
|
|
|
|
Status status;
|
|
ParsedInternalKey ikey;
|
|
std::unique_ptr<CompactionFilterV2> compaction_filter_from_factory_v2
|
|
= nullptr;
|
|
auto context = compact->GetFilterContext();
|
|
compaction_filter_from_factory_v2 =
|
|
cfd->options()->compaction_filter_factory_v2->CreateCompactionFilterV2(
|
|
context);
|
|
auto compaction_filter_v2 =
|
|
compaction_filter_from_factory_v2.get();
|
|
|
|
// temp_backup_input always point to the start of the current buffer
|
|
// temp_backup_input = backup_input;
|
|
// iterate through input,
|
|
// 1) buffer ineligible keys and value keys into 2 separate buffers;
|
|
// 2) send value_buffer to compaction filter and alternate the values;
|
|
// 3) merge value_buffer with ineligible_value_buffer;
|
|
// 4) run the modified "compaction" using the old for loop.
|
|
if (compaction_filter_v2) {
|
|
while (backup_input->Valid() && !shutting_down_.Acquire_Load() &&
|
|
!cfd->IsDropped()) {
|
|
// FLUSH preempts compaction
|
|
// TODO(icanadi) this currently only checks if flush is necessary on
|
|
// compacting column family. we should also check if flush is necessary on
|
|
// other column families, too
|
|
imm_micros += CallFlushDuringCompaction(cfd, deletion_state, log_buffer);
|
|
|
|
Slice key = backup_input->key();
|
|
Slice value = backup_input->value();
|
|
|
|
const SliceTransform* transformer =
|
|
cfd->options()->compaction_filter_factory_v2->GetPrefixExtractor();
|
|
const auto key_prefix = transformer->Transform(key);
|
|
if (!prefix_initialized) {
|
|
compact->cur_prefix_ = key_prefix.ToString();
|
|
prefix_initialized = true;
|
|
}
|
|
if (!ParseInternalKey(key, &ikey)) {
|
|
// log error
|
|
Log(options_.info_log, "[%s] Failed to parse key: %s",
|
|
cfd->GetName().c_str(), key.ToString().c_str());
|
|
continue;
|
|
} else {
|
|
// If the prefix remains the same, keep buffering
|
|
if (key_prefix.compare(Slice(compact->cur_prefix_)) == 0) {
|
|
// Apply the compaction filter V2 to all the kv pairs sharing
|
|
// the same prefix
|
|
if (ikey.type == kTypeValue &&
|
|
(visible_at_tip || ikey.sequence > latest_snapshot)) {
|
|
// Buffer all keys sharing the same prefix for CompactionFilterV2
|
|
// Iterate through keys to check prefix
|
|
compact->BufferKeyValueSlices(key, value);
|
|
} else {
|
|
// buffer ineligible keys
|
|
compact->BufferOtherKeyValueSlices(key, value);
|
|
}
|
|
backup_input->Next();
|
|
continue;
|
|
// finish changing values for eligible keys
|
|
} else {
|
|
// Now prefix changes, this batch is done.
|
|
// Call compaction filter on the buffered values to change the value
|
|
if (compact->key_buf_.size() > 0) {
|
|
CallCompactionFilterV2(compact, compaction_filter_v2);
|
|
}
|
|
compact->cur_prefix_ = key_prefix.ToString();
|
|
}
|
|
}
|
|
|
|
// Merge this batch of data (values + ineligible keys)
|
|
compact->MergeKeyValueSliceBuffer(&cfd->internal_comparator());
|
|
|
|
// Done buffering for the current prefix. Spit it out to disk
|
|
// Now just iterate through all the kv-pairs
|
|
status = ProcessKeyValueCompaction(
|
|
is_snapshot_supported,
|
|
visible_at_tip,
|
|
earliest_snapshot,
|
|
latest_snapshot,
|
|
deletion_state,
|
|
bottommost_level,
|
|
imm_micros,
|
|
input.get(),
|
|
compact,
|
|
true,
|
|
log_buffer);
|
|
|
|
if (!status.ok()) {
|
|
break;
|
|
}
|
|
|
|
// After writing the kv-pairs, we can safely remove the reference
|
|
// to the string buffer and clean them up
|
|
compact->CleanupBatchBuffer();
|
|
compact->CleanupMergedBuffer();
|
|
// Buffer the key that triggers the mismatch in prefix
|
|
if (ikey.type == kTypeValue &&
|
|
(visible_at_tip || ikey.sequence > latest_snapshot)) {
|
|
compact->BufferKeyValueSlices(key, value);
|
|
} else {
|
|
compact->BufferOtherKeyValueSlices(key, value);
|
|
}
|
|
backup_input->Next();
|
|
if (!backup_input->Valid()) {
|
|
// If this is the single last value, we need to merge it.
|
|
if (compact->key_buf_.size() > 0) {
|
|
CallCompactionFilterV2(compact, compaction_filter_v2);
|
|
}
|
|
compact->MergeKeyValueSliceBuffer(&cfd->internal_comparator());
|
|
|
|
status = ProcessKeyValueCompaction(
|
|
is_snapshot_supported,
|
|
visible_at_tip,
|
|
earliest_snapshot,
|
|
latest_snapshot,
|
|
deletion_state,
|
|
bottommost_level,
|
|
imm_micros,
|
|
input.get(),
|
|
compact,
|
|
true,
|
|
log_buffer);
|
|
|
|
compact->CleanupBatchBuffer();
|
|
compact->CleanupMergedBuffer();
|
|
}
|
|
} // done processing all prefix batches
|
|
// finish the last batch
|
|
if (compact->key_buf_.size() > 0) {
|
|
CallCompactionFilterV2(compact, compaction_filter_v2);
|
|
}
|
|
compact->MergeKeyValueSliceBuffer(&cfd->internal_comparator());
|
|
status = ProcessKeyValueCompaction(
|
|
is_snapshot_supported,
|
|
visible_at_tip,
|
|
earliest_snapshot,
|
|
latest_snapshot,
|
|
deletion_state,
|
|
bottommost_level,
|
|
imm_micros,
|
|
input.get(),
|
|
compact,
|
|
true,
|
|
log_buffer);
|
|
} // checking for compaction filter v2
|
|
|
|
if (!compaction_filter_v2) {
|
|
status = ProcessKeyValueCompaction(
|
|
is_snapshot_supported,
|
|
visible_at_tip,
|
|
earliest_snapshot,
|
|
latest_snapshot,
|
|
deletion_state,
|
|
bottommost_level,
|
|
imm_micros,
|
|
input.get(),
|
|
compact,
|
|
false,
|
|
log_buffer);
|
|
}
|
|
|
|
if (status.ok() && (shutting_down_.Acquire_Load() || cfd->IsDropped())) {
|
|
status = Status::ShutdownInProgress(
|
|
"Database shutdown or Column family drop during compaction");
|
|
}
|
|
if (status.ok() && compact->builder != nullptr) {
|
|
status = FinishCompactionOutputFile(compact, input.get());
|
|
}
|
|
if (status.ok()) {
|
|
status = input->status();
|
|
}
|
|
input.reset();
|
|
|
|
if (!options_.disableDataSync) {
|
|
db_directory_->Fsync();
|
|
}
|
|
|
|
InternalStats::CompactionStats stats(1);
|
|
stats.micros = env_->NowMicros() - start_micros - imm_micros;
|
|
stats.files_in_leveln = compact->compaction->num_input_files(0);
|
|
stats.files_in_levelnp1 = compact->compaction->num_input_files(1);
|
|
MeasureTime(stats_, COMPACTION_TIME, stats.micros);
|
|
|
|
int num_output_files = compact->outputs.size();
|
|
if (compact->builder != nullptr) {
|
|
// An error occurred so ignore the last output.
|
|
assert(num_output_files > 0);
|
|
--num_output_files;
|
|
}
|
|
stats.files_out_levelnp1 = num_output_files;
|
|
|
|
for (int i = 0; i < compact->compaction->num_input_files(0); i++) {
|
|
stats.bytes_readn += compact->compaction->input(0, i)->fd.GetFileSize();
|
|
}
|
|
|
|
for (int i = 0; i < compact->compaction->num_input_files(1); i++) {
|
|
stats.bytes_readnp1 += compact->compaction->input(1, i)->fd.GetFileSize();
|
|
}
|
|
|
|
for (int i = 0; i < num_output_files; i++) {
|
|
stats.bytes_written += compact->outputs[i].file_size;
|
|
}
|
|
|
|
RecordCompactionIOStats();
|
|
|
|
LogFlush(options_.info_log);
|
|
mutex_.Lock();
|
|
cfd->internal_stats()->AddCompactionStats(
|
|
compact->compaction->output_level(), stats);
|
|
|
|
// if there were any unused file number (mostly in case of
|
|
// compaction error), free up the entry from pending_putputs
|
|
ReleaseCompactionUnusedFileNumbers(compact);
|
|
|
|
if (status.ok()) {
|
|
status = InstallCompactionResults(compact, log_buffer);
|
|
InstallSuperVersion(cfd, deletion_state);
|
|
}
|
|
Version::LevelSummaryStorage tmp;
|
|
LogToBuffer(
|
|
log_buffer,
|
|
"[%s] compacted to: %s, %.1f MB/sec, level %d, files in(%d, %d) out(%d) "
|
|
"MB in(%.1f, %.1f) out(%.1f), read-write-amplify(%.1f) "
|
|
"write-amplify(%.1f) %s\n",
|
|
cfd->GetName().c_str(), cfd->current()->LevelSummary(&tmp),
|
|
(stats.bytes_readn + stats.bytes_readnp1 + stats.bytes_written) /
|
|
(double)stats.micros,
|
|
compact->compaction->output_level(), stats.files_in_leveln,
|
|
stats.files_in_levelnp1, stats.files_out_levelnp1,
|
|
stats.bytes_readn / 1048576.0, stats.bytes_readnp1 / 1048576.0,
|
|
stats.bytes_written / 1048576.0,
|
|
(stats.bytes_written + stats.bytes_readnp1 + stats.bytes_readn) /
|
|
(double)stats.bytes_readn,
|
|
stats.bytes_written / (double)stats.bytes_readn,
|
|
status.ToString().c_str());
|
|
|
|
return status;
|
|
}
|
|
|
|
namespace {
|
|
struct IterState {
|
|
IterState(DBImpl* db, port::Mutex* mu, SuperVersion* super_version)
|
|
: db(db), mu(mu), super_version(super_version) {}
|
|
|
|
DBImpl* db;
|
|
port::Mutex* mu;
|
|
SuperVersion* super_version;
|
|
};
|
|
|
|
static void CleanupIteratorState(void* arg1, void* arg2) {
|
|
IterState* state = reinterpret_cast<IterState*>(arg1);
|
|
|
|
if (state->super_version->Unref()) {
|
|
DBImpl::DeletionState deletion_state;
|
|
|
|
state->mu->Lock();
|
|
state->super_version->Cleanup();
|
|
state->db->FindObsoleteFiles(deletion_state, false, true);
|
|
state->mu->Unlock();
|
|
|
|
delete state->super_version;
|
|
if (deletion_state.HaveSomethingToDelete()) {
|
|
state->db->PurgeObsoleteFiles(deletion_state);
|
|
}
|
|
}
|
|
|
|
delete state;
|
|
}
|
|
} // namespace
|
|
|
|
Iterator* DBImpl::NewInternalIterator(const ReadOptions& options,
|
|
ColumnFamilyData* cfd,
|
|
SuperVersion* super_version,
|
|
Arena* arena) {
|
|
Iterator* internal_iter;
|
|
if (arena != nullptr) {
|
|
// Need to create internal iterator from the arena.
|
|
MergeIteratorBuilder merge_iter_builder(&cfd->internal_comparator(), arena);
|
|
// Collect iterator for mutable mem
|
|
merge_iter_builder.AddIterator(
|
|
super_version->mem->NewIterator(options, false, arena));
|
|
// Collect all needed child iterators for immutable memtables
|
|
super_version->imm->AddIterators(options, &merge_iter_builder);
|
|
// Collect iterators for files in L0 - Ln
|
|
super_version->current->AddIterators(options, storage_options_,
|
|
&merge_iter_builder);
|
|
internal_iter = merge_iter_builder.Finish();
|
|
} else {
|
|
// Need to create internal iterator using malloc.
|
|
std::vector<Iterator*> iterator_list;
|
|
// Collect iterator for mutable mem
|
|
iterator_list.push_back(super_version->mem->NewIterator(options));
|
|
// Collect all needed child iterators for immutable memtables
|
|
super_version->imm->AddIterators(options, &iterator_list);
|
|
// Collect iterators for files in L0 - Ln
|
|
super_version->current->AddIterators(options, storage_options_,
|
|
&iterator_list);
|
|
internal_iter = NewMergingIterator(&cfd->internal_comparator(),
|
|
&iterator_list[0], iterator_list.size());
|
|
}
|
|
IterState* cleanup = new IterState(this, &mutex_, super_version);
|
|
internal_iter->RegisterCleanup(CleanupIteratorState, cleanup, nullptr);
|
|
|
|
return internal_iter;
|
|
}
|
|
|
|
ColumnFamilyHandle* DBImpl::DefaultColumnFamily() const {
|
|
return default_cf_handle_;
|
|
}
|
|
|
|
Status DBImpl::Get(const ReadOptions& options,
|
|
ColumnFamilyHandle* column_family, const Slice& key,
|
|
std::string* value) {
|
|
return GetImpl(options, column_family, key, value);
|
|
}
|
|
|
|
// DeletionState gets created and destructed outside of the lock -- we
|
|
// use this convinently to:
|
|
// * malloc one SuperVersion() outside of the lock -- new_superversion
|
|
// * delete SuperVersion()s outside of the lock -- superversions_to_free
|
|
//
|
|
// However, if InstallSuperVersion() gets called twice with the same,
|
|
// deletion_state, we can't reuse the SuperVersion() that got malloced because
|
|
// first call already used it. In that rare case, we take a hit and create a
|
|
// new SuperVersion() inside of the mutex. We do similar thing
|
|
// for superversion_to_free
|
|
void DBImpl::InstallSuperVersion(ColumnFamilyData* cfd,
|
|
DeletionState& deletion_state) {
|
|
mutex_.AssertHeld();
|
|
// if new_superversion == nullptr, it means somebody already used it
|
|
SuperVersion* new_superversion =
|
|
(deletion_state.new_superversion != nullptr) ?
|
|
deletion_state.new_superversion : new SuperVersion();
|
|
SuperVersion* old_superversion =
|
|
cfd->InstallSuperVersion(new_superversion, &mutex_);
|
|
deletion_state.new_superversion = nullptr;
|
|
deletion_state.superversions_to_free.push_back(old_superversion);
|
|
}
|
|
|
|
Status DBImpl::GetImpl(const ReadOptions& options,
|
|
ColumnFamilyHandle* column_family, const Slice& key,
|
|
std::string* value, bool* value_found) {
|
|
StopWatch sw(env_, stats_, DB_GET);
|
|
PERF_TIMER_AUTO(get_snapshot_time);
|
|
|
|
auto cfh = reinterpret_cast<ColumnFamilyHandleImpl*>(column_family);
|
|
auto cfd = cfh->cfd();
|
|
|
|
SequenceNumber snapshot;
|
|
if (options.snapshot != nullptr) {
|
|
snapshot = reinterpret_cast<const SnapshotImpl*>(options.snapshot)->number_;
|
|
} else {
|
|
snapshot = versions_->LastSequence();
|
|
}
|
|
|
|
// Acquire SuperVersion
|
|
SuperVersion* sv = nullptr;
|
|
// TODO(ljin): consider using GetReferencedSuperVersion() directly
|
|
if (LIKELY(options_.allow_thread_local)) {
|
|
sv = cfd->GetThreadLocalSuperVersion(&mutex_);
|
|
} else {
|
|
mutex_.Lock();
|
|
sv = cfd->GetSuperVersion()->Ref();
|
|
mutex_.Unlock();
|
|
}
|
|
|
|
// Prepare to store a list of merge operations if merge occurs.
|
|
MergeContext merge_context;
|
|
|
|
Status s;
|
|
// First look in the memtable, then in the immutable memtable (if any).
|
|
// s is both in/out. When in, s could either be OK or MergeInProgress.
|
|
// merge_operands will contain the sequence of merges in the latter case.
|
|
LookupKey lkey(key, snapshot);
|
|
PERF_TIMER_STOP(get_snapshot_time);
|
|
if (sv->mem->Get(lkey, value, &s, merge_context, *cfd->options())) {
|
|
// Done
|
|
RecordTick(stats_, MEMTABLE_HIT);
|
|
} else if (sv->imm->Get(lkey, value, &s, merge_context, *cfd->options())) {
|
|
// Done
|
|
RecordTick(stats_, MEMTABLE_HIT);
|
|
} else {
|
|
PERF_TIMER_START(get_from_output_files_time);
|
|
|
|
sv->current->Get(options, lkey, value, &s, &merge_context, value_found);
|
|
PERF_TIMER_STOP(get_from_output_files_time);
|
|
RecordTick(stats_, MEMTABLE_MISS);
|
|
}
|
|
|
|
PERF_TIMER_START(get_post_process_time);
|
|
|
|
bool unref_sv = true;
|
|
if (LIKELY(options_.allow_thread_local)) {
|
|
unref_sv = !cfd->ReturnThreadLocalSuperVersion(sv);
|
|
}
|
|
|
|
if (unref_sv) {
|
|
// Release SuperVersion
|
|
if (sv->Unref()) {
|
|
mutex_.Lock();
|
|
sv->Cleanup();
|
|
mutex_.Unlock();
|
|
delete sv;
|
|
RecordTick(stats_, NUMBER_SUPERVERSION_CLEANUPS);
|
|
}
|
|
RecordTick(stats_, NUMBER_SUPERVERSION_RELEASES);
|
|
}
|
|
|
|
RecordTick(stats_, NUMBER_KEYS_READ);
|
|
RecordTick(stats_, BYTES_READ, value->size());
|
|
PERF_TIMER_STOP(get_post_process_time);
|
|
return s;
|
|
}
|
|
|
|
std::vector<Status> DBImpl::MultiGet(
|
|
const ReadOptions& options,
|
|
const std::vector<ColumnFamilyHandle*>& column_family,
|
|
const std::vector<Slice>& keys, std::vector<std::string>* values) {
|
|
|
|
StopWatch sw(env_, stats_, DB_MULTIGET);
|
|
PERF_TIMER_AUTO(get_snapshot_time);
|
|
|
|
SequenceNumber snapshot;
|
|
|
|
struct MultiGetColumnFamilyData {
|
|
ColumnFamilyData* cfd;
|
|
SuperVersion* super_version;
|
|
};
|
|
std::unordered_map<uint32_t, MultiGetColumnFamilyData*> multiget_cf_data;
|
|
// fill up and allocate outside of mutex
|
|
for (auto cf : column_family) {
|
|
auto cfh = reinterpret_cast<ColumnFamilyHandleImpl*>(cf);
|
|
auto cfd = cfh->cfd();
|
|
if (multiget_cf_data.find(cfd->GetID()) == multiget_cf_data.end()) {
|
|
auto mgcfd = new MultiGetColumnFamilyData();
|
|
mgcfd->cfd = cfd;
|
|
multiget_cf_data.insert({cfd->GetID(), mgcfd});
|
|
}
|
|
}
|
|
|
|
mutex_.Lock();
|
|
if (options.snapshot != nullptr) {
|
|
snapshot = reinterpret_cast<const SnapshotImpl*>(options.snapshot)->number_;
|
|
} else {
|
|
snapshot = versions_->LastSequence();
|
|
}
|
|
for (auto mgd_iter : multiget_cf_data) {
|
|
mgd_iter.second->super_version =
|
|
mgd_iter.second->cfd->GetSuperVersion()->Ref();
|
|
}
|
|
mutex_.Unlock();
|
|
|
|
// Contain a list of merge operations if merge occurs.
|
|
MergeContext merge_context;
|
|
|
|
// Note: this always resizes the values array
|
|
size_t num_keys = keys.size();
|
|
std::vector<Status> stat_list(num_keys);
|
|
values->resize(num_keys);
|
|
|
|
// Keep track of bytes that we read for statistics-recording later
|
|
uint64_t bytes_read = 0;
|
|
PERF_TIMER_STOP(get_snapshot_time);
|
|
|
|
// For each of the given keys, apply the entire "get" process as follows:
|
|
// First look in the memtable, then in the immutable memtable (if any).
|
|
// s is both in/out. When in, s could either be OK or MergeInProgress.
|
|
// merge_operands will contain the sequence of merges in the latter case.
|
|
for (size_t i = 0; i < num_keys; ++i) {
|
|
merge_context.Clear();
|
|
Status& s = stat_list[i];
|
|
std::string* value = &(*values)[i];
|
|
|
|
LookupKey lkey(keys[i], snapshot);
|
|
auto cfh = reinterpret_cast<ColumnFamilyHandleImpl*>(column_family[i]);
|
|
auto mgd_iter = multiget_cf_data.find(cfh->cfd()->GetID());
|
|
assert(mgd_iter != multiget_cf_data.end());
|
|
auto mgd = mgd_iter->second;
|
|
auto super_version = mgd->super_version;
|
|
auto cfd = mgd->cfd;
|
|
if (super_version->mem->Get(lkey, value, &s, merge_context,
|
|
*cfd->options())) {
|
|
// Done
|
|
} else if (super_version->imm->Get(lkey, value, &s, merge_context,
|
|
*cfd->options())) {
|
|
// Done
|
|
} else {
|
|
super_version->current->Get(options, lkey, value, &s, &merge_context);
|
|
}
|
|
|
|
if (s.ok()) {
|
|
bytes_read += value->size();
|
|
}
|
|
}
|
|
|
|
// Post processing (decrement reference counts and record statistics)
|
|
PERF_TIMER_START(get_post_process_time);
|
|
autovector<SuperVersion*> superversions_to_delete;
|
|
|
|
// TODO(icanadi) do we need lock here or just around Cleanup()?
|
|
mutex_.Lock();
|
|
for (auto mgd_iter : multiget_cf_data) {
|
|
auto mgd = mgd_iter.second;
|
|
if (mgd->super_version->Unref()) {
|
|
mgd->super_version->Cleanup();
|
|
superversions_to_delete.push_back(mgd->super_version);
|
|
}
|
|
}
|
|
mutex_.Unlock();
|
|
|
|
for (auto td : superversions_to_delete) {
|
|
delete td;
|
|
}
|
|
for (auto mgd : multiget_cf_data) {
|
|
delete mgd.second;
|
|
}
|
|
|
|
RecordTick(stats_, NUMBER_MULTIGET_CALLS);
|
|
RecordTick(stats_, NUMBER_MULTIGET_KEYS_READ, num_keys);
|
|
RecordTick(stats_, NUMBER_MULTIGET_BYTES_READ, bytes_read);
|
|
PERF_TIMER_STOP(get_post_process_time);
|
|
|
|
return stat_list;
|
|
}
|
|
|
|
Status DBImpl::CreateColumnFamily(const ColumnFamilyOptions& options,
|
|
const std::string& column_family_name,
|
|
ColumnFamilyHandle** handle) {
|
|
*handle = nullptr;
|
|
MutexLock l(&mutex_);
|
|
|
|
if (versions_->GetColumnFamilySet()->GetColumnFamily(column_family_name) !=
|
|
nullptr) {
|
|
return Status::InvalidArgument("Column family already exists");
|
|
}
|
|
VersionEdit edit;
|
|
edit.AddColumnFamily(column_family_name);
|
|
uint32_t new_id = versions_->GetColumnFamilySet()->GetNextColumnFamilyID();
|
|
edit.SetColumnFamily(new_id);
|
|
edit.SetLogNumber(logfile_number_);
|
|
edit.SetComparatorName(options.comparator->Name());
|
|
|
|
// LogAndApply will both write the creation in MANIFEST and create
|
|
// ColumnFamilyData object
|
|
Status s = versions_->LogAndApply(nullptr, &edit, &mutex_,
|
|
db_directory_.get(), false, &options);
|
|
if (s.ok()) {
|
|
single_column_family_mode_ = false;
|
|
auto cfd =
|
|
versions_->GetColumnFamilySet()->GetColumnFamily(column_family_name);
|
|
assert(cfd != nullptr);
|
|
delete cfd->InstallSuperVersion(new SuperVersion(), &mutex_);
|
|
*handle = new ColumnFamilyHandleImpl(cfd, this, &mutex_);
|
|
Log(options_.info_log, "Created column family [%s] (ID %u)",
|
|
column_family_name.c_str(), (unsigned)cfd->GetID());
|
|
max_total_in_memory_state_ += cfd->options()->write_buffer_size *
|
|
cfd->options()->max_write_buffer_number;
|
|
} else {
|
|
Log(options_.info_log, "Creating column family [%s] FAILED -- %s",
|
|
column_family_name.c_str(), s.ToString().c_str());
|
|
}
|
|
return s;
|
|
}
|
|
|
|
Status DBImpl::DropColumnFamily(ColumnFamilyHandle* column_family) {
|
|
auto cfh = reinterpret_cast<ColumnFamilyHandleImpl*>(column_family);
|
|
auto cfd = cfh->cfd();
|
|
if (cfd->GetID() == 0) {
|
|
return Status::InvalidArgument("Can't drop default column family");
|
|
}
|
|
|
|
VersionEdit edit;
|
|
edit.DropColumnFamily();
|
|
edit.SetColumnFamily(cfd->GetID());
|
|
|
|
Status s;
|
|
{
|
|
MutexLock l(&mutex_);
|
|
if (cfd->IsDropped()) {
|
|
s = Status::InvalidArgument("Column family already dropped!\n");
|
|
}
|
|
if (s.ok()) {
|
|
s = versions_->LogAndApply(cfd, &edit, &mutex_);
|
|
}
|
|
}
|
|
|
|
if (s.ok()) {
|
|
assert(cfd->IsDropped());
|
|
max_total_in_memory_state_ -= cfd->options()->write_buffer_size *
|
|
cfd->options()->max_write_buffer_number;
|
|
Log(options_.info_log, "Dropped column family with id %u\n", cfd->GetID());
|
|
// Flush the memtables. This will make all WAL files referencing dropped
|
|
// column family to be obsolete. They will be deleted once user deletes
|
|
// column family handle
|
|
Write(WriteOptions(), nullptr); // ignore error
|
|
} else {
|
|
Log(options_.info_log, "Dropping column family with id %u FAILED -- %s\n",
|
|
cfd->GetID(), s.ToString().c_str());
|
|
}
|
|
|
|
return s;
|
|
}
|
|
|
|
bool DBImpl::KeyMayExist(const ReadOptions& options,
|
|
ColumnFamilyHandle* column_family, const Slice& key,
|
|
std::string* value, bool* value_found) {
|
|
if (value_found != nullptr) {
|
|
// falsify later if key-may-exist but can't fetch value
|
|
*value_found = true;
|
|
}
|
|
ReadOptions roptions = options;
|
|
roptions.read_tier = kBlockCacheTier; // read from block cache only
|
|
auto s = GetImpl(roptions, column_family, key, value, value_found);
|
|
|
|
// If options.block_cache != nullptr and the index block of the table didn't
|
|
// not present in block_cache, the return value will be Status::Incomplete.
|
|
// In this case, key may still exist in the table.
|
|
return s.ok() || s.IsIncomplete();
|
|
}
|
|
|
|
Iterator* DBImpl::NewIterator(const ReadOptions& options,
|
|
ColumnFamilyHandle* column_family) {
|
|
auto cfh = reinterpret_cast<ColumnFamilyHandleImpl*>(column_family);
|
|
auto cfd = cfh->cfd();
|
|
|
|
if (options.tailing) {
|
|
#ifdef ROCKSDB_LITE
|
|
// not supported in lite version
|
|
return nullptr;
|
|
#else
|
|
// TODO(ljin): remove tailing iterator
|
|
auto iter = new ForwardIterator(this, options, cfd);
|
|
return NewDBIterator(env_, *cfd->options(), cfd->user_comparator(), iter,
|
|
kMaxSequenceNumber);
|
|
// return new TailingIterator(env_, this, options, cfd);
|
|
#endif
|
|
} else {
|
|
SequenceNumber latest_snapshot = versions_->LastSequence();
|
|
SuperVersion* sv = nullptr;
|
|
sv = cfd->GetReferencedSuperVersion(&mutex_);
|
|
|
|
auto snapshot =
|
|
options.snapshot != nullptr
|
|
? reinterpret_cast<const SnapshotImpl*>(options.snapshot)->number_
|
|
: latest_snapshot;
|
|
|
|
// Try to generate a DB iterator tree in continuous memory area to be
|
|
// cache friendly. Here is an example of result:
|
|
// +-------------------------------+
|
|
// | |
|
|
// | ArenaWrappedDBIter |
|
|
// | + |
|
|
// | +---> Inner Iterator ------------+
|
|
// | | | |
|
|
// | | +-- -- -- -- -- -- -- --+ |
|
|
// | +--- | Arena | |
|
|
// | | | |
|
|
// | Allocated Memory: | |
|
|
// | | +-------------------+ |
|
|
// | | | DBIter | <---+
|
|
// | | + |
|
|
// | | | +-> iter_ ------------+
|
|
// | | | | |
|
|
// | | +-------------------+ |
|
|
// | | | MergingIterator | <---+
|
|
// | | + |
|
|
// | | | +->child iter1 ------------+
|
|
// | | | | | |
|
|
// | | +->child iter2 ----------+ |
|
|
// | | | | | | |
|
|
// | | | +->child iter3 --------+ | |
|
|
// | | | | | |
|
|
// | | +-------------------+ | | |
|
|
// | | | Iterator1 | <--------+
|
|
// | | +-------------------+ | |
|
|
// | | | Iterator2 | <------+
|
|
// | | +-------------------+ |
|
|
// | | | Iterator3 | <----+
|
|
// | | +-------------------+
|
|
// | | |
|
|
// +-------+-----------------------+
|
|
//
|
|
// ArenaWrappedDBIter inlines an arena area where all the iterartor in the
|
|
// the iterator tree is allocated in the order of being accessed when
|
|
// querying.
|
|
// Laying out the iterators in the order of being accessed makes it more
|
|
// likely that any iterator pointer is close to the iterator it points to so
|
|
// that they are likely to be in the same cache line and/or page.
|
|
ArenaWrappedDBIter* db_iter = NewArenaWrappedDbIterator(
|
|
env_, *cfd->options(), cfd->user_comparator(), snapshot);
|
|
Iterator* internal_iter =
|
|
NewInternalIterator(options, cfd, sv, db_iter->GetArena());
|
|
db_iter->SetIterUnderDBIter(internal_iter);
|
|
|
|
return db_iter;
|
|
}
|
|
}
|
|
|
|
Status DBImpl::NewIterators(
|
|
const ReadOptions& options,
|
|
const std::vector<ColumnFamilyHandle*>& column_families,
|
|
std::vector<Iterator*>* iterators) {
|
|
iterators->clear();
|
|
iterators->reserve(column_families.size());
|
|
SequenceNumber latest_snapshot = 0;
|
|
std::vector<SuperVersion*> super_versions;
|
|
super_versions.reserve(column_families.size());
|
|
|
|
if (!options.tailing) {
|
|
mutex_.Lock();
|
|
latest_snapshot = versions_->LastSequence();
|
|
for (auto cfh : column_families) {
|
|
auto cfd = reinterpret_cast<ColumnFamilyHandleImpl*>(cfh)->cfd();
|
|
super_versions.push_back(cfd->GetSuperVersion()->Ref());
|
|
}
|
|
mutex_.Unlock();
|
|
}
|
|
|
|
if (options.tailing) {
|
|
#ifdef ROCKSDB_LITE
|
|
return Status::InvalidArgument(
|
|
"Tailing interator not supported in RocksDB lite");
|
|
#else
|
|
for (auto cfh : column_families) {
|
|
auto cfd = reinterpret_cast<ColumnFamilyHandleImpl*>(cfh)->cfd();
|
|
iterators->push_back(new TailingIterator(env_, this, options, cfd));
|
|
}
|
|
#endif
|
|
} else {
|
|
for (size_t i = 0; i < column_families.size(); ++i) {
|
|
auto cfh = reinterpret_cast<ColumnFamilyHandleImpl*>(column_families[i]);
|
|
auto cfd = cfh->cfd();
|
|
|
|
auto snapshot =
|
|
options.snapshot != nullptr
|
|
? reinterpret_cast<const SnapshotImpl*>(options.snapshot)->number_
|
|
: latest_snapshot;
|
|
|
|
auto iter = NewInternalIterator(options, cfd, super_versions[i]);
|
|
iter = NewDBIterator(env_, *cfd->options(),
|
|
cfd->user_comparator(), iter, snapshot);
|
|
iterators->push_back(iter);
|
|
}
|
|
}
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
bool DBImpl::IsSnapshotSupported() const {
|
|
for (auto cfd : *versions_->GetColumnFamilySet()) {
|
|
if (!cfd->mem()->IsSnapshotSupported()) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
const Snapshot* DBImpl::GetSnapshot() {
|
|
MutexLock l(&mutex_);
|
|
// returns null if the underlying memtable does not support snapshot.
|
|
if (!IsSnapshotSupported()) return nullptr;
|
|
return snapshots_.New(versions_->LastSequence());
|
|
}
|
|
|
|
void DBImpl::ReleaseSnapshot(const Snapshot* s) {
|
|
MutexLock l(&mutex_);
|
|
snapshots_.Delete(reinterpret_cast<const SnapshotImpl*>(s));
|
|
}
|
|
|
|
// Convenience methods
|
|
Status DBImpl::Put(const WriteOptions& o, ColumnFamilyHandle* column_family,
|
|
const Slice& key, const Slice& val) {
|
|
return DB::Put(o, column_family, key, val);
|
|
}
|
|
|
|
Status DBImpl::Merge(const WriteOptions& o, ColumnFamilyHandle* column_family,
|
|
const Slice& key, const Slice& val) {
|
|
auto cfh = reinterpret_cast<ColumnFamilyHandleImpl*>(column_family);
|
|
if (!cfh->cfd()->options()->merge_operator) {
|
|
return Status::NotSupported("Provide a merge_operator when opening DB");
|
|
} else {
|
|
return DB::Merge(o, column_family, key, val);
|
|
}
|
|
}
|
|
|
|
Status DBImpl::Delete(const WriteOptions& options,
|
|
ColumnFamilyHandle* column_family, const Slice& key) {
|
|
return DB::Delete(options, column_family, key);
|
|
}
|
|
|
|
Status DBImpl::Write(const WriteOptions& options, WriteBatch* my_batch) {
|
|
PERF_TIMER_AUTO(write_pre_and_post_process_time);
|
|
Writer w(&mutex_);
|
|
w.batch = my_batch;
|
|
w.sync = options.sync;
|
|
w.disableWAL = options.disableWAL;
|
|
w.in_batch_group = false;
|
|
w.done = false;
|
|
w.timeout_hint_us = options.timeout_hint_us;
|
|
|
|
uint64_t expiration_time = 0;
|
|
if (w.timeout_hint_us == 0) {
|
|
w.timeout_hint_us = kNoTimeOut;
|
|
} else {
|
|
expiration_time = env_->NowMicros() + w.timeout_hint_us;
|
|
}
|
|
w.done = false;
|
|
|
|
mutex_.Lock();
|
|
// the following code block pushes the current writer "w" into the writer
|
|
// queue "writers_" and wait until one of the following conditions met:
|
|
// 1. the job of "w" has been done by some other writers.
|
|
// 2. "w" becomes the first writer in "writers_"
|
|
// 3. "w" timed-out.
|
|
writers_.push_back(&w);
|
|
|
|
bool timed_out = false;
|
|
while (!w.done && &w != writers_.front()) {
|
|
if (expiration_time == 0) {
|
|
w.cv.Wait();
|
|
} else if (w.cv.TimedWait(expiration_time)) {
|
|
if (w.in_batch_group) {
|
|
// then it means the front writer is currently doing the
|
|
// write on behalf of this "timed-out" writer. Then it
|
|
// should wait until the write completes.
|
|
expiration_time = 0;
|
|
} else {
|
|
timed_out = true;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!options.disableWAL) {
|
|
RecordTick(stats_, WRITE_WITH_WAL);
|
|
default_cf_internal_stats_->AddDBStats(
|
|
InternalStats::WRITE_WITH_WAL, 1);
|
|
}
|
|
|
|
if (w.done) {
|
|
default_cf_internal_stats_->AddDBStats(
|
|
InternalStats::WRITE_DONE_BY_OTHER, 1);
|
|
mutex_.Unlock();
|
|
RecordTick(stats_, WRITE_DONE_BY_OTHER);
|
|
return w.status;
|
|
} else if (timed_out) {
|
|
#ifndef NDEBUG
|
|
bool found = false;
|
|
#endif
|
|
for (auto iter = writers_.begin(); iter != writers_.end(); iter++) {
|
|
if (*iter == &w) {
|
|
writers_.erase(iter);
|
|
#ifndef NDEBUG
|
|
found = true;
|
|
#endif
|
|
break;
|
|
}
|
|
}
|
|
#ifndef NDEBUG
|
|
assert(found);
|
|
#endif
|
|
// writers_.front() might still be in cond_wait without a time-out.
|
|
// As a result, we need to signal it to wake it up. Otherwise no
|
|
// one else will wake him up, and RocksDB will hang.
|
|
if (!writers_.empty()) {
|
|
writers_.front()->cv.Signal();
|
|
}
|
|
mutex_.Unlock();
|
|
RecordTick(stats_, WRITE_TIMEDOUT);
|
|
return Status::TimedOut();
|
|
} else {
|
|
RecordTick(stats_, WRITE_DONE_BY_SELF);
|
|
default_cf_internal_stats_->AddDBStats(
|
|
InternalStats::WRITE_DONE_BY_SELF, 1);
|
|
}
|
|
|
|
// Once reaches this point, the current writer "w" will try to do its write
|
|
// job. It may also pick up some of the remaining writers in the "writers_"
|
|
// when it finds suitable, and finish them in the same write batch.
|
|
// This is how a write job could be done by the other writer.
|
|
assert(!single_column_family_mode_ ||
|
|
versions_->GetColumnFamilySet()->NumberOfColumnFamilies() == 1);
|
|
|
|
uint64_t flush_column_family_if_log_file = 0;
|
|
uint64_t max_total_wal_size = (options_.max_total_wal_size == 0)
|
|
? 4 * max_total_in_memory_state_
|
|
: options_.max_total_wal_size;
|
|
if (UNLIKELY(!single_column_family_mode_) &&
|
|
alive_log_files_.begin()->getting_flushed == false &&
|
|
total_log_size_ > max_total_wal_size) {
|
|
flush_column_family_if_log_file = alive_log_files_.begin()->number;
|
|
alive_log_files_.begin()->getting_flushed = true;
|
|
Log(options_.info_log,
|
|
"Flushing all column families with data in WAL number %" PRIu64
|
|
". Total log size is %" PRIu64 " while max_total_wal_size is %" PRIu64,
|
|
flush_column_family_if_log_file, total_log_size_, max_total_wal_size);
|
|
}
|
|
|
|
Status status;
|
|
autovector<SuperVersion*> superversions_to_free;
|
|
autovector<log::Writer*> logs_to_free;
|
|
|
|
if (LIKELY(single_column_family_mode_)) {
|
|
// fast path
|
|
status = MakeRoomForWrite(
|
|
default_cf_handle_->cfd(), my_batch == nullptr,
|
|
&superversions_to_free, &logs_to_free,
|
|
expiration_time);
|
|
} else {
|
|
// refcounting cfd in iteration
|
|
bool dead_cfd = false;
|
|
for (auto cfd : *versions_->GetColumnFamilySet()) {
|
|
cfd->Ref();
|
|
bool force_flush =
|
|
my_batch == nullptr ||
|
|
(flush_column_family_if_log_file != 0 &&
|
|
cfd->GetLogNumber() <= flush_column_family_if_log_file);
|
|
// May temporarily unlock and wait.
|
|
status = MakeRoomForWrite(
|
|
cfd, force_flush, &superversions_to_free, &logs_to_free,
|
|
expiration_time);
|
|
if (cfd->Unref()) {
|
|
dead_cfd = true;
|
|
}
|
|
if (!status.ok()) {
|
|
break;
|
|
}
|
|
}
|
|
if (dead_cfd) {
|
|
versions_->GetColumnFamilySet()->FreeDeadColumnFamilies();
|
|
}
|
|
}
|
|
|
|
uint64_t last_sequence = versions_->LastSequence();
|
|
Writer* last_writer = &w;
|
|
if (status.ok() && my_batch != nullptr) { // nullptr batch is for compactions
|
|
autovector<WriteBatch*> write_batch_group;
|
|
BuildBatchGroup(&last_writer, &write_batch_group);
|
|
|
|
// Add to log and apply to memtable. We can release the lock
|
|
// during this phase since &w is currently responsible for logging
|
|
// and protects against concurrent loggers and concurrent writes
|
|
// into memtables
|
|
{
|
|
mutex_.Unlock();
|
|
WriteBatch* updates = nullptr;
|
|
if (write_batch_group.size() == 1) {
|
|
updates = write_batch_group[0];
|
|
} else {
|
|
updates = &tmp_batch_;
|
|
for (size_t i = 0; i < write_batch_group.size(); ++i) {
|
|
WriteBatchInternal::Append(updates, write_batch_group[i]);
|
|
}
|
|
}
|
|
|
|
const SequenceNumber current_sequence = last_sequence + 1;
|
|
WriteBatchInternal::SetSequence(updates, current_sequence);
|
|
int my_batch_count = WriteBatchInternal::Count(updates);
|
|
last_sequence += my_batch_count;
|
|
const uint64_t batch_size = WriteBatchInternal::ByteSize(updates);
|
|
// Record statistics
|
|
RecordTick(stats_, NUMBER_KEYS_WRITTEN, my_batch_count);
|
|
RecordTick(stats_, BYTES_WRITTEN, WriteBatchInternal::ByteSize(updates));
|
|
if (options.disableWAL) {
|
|
flush_on_destroy_ = true;
|
|
}
|
|
PERF_TIMER_STOP(write_pre_and_post_process_time);
|
|
|
|
uint64_t log_size = 0;
|
|
if (!options.disableWAL) {
|
|
PERF_TIMER_START(write_wal_time);
|
|
Slice log_entry = WriteBatchInternal::Contents(updates);
|
|
status = log_->AddRecord(log_entry);
|
|
total_log_size_ += log_entry.size();
|
|
alive_log_files_.back().AddSize(log_entry.size());
|
|
log_empty_ = false;
|
|
log_size = log_entry.size();
|
|
RecordTick(stats_, WAL_FILE_SYNCED);
|
|
RecordTick(stats_, WAL_FILE_BYTES, log_size);
|
|
if (status.ok() && options.sync) {
|
|
if (options_.use_fsync) {
|
|
StopWatch(env_, stats_, WAL_FILE_SYNC_MICROS);
|
|
status = log_->file()->Fsync();
|
|
} else {
|
|
StopWatch(env_, stats_, WAL_FILE_SYNC_MICROS);
|
|
status = log_->file()->Sync();
|
|
}
|
|
}
|
|
PERF_TIMER_STOP(write_wal_time);
|
|
}
|
|
if (status.ok()) {
|
|
PERF_TIMER_START(write_memtable_time);
|
|
|
|
status = WriteBatchInternal::InsertInto(
|
|
updates, column_family_memtables_.get(), false, 0, this, false);
|
|
// A non-OK status here indicates iteration failure (either in-memory
|
|
// writebatch corruption (very bad), or the client specified invalid
|
|
// column family). This will later on trigger bg_error_.
|
|
//
|
|
// Note that existing logic was not sound. Any partial failure writing
|
|
// into the memtable would result in a state that some write ops might
|
|
// have succeeded in memtable but Status reports error for all writes.
|
|
|
|
PERF_TIMER_STOP(write_memtable_time);
|
|
|
|
SetTickerCount(stats_, SEQUENCE_NUMBER, last_sequence);
|
|
}
|
|
PERF_TIMER_START(write_pre_and_post_process_time);
|
|
if (updates == &tmp_batch_) {
|
|
tmp_batch_.Clear();
|
|
}
|
|
mutex_.Lock();
|
|
// internal stats
|
|
default_cf_internal_stats_->AddDBStats(
|
|
InternalStats::BYTES_WRITTEN, batch_size);
|
|
if (!options.disableWAL) {
|
|
default_cf_internal_stats_->AddDBStats(
|
|
InternalStats::WAL_FILE_SYNCED, 1);
|
|
default_cf_internal_stats_->AddDBStats(
|
|
InternalStats::WAL_FILE_BYTES, log_size);
|
|
}
|
|
if (status.ok()) {
|
|
versions_->SetLastSequence(last_sequence);
|
|
}
|
|
}
|
|
}
|
|
if (options_.paranoid_checks && !status.ok() &&
|
|
!status.IsTimedOut() && bg_error_.ok()) {
|
|
bg_error_ = status; // stop compaction & fail any further writes
|
|
}
|
|
|
|
// Pop out the current writer and all writers being pushed before the
|
|
// current writer from the writer queue.
|
|
while (!writers_.empty()) {
|
|
Writer* ready = writers_.front();
|
|
writers_.pop_front();
|
|
if (ready != &w) {
|
|
ready->status = status;
|
|
ready->done = true;
|
|
ready->cv.Signal();
|
|
}
|
|
if (ready == last_writer) break;
|
|
}
|
|
|
|
// Notify new head of write queue
|
|
if (!writers_.empty()) {
|
|
writers_.front()->cv.Signal();
|
|
}
|
|
mutex_.Unlock();
|
|
|
|
if (status.IsTimedOut()) {
|
|
RecordTick(stats_, WRITE_TIMEDOUT);
|
|
}
|
|
|
|
for (auto& sv : superversions_to_free) {
|
|
delete sv;
|
|
}
|
|
for (auto& log : logs_to_free) {
|
|
delete log;
|
|
}
|
|
|
|
PERF_TIMER_STOP(write_pre_and_post_process_time);
|
|
return status;
|
|
}
|
|
|
|
// This function will be called only when the first writer succeeds.
|
|
// All writers in the to-be-built batch group will be processed.
|
|
//
|
|
// REQUIRES: Writer list must be non-empty
|
|
// REQUIRES: First writer must have a non-nullptr batch
|
|
void DBImpl::BuildBatchGroup(Writer** last_writer,
|
|
autovector<WriteBatch*>* write_batch_group) {
|
|
assert(!writers_.empty());
|
|
Writer* first = writers_.front();
|
|
assert(first->batch != nullptr);
|
|
|
|
size_t size = WriteBatchInternal::ByteSize(first->batch);
|
|
write_batch_group->push_back(first->batch);
|
|
|
|
// Allow the group to grow up to a maximum size, but if the
|
|
// original write is small, limit the growth so we do not slow
|
|
// down the small write too much.
|
|
size_t max_size = 1 << 20;
|
|
if (size <= (128<<10)) {
|
|
max_size = size + (128<<10);
|
|
}
|
|
|
|
*last_writer = first;
|
|
std::deque<Writer*>::iterator iter = writers_.begin();
|
|
++iter; // Advance past "first"
|
|
for (; iter != writers_.end(); ++iter) {
|
|
Writer* w = *iter;
|
|
if (w->sync && !first->sync) {
|
|
// Do not include a sync write into a batch handled by a non-sync write.
|
|
break;
|
|
}
|
|
|
|
if (!w->disableWAL && first->disableWAL) {
|
|
// Do not include a write that needs WAL into a batch that has
|
|
// WAL disabled.
|
|
break;
|
|
}
|
|
|
|
if (w->timeout_hint_us < first->timeout_hint_us) {
|
|
// Do not include those writes with shorter timeout. Otherwise, we might
|
|
// execute a write that should instead be aborted because of timeout.
|
|
break;
|
|
}
|
|
|
|
if (w->batch != nullptr) {
|
|
size += WriteBatchInternal::ByteSize(w->batch);
|
|
if (size > max_size) {
|
|
// Do not make batch too big
|
|
break;
|
|
}
|
|
|
|
write_batch_group->push_back(w->batch);
|
|
}
|
|
w->in_batch_group = true;
|
|
*last_writer = w;
|
|
}
|
|
}
|
|
|
|
// This function computes the amount of time in microseconds by which a write
|
|
// should be delayed based on the number of level-0 files according to the
|
|
// following formula:
|
|
// if n < bottom, return 0;
|
|
// if n >= top, return 1000;
|
|
// otherwise, let r = (n - bottom) /
|
|
// (top - bottom)
|
|
// and return r^2 * 1000.
|
|
// The goal of this formula is to gradually increase the rate at which writes
|
|
// are slowed. We also tried linear delay (r * 1000), but it seemed to do
|
|
// slightly worse. There is no other particular reason for choosing quadratic.
|
|
uint64_t DBImpl::SlowdownAmount(int n, double bottom, double top) {
|
|
uint64_t delay;
|
|
if (n >= top) {
|
|
delay = 1000;
|
|
}
|
|
else if (n < bottom) {
|
|
delay = 0;
|
|
}
|
|
else {
|
|
// If we are here, we know that:
|
|
// level0_start_slowdown <= n < level0_slowdown
|
|
// since the previous two conditions are false.
|
|
double how_much =
|
|
(double) (n - bottom) /
|
|
(top - bottom);
|
|
delay = std::max(how_much * how_much * 1000, 100.0);
|
|
}
|
|
assert(delay <= 1000);
|
|
return delay;
|
|
}
|
|
|
|
// REQUIRES: mutex_ is held
|
|
// REQUIRES: this thread is currently at the front of the writer queue
|
|
Status DBImpl::MakeRoomForWrite(
|
|
ColumnFamilyData* cfd, bool force,
|
|
autovector<SuperVersion*>* superversions_to_free,
|
|
autovector<log::Writer*>* logs_to_free,
|
|
uint64_t expiration_time) {
|
|
mutex_.AssertHeld();
|
|
assert(!writers_.empty());
|
|
bool allow_delay = !force;
|
|
bool allow_hard_rate_limit_delay = !force;
|
|
bool allow_soft_rate_limit_delay = !force;
|
|
uint64_t rate_limit_delay_millis = 0;
|
|
Status s;
|
|
double score;
|
|
// Once we schedule background work, we shouldn't schedule it again, since it
|
|
// might generate a tight feedback loop, constantly scheduling more background
|
|
// work, even if additional background work is not needed
|
|
bool schedule_background_work = true;
|
|
bool has_timeout = (expiration_time > 0);
|
|
|
|
while (true) {
|
|
if (!bg_error_.ok()) {
|
|
// Yield previous error
|
|
s = bg_error_;
|
|
break;
|
|
} else if (has_timeout && env_->NowMicros() > expiration_time) {
|
|
s = Status::TimedOut();
|
|
break;
|
|
} else if (allow_delay && cfd->NeedSlowdownForNumLevel0Files()) {
|
|
// We are getting close to hitting a hard limit on the number of
|
|
// L0 files. Rather than delaying a single write by several
|
|
// seconds when we hit the hard limit, start delaying each
|
|
// individual write by 0-1ms to reduce latency variance. Also,
|
|
// this delay hands over some CPU to the compaction thread in
|
|
// case it is sharing the same core as the writer.
|
|
uint64_t slowdown =
|
|
SlowdownAmount(cfd->current()->NumLevelFiles(0),
|
|
cfd->options()->level0_slowdown_writes_trigger,
|
|
cfd->options()->level0_stop_writes_trigger);
|
|
mutex_.Unlock();
|
|
uint64_t delayed;
|
|
{
|
|
StopWatch sw(env_, stats_, STALL_L0_SLOWDOWN_COUNT, &delayed);
|
|
env_->SleepForMicroseconds(slowdown);
|
|
}
|
|
RecordTick(stats_, STALL_L0_SLOWDOWN_MICROS, delayed);
|
|
allow_delay = false; // Do not delay a single write more than once
|
|
mutex_.Lock();
|
|
cfd->internal_stats()->AddCFStats(
|
|
InternalStats::LEVEL0_SLOWDOWN, delayed);
|
|
delayed_writes_++;
|
|
} else if (!force && !cfd->mem()->ShouldFlush()) {
|
|
// There is room in current memtable
|
|
if (allow_delay) {
|
|
DelayLoggingAndReset();
|
|
}
|
|
break;
|
|
} else if (cfd->NeedWaitForNumMemtables()) {
|
|
// We have filled up the current memtable, but the previous
|
|
// ones are still being flushed, so we wait.
|
|
DelayLoggingAndReset();
|
|
Log(options_.info_log, "[%s] wait for memtable flush...\n",
|
|
cfd->GetName().c_str());
|
|
if (schedule_background_work) {
|
|
MaybeScheduleFlushOrCompaction();
|
|
schedule_background_work = false;
|
|
}
|
|
uint64_t stall;
|
|
{
|
|
StopWatch sw(env_, stats_, STALL_MEMTABLE_COMPACTION_COUNT, &stall);
|
|
if (!has_timeout) {
|
|
bg_cv_.Wait();
|
|
} else {
|
|
bg_cv_.TimedWait(expiration_time);
|
|
}
|
|
}
|
|
RecordTick(stats_, STALL_MEMTABLE_COMPACTION_MICROS, stall);
|
|
cfd->internal_stats()->AddCFStats(
|
|
InternalStats::MEMTABLE_COMPACTION, stall);
|
|
} else if (cfd->NeedWaitForNumLevel0Files()) {
|
|
DelayLoggingAndReset();
|
|
Log(options_.info_log, "[%s] wait for fewer level0 files...\n",
|
|
cfd->GetName().c_str());
|
|
uint64_t stall;
|
|
{
|
|
StopWatch sw(env_, stats_, STALL_L0_NUM_FILES_COUNT, &stall);
|
|
if (!has_timeout) {
|
|
bg_cv_.Wait();
|
|
} else {
|
|
bg_cv_.TimedWait(expiration_time);
|
|
}
|
|
}
|
|
RecordTick(stats_, STALL_L0_NUM_FILES_MICROS, stall);
|
|
cfd->internal_stats()->AddCFStats(
|
|
InternalStats::LEVEL0_NUM_FILES, stall);
|
|
} else if (allow_hard_rate_limit_delay && cfd->ExceedsHardRateLimit()) {
|
|
// Delay a write when the compaction score for any level is too large.
|
|
const int max_level = cfd->current()->MaxCompactionScoreLevel();
|
|
score = cfd->current()->MaxCompactionScore();
|
|
mutex_.Unlock();
|
|
uint64_t delayed;
|
|
{
|
|
StopWatch sw(env_, stats_, HARD_RATE_LIMIT_DELAY_COUNT, &delayed);
|
|
env_->SleepForMicroseconds(1000);
|
|
}
|
|
// Make sure the following value doesn't round to zero.
|
|
uint64_t rate_limit = std::max((delayed / 1000), (uint64_t) 1);
|
|
rate_limit_delay_millis += rate_limit;
|
|
RecordTick(stats_, RATE_LIMIT_DELAY_MILLIS, rate_limit);
|
|
if (cfd->options()->rate_limit_delay_max_milliseconds > 0 &&
|
|
rate_limit_delay_millis >=
|
|
(unsigned)cfd->options()->rate_limit_delay_max_milliseconds) {
|
|
allow_hard_rate_limit_delay = false;
|
|
}
|
|
mutex_.Lock();
|
|
cfd->internal_stats()->RecordLevelNSlowdown(max_level, delayed, false);
|
|
} else if (allow_soft_rate_limit_delay && cfd->ExceedsSoftRateLimit()) {
|
|
const int max_level = cfd->current()->MaxCompactionScoreLevel();
|
|
score = cfd->current()->MaxCompactionScore();
|
|
// Delay a write when the compaction score for any level is too large.
|
|
// TODO: add statistics
|
|
uint64_t slowdown = SlowdownAmount(score, cfd->options()->soft_rate_limit,
|
|
cfd->options()->hard_rate_limit);
|
|
uint64_t elapsed = 0;
|
|
mutex_.Unlock();
|
|
{
|
|
StopWatch sw(env_, stats_, SOFT_RATE_LIMIT_DELAY_COUNT, &elapsed);
|
|
env_->SleepForMicroseconds(slowdown);
|
|
rate_limit_delay_millis += slowdown;
|
|
}
|
|
allow_soft_rate_limit_delay = false;
|
|
mutex_.Lock();
|
|
cfd->internal_stats()->RecordLevelNSlowdown(max_level, elapsed, true);
|
|
} else {
|
|
unique_ptr<WritableFile> lfile;
|
|
log::Writer* new_log = nullptr;
|
|
MemTable* new_mem = nullptr;
|
|
|
|
// Attempt to switch to a new memtable and trigger flush of old.
|
|
// Do this without holding the dbmutex lock.
|
|
assert(versions_->PrevLogNumber() == 0);
|
|
bool creating_new_log = !log_empty_;
|
|
uint64_t new_log_number =
|
|
creating_new_log ? versions_->NewFileNumber() : logfile_number_;
|
|
SuperVersion* new_superversion = nullptr;
|
|
mutex_.Unlock();
|
|
{
|
|
DelayLoggingAndReset();
|
|
if (creating_new_log) {
|
|
s = env_->NewWritableFile(
|
|
LogFileName(options_.wal_dir, new_log_number), &lfile,
|
|
env_->OptimizeForLogWrite(storage_options_));
|
|
if (s.ok()) {
|
|
// Our final size should be less than write_buffer_size
|
|
// (compression, etc) but err on the side of caution.
|
|
lfile->SetPreallocationBlockSize(1.1 *
|
|
cfd->options()->write_buffer_size);
|
|
new_log = new log::Writer(std::move(lfile));
|
|
}
|
|
}
|
|
|
|
if (s.ok()) {
|
|
new_mem = new MemTable(cfd->internal_comparator(), *cfd->options());
|
|
new_superversion = new SuperVersion();
|
|
}
|
|
}
|
|
mutex_.Lock();
|
|
if (!s.ok()) {
|
|
// how do we fail if we're not creating new log?
|
|
assert(creating_new_log);
|
|
// Avoid chewing through file number space in a tight loop.
|
|
versions_->ReuseLogFileNumber(new_log_number);
|
|
assert(!new_mem);
|
|
assert(!new_log);
|
|
break;
|
|
}
|
|
if (creating_new_log) {
|
|
logfile_number_ = new_log_number;
|
|
assert(new_log != nullptr);
|
|
logs_to_free->push_back(log_.release());
|
|
log_.reset(new_log);
|
|
log_empty_ = true;
|
|
alive_log_files_.push_back(LogFileNumberSize(logfile_number_));
|
|
for (auto cfd : *versions_->GetColumnFamilySet()) {
|
|
// all this is just optimization to delete logs that
|
|
// are no longer needed -- if CF is empty, that means it
|
|
// doesn't need that particular log to stay alive, so we just
|
|
// advance the log number. no need to persist this in the manifest
|
|
if (cfd->mem()->GetFirstSequenceNumber() == 0 &&
|
|
cfd->imm()->size() == 0) {
|
|
cfd->SetLogNumber(logfile_number_);
|
|
}
|
|
}
|
|
}
|
|
cfd->mem()->SetNextLogNumber(logfile_number_);
|
|
cfd->imm()->Add(cfd->mem());
|
|
if (force) {
|
|
cfd->imm()->FlushRequested();
|
|
}
|
|
new_mem->Ref();
|
|
cfd->SetMemtable(new_mem);
|
|
Log(options_.info_log,
|
|
"[%s] New memtable created with log file: #%" PRIu64 "\n",
|
|
cfd->GetName().c_str(), logfile_number_);
|
|
force = false; // Do not force another compaction if have room
|
|
MaybeScheduleFlushOrCompaction();
|
|
superversions_to_free->push_back(
|
|
cfd->InstallSuperVersion(new_superversion, &mutex_));
|
|
}
|
|
}
|
|
return s;
|
|
}
|
|
|
|
#ifndef ROCKSDB_LITE
|
|
Status DBImpl::GetPropertiesOfAllTables(ColumnFamilyHandle* column_family,
|
|
TablePropertiesCollection* props) {
|
|
auto cfh = reinterpret_cast<ColumnFamilyHandleImpl*>(column_family);
|
|
auto cfd = cfh->cfd();
|
|
|
|
// Increment the ref count
|
|
mutex_.Lock();
|
|
auto version = cfd->current();
|
|
version->Ref();
|
|
mutex_.Unlock();
|
|
|
|
auto s = version->GetPropertiesOfAllTables(props);
|
|
|
|
// Decrement the ref count
|
|
mutex_.Lock();
|
|
version->Unref();
|
|
mutex_.Unlock();
|
|
|
|
return s;
|
|
}
|
|
#endif // ROCKSDB_LITE
|
|
|
|
const std::string& DBImpl::GetName() const {
|
|
return dbname_;
|
|
}
|
|
|
|
Env* DBImpl::GetEnv() const {
|
|
return env_;
|
|
}
|
|
|
|
const Options& DBImpl::GetOptions(ColumnFamilyHandle* column_family) const {
|
|
auto cfh = reinterpret_cast<ColumnFamilyHandleImpl*>(column_family);
|
|
return *cfh->cfd()->options();
|
|
}
|
|
|
|
bool DBImpl::GetProperty(ColumnFamilyHandle* column_family,
|
|
const Slice& property, std::string* value) {
|
|
value->clear();
|
|
auto cfh = reinterpret_cast<ColumnFamilyHandleImpl*>(column_family);
|
|
auto cfd = cfh->cfd();
|
|
DBPropertyType property_type = GetPropertyType(property);
|
|
MutexLock l(&mutex_);
|
|
return cfd->internal_stats()->GetProperty(property_type, property, value);
|
|
}
|
|
|
|
bool DBImpl::GetIntProperty(ColumnFamilyHandle* column_family,
|
|
const Slice& property, uint64_t* value) {
|
|
auto cfh = reinterpret_cast<ColumnFamilyHandleImpl*>(column_family);
|
|
auto cfd = cfh->cfd();
|
|
DBPropertyType property_type = GetPropertyType(property);
|
|
MutexLock l(&mutex_);
|
|
return cfd->internal_stats()->GetIntProperty(property_type, property, value);
|
|
}
|
|
|
|
void DBImpl::GetApproximateSizes(ColumnFamilyHandle* column_family,
|
|
const Range* range, int n, uint64_t* sizes) {
|
|
// TODO(opt): better implementation
|
|
Version* v;
|
|
auto cfh = reinterpret_cast<ColumnFamilyHandleImpl*>(column_family);
|
|
auto cfd = cfh->cfd();
|
|
{
|
|
MutexLock l(&mutex_);
|
|
v = cfd->current();
|
|
v->Ref();
|
|
}
|
|
|
|
for (int i = 0; i < n; i++) {
|
|
// Convert user_key into a corresponding internal key.
|
|
InternalKey k1(range[i].start, kMaxSequenceNumber, kValueTypeForSeek);
|
|
InternalKey k2(range[i].limit, kMaxSequenceNumber, kValueTypeForSeek);
|
|
uint64_t start = versions_->ApproximateOffsetOf(v, k1);
|
|
uint64_t limit = versions_->ApproximateOffsetOf(v, k2);
|
|
sizes[i] = (limit >= start ? limit - start : 0);
|
|
}
|
|
|
|
{
|
|
MutexLock l(&mutex_);
|
|
v->Unref();
|
|
}
|
|
}
|
|
|
|
inline void DBImpl::DelayLoggingAndReset() {
|
|
if (delayed_writes_ > 0) {
|
|
Log(options_.info_log, "delayed %d write...\n", delayed_writes_ );
|
|
delayed_writes_ = 0;
|
|
}
|
|
}
|
|
|
|
#ifndef ROCKSDB_LITE
|
|
Status DBImpl::GetUpdatesSince(
|
|
SequenceNumber seq, unique_ptr<TransactionLogIterator>* iter,
|
|
const TransactionLogIterator::ReadOptions& read_options) {
|
|
|
|
RecordTick(stats_, GET_UPDATES_SINCE_CALLS);
|
|
if (seq > versions_->LastSequence()) {
|
|
return Status::NotFound("Requested sequence not yet written in the db");
|
|
}
|
|
// Get all sorted Wal Files.
|
|
// Do binary search and open files and find the seq number.
|
|
|
|
std::unique_ptr<VectorLogPtr> wal_files(new VectorLogPtr);
|
|
Status s = GetSortedWalFiles(*wal_files);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
s = RetainProbableWalFiles(*wal_files, seq);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
iter->reset(new TransactionLogIteratorImpl(options_.wal_dir, &options_,
|
|
read_options, storage_options_,
|
|
seq, std::move(wal_files), this));
|
|
return (*iter)->status();
|
|
}
|
|
|
|
Status DBImpl::DeleteFile(std::string name) {
|
|
uint64_t number;
|
|
FileType type;
|
|
WalFileType log_type;
|
|
if (!ParseFileName(name, &number, &type, &log_type) ||
|
|
(type != kTableFile && type != kLogFile)) {
|
|
Log(options_.info_log, "DeleteFile %s failed.\n", name.c_str());
|
|
return Status::InvalidArgument("Invalid file name");
|
|
}
|
|
|
|
Status status;
|
|
if (type == kLogFile) {
|
|
// Only allow deleting archived log files
|
|
if (log_type != kArchivedLogFile) {
|
|
Log(options_.info_log, "DeleteFile %s failed - not archived log.\n",
|
|
name.c_str());
|
|
return Status::NotSupported("Delete only supported for archived logs");
|
|
}
|
|
status = env_->DeleteFile(options_.wal_dir + "/" + name.c_str());
|
|
if (!status.ok()) {
|
|
Log(options_.info_log, "DeleteFile %s failed -- %s.\n",
|
|
name.c_str(), status.ToString().c_str());
|
|
}
|
|
return status;
|
|
}
|
|
|
|
int level;
|
|
FileMetaData* metadata;
|
|
ColumnFamilyData* cfd;
|
|
VersionEdit edit;
|
|
DeletionState deletion_state(true);
|
|
{
|
|
MutexLock l(&mutex_);
|
|
status = versions_->GetMetadataForFile(number, &level, &metadata, &cfd);
|
|
if (!status.ok()) {
|
|
Log(options_.info_log, "DeleteFile %s failed. File not found\n",
|
|
name.c_str());
|
|
return Status::InvalidArgument("File not found");
|
|
}
|
|
assert((level > 0) && (level < cfd->NumberLevels()));
|
|
|
|
// If the file is being compacted no need to delete.
|
|
if (metadata->being_compacted) {
|
|
Log(options_.info_log,
|
|
"DeleteFile %s Skipped. File about to be compacted\n", name.c_str());
|
|
return Status::OK();
|
|
}
|
|
|
|
// Only the files in the last level can be deleted externally.
|
|
// This is to make sure that any deletion tombstones are not
|
|
// lost. Check that the level passed is the last level.
|
|
for (int i = level + 1; i < cfd->NumberLevels(); i++) {
|
|
if (cfd->current()->NumLevelFiles(i) != 0) {
|
|
Log(options_.info_log,
|
|
"DeleteFile %s FAILED. File not in last level\n", name.c_str());
|
|
return Status::InvalidArgument("File not in last level");
|
|
}
|
|
}
|
|
edit.DeleteFile(level, number);
|
|
status = versions_->LogAndApply(cfd, &edit, &mutex_, db_directory_.get());
|
|
if (status.ok()) {
|
|
InstallSuperVersion(cfd, deletion_state);
|
|
}
|
|
FindObsoleteFiles(deletion_state, false);
|
|
} // lock released here
|
|
LogFlush(options_.info_log);
|
|
// remove files outside the db-lock
|
|
if (deletion_state.HaveSomethingToDelete()) {
|
|
PurgeObsoleteFiles(deletion_state);
|
|
}
|
|
{
|
|
MutexLock l(&mutex_);
|
|
// schedule flush if file deletion means we freed the space for flushes to
|
|
// continue
|
|
MaybeScheduleFlushOrCompaction();
|
|
}
|
|
return status;
|
|
}
|
|
|
|
void DBImpl::GetLiveFilesMetaData(std::vector<LiveFileMetaData>* metadata) {
|
|
MutexLock l(&mutex_);
|
|
versions_->GetLiveFilesMetaData(metadata);
|
|
}
|
|
#endif // ROCKSDB_LITE
|
|
|
|
Status DBImpl::CheckConsistency() {
|
|
mutex_.AssertHeld();
|
|
std::vector<LiveFileMetaData> metadata;
|
|
versions_->GetLiveFilesMetaData(&metadata);
|
|
|
|
std::string corruption_messages;
|
|
for (const auto& md : metadata) {
|
|
std::string file_path = md.db_path + "/" + md.name;
|
|
|
|
uint64_t fsize = 0;
|
|
Status s = env_->GetFileSize(file_path, &fsize);
|
|
if (!s.ok()) {
|
|
corruption_messages +=
|
|
"Can't access " + md.name + ": " + s.ToString() + "\n";
|
|
} else if (fsize != md.size) {
|
|
corruption_messages += "Sst file size mismatch: " + file_path +
|
|
". Size recorded in manifest " +
|
|
std::to_string(md.size) + ", actual size " +
|
|
std::to_string(fsize) + "\n";
|
|
}
|
|
}
|
|
if (corruption_messages.size() == 0) {
|
|
return Status::OK();
|
|
} else {
|
|
return Status::Corruption(corruption_messages);
|
|
}
|
|
}
|
|
|
|
Status DBImpl::GetDbIdentity(std::string& identity) {
|
|
std::string idfilename = IdentityFileName(dbname_);
|
|
unique_ptr<SequentialFile> idfile;
|
|
const EnvOptions soptions;
|
|
Status s = env_->NewSequentialFile(idfilename, &idfile, soptions);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
uint64_t file_size;
|
|
s = env_->GetFileSize(idfilename, &file_size);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
char buffer[file_size];
|
|
Slice id;
|
|
s = idfile->Read(file_size, &id, buffer);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
identity.assign(id.ToString());
|
|
// If last character is '\n' remove it from identity
|
|
if (identity.size() > 0 && identity.back() == '\n') {
|
|
identity.pop_back();
|
|
}
|
|
return s;
|
|
}
|
|
|
|
// Default implementations of convenience methods that subclasses of DB
|
|
// can call if they wish
|
|
Status DB::Put(const WriteOptions& opt, ColumnFamilyHandle* column_family,
|
|
const Slice& key, const Slice& value) {
|
|
// Pre-allocate size of write batch conservatively.
|
|
// 8 bytes are taken by header, 4 bytes for count, 1 byte for type,
|
|
// and we allocate 11 extra bytes for key length, as well as value length.
|
|
WriteBatch batch(key.size() + value.size() + 24);
|
|
batch.Put(column_family, key, value);
|
|
return Write(opt, &batch);
|
|
}
|
|
|
|
Status DB::Delete(const WriteOptions& opt, ColumnFamilyHandle* column_family,
|
|
const Slice& key) {
|
|
WriteBatch batch;
|
|
batch.Delete(column_family, key);
|
|
return Write(opt, &batch);
|
|
}
|
|
|
|
Status DB::Merge(const WriteOptions& opt, ColumnFamilyHandle* column_family,
|
|
const Slice& key, const Slice& value) {
|
|
WriteBatch batch;
|
|
batch.Merge(column_family, key, value);
|
|
return Write(opt, &batch);
|
|
}
|
|
|
|
// Default implementation -- returns not supported status
|
|
Status DB::CreateColumnFamily(const ColumnFamilyOptions& options,
|
|
const std::string& column_family_name,
|
|
ColumnFamilyHandle** handle) {
|
|
return Status::NotSupported("");
|
|
}
|
|
Status DB::DropColumnFamily(ColumnFamilyHandle* column_family) {
|
|
return Status::NotSupported("");
|
|
}
|
|
|
|
DB::~DB() { }
|
|
|
|
Status DB::Open(const Options& options, const std::string& dbname, DB** dbptr) {
|
|
DBOptions db_options(options);
|
|
ColumnFamilyOptions cf_options(options);
|
|
std::vector<ColumnFamilyDescriptor> column_families;
|
|
column_families.push_back(
|
|
ColumnFamilyDescriptor(kDefaultColumnFamilyName, cf_options));
|
|
std::vector<ColumnFamilyHandle*> handles;
|
|
Status s = DB::Open(db_options, dbname, column_families, &handles, dbptr);
|
|
if (s.ok()) {
|
|
assert(handles.size() == 1);
|
|
// i can delete the handle since DBImpl is always holding a reference to
|
|
// default column family
|
|
delete handles[0];
|
|
}
|
|
return s;
|
|
}
|
|
|
|
Status DB::Open(const DBOptions& db_options, const std::string& dbname,
|
|
const std::vector<ColumnFamilyDescriptor>& column_families,
|
|
std::vector<ColumnFamilyHandle*>* handles, DB** dbptr) {
|
|
if (db_options.db_paths.size() > 1) {
|
|
for (auto& cfd : column_families) {
|
|
if (cfd.options.compaction_style != kCompactionStyleUniversal) {
|
|
return Status::NotSupported(
|
|
"More than one DB paths are only supported in "
|
|
"universal compaction style. ");
|
|
}
|
|
}
|
|
|
|
if (db_options.db_paths.size() > 4) {
|
|
return Status::NotSupported(
|
|
"More than four DB paths are not supported yet. ");
|
|
}
|
|
}
|
|
|
|
*dbptr = nullptr;
|
|
handles->clear();
|
|
|
|
size_t max_write_buffer_size = 0;
|
|
for (auto cf : column_families) {
|
|
max_write_buffer_size =
|
|
std::max(max_write_buffer_size, cf.options.write_buffer_size);
|
|
if (cf.options.block_cache != nullptr && cf.options.no_block_cache) {
|
|
return Status::InvalidArgument(
|
|
"no_block_cache is true while block_cache is not nullptr");
|
|
}
|
|
}
|
|
|
|
DBImpl* impl = new DBImpl(db_options, dbname);
|
|
Status s = impl->env_->CreateDirIfMissing(impl->options_.wal_dir);
|
|
if (s.ok()) {
|
|
for (auto db_path : impl->options_.db_paths) {
|
|
s = impl->env_->CreateDirIfMissing(db_path.path);
|
|
if (!s.ok()) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!s.ok()) {
|
|
delete impl;
|
|
return s;
|
|
}
|
|
|
|
s = impl->CreateArchivalDirectory();
|
|
if (!s.ok()) {
|
|
delete impl;
|
|
return s;
|
|
}
|
|
impl->mutex_.Lock();
|
|
// Handles create_if_missing, error_if_exists
|
|
s = impl->Recover(column_families);
|
|
if (s.ok()) {
|
|
uint64_t new_log_number = impl->versions_->NewFileNumber();
|
|
unique_ptr<WritableFile> lfile;
|
|
EnvOptions soptions(db_options);
|
|
s = impl->options_.env->NewWritableFile(
|
|
LogFileName(impl->options_.wal_dir, new_log_number), &lfile,
|
|
impl->options_.env->OptimizeForLogWrite(soptions));
|
|
if (s.ok()) {
|
|
lfile->SetPreallocationBlockSize(1.1 * max_write_buffer_size);
|
|
impl->logfile_number_ = new_log_number;
|
|
impl->log_.reset(new log::Writer(std::move(lfile)));
|
|
|
|
// set column family handles
|
|
for (auto cf : column_families) {
|
|
auto cfd =
|
|
impl->versions_->GetColumnFamilySet()->GetColumnFamily(cf.name);
|
|
if (cfd != nullptr) {
|
|
handles->push_back(
|
|
new ColumnFamilyHandleImpl(cfd, impl, &impl->mutex_));
|
|
} else {
|
|
if (db_options.create_missing_column_families) {
|
|
// missing column family, create it
|
|
ColumnFamilyHandle* handle;
|
|
impl->mutex_.Unlock();
|
|
s = impl->CreateColumnFamily(cf.options, cf.name, &handle);
|
|
impl->mutex_.Lock();
|
|
if (s.ok()) {
|
|
handles->push_back(handle);
|
|
} else {
|
|
break;
|
|
}
|
|
} else {
|
|
s = Status::InvalidArgument("Column family not found: ", cf.name);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (s.ok()) {
|
|
for (auto cfd : *impl->versions_->GetColumnFamilySet()) {
|
|
delete cfd->InstallSuperVersion(new SuperVersion(), &impl->mutex_);
|
|
}
|
|
impl->alive_log_files_.push_back(
|
|
DBImpl::LogFileNumberSize(impl->logfile_number_));
|
|
impl->DeleteObsoleteFiles();
|
|
impl->MaybeScheduleFlushOrCompaction();
|
|
s = impl->db_directory_->Fsync();
|
|
}
|
|
}
|
|
|
|
if (s.ok()) {
|
|
for (auto cfd : *impl->versions_->GetColumnFamilySet()) {
|
|
if (cfd->options()->compaction_style == kCompactionStyleUniversal ||
|
|
cfd->options()->compaction_style == kCompactionStyleFIFO) {
|
|
Version* current = cfd->current();
|
|
for (int i = 1; i < current->NumberLevels(); ++i) {
|
|
int num_files = current->NumLevelFiles(i);
|
|
if (num_files > 0) {
|
|
s = Status::InvalidArgument(
|
|
"Not all files are at level 0. Cannot "
|
|
"open with universal or FIFO compaction style.");
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (cfd->options()->merge_operator != nullptr &&
|
|
!cfd->mem()->IsMergeOperatorSupported()) {
|
|
s = Status::InvalidArgument(
|
|
"The memtable of column family %s does not support merge operator "
|
|
"its options.merge_operator is non-null", cfd->GetName().c_str());
|
|
}
|
|
if (!s.ok()) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
impl->mutex_.Unlock();
|
|
|
|
if (s.ok()) {
|
|
impl->opened_successfully_ = true;
|
|
*dbptr = impl;
|
|
} else {
|
|
for (auto h : *handles) {
|
|
delete h;
|
|
}
|
|
handles->clear();
|
|
delete impl;
|
|
}
|
|
return s;
|
|
}
|
|
|
|
Status DB::ListColumnFamilies(const DBOptions& db_options,
|
|
const std::string& name,
|
|
std::vector<std::string>* column_families) {
|
|
return VersionSet::ListColumnFamilies(column_families, name, db_options.env);
|
|
}
|
|
|
|
Snapshot::~Snapshot() {
|
|
}
|
|
|
|
Status DestroyDB(const std::string& dbname, const Options& options) {
|
|
const InternalKeyComparator comparator(options.comparator);
|
|
const InternalFilterPolicy filter_policy(options.filter_policy);
|
|
const Options& soptions(SanitizeOptions(
|
|
dbname, &comparator, &filter_policy, options));
|
|
Env* env = soptions.env;
|
|
std::vector<std::string> filenames;
|
|
std::vector<std::string> archiveFiles;
|
|
|
|
std::string archivedir = ArchivalDirectory(dbname);
|
|
// Ignore error in case directory does not exist
|
|
env->GetChildren(dbname, &filenames);
|
|
|
|
if (dbname != soptions.wal_dir) {
|
|
std::vector<std::string> logfilenames;
|
|
env->GetChildren(soptions.wal_dir, &logfilenames);
|
|
filenames.insert(filenames.end(), logfilenames.begin(), logfilenames.end());
|
|
archivedir = ArchivalDirectory(soptions.wal_dir);
|
|
}
|
|
|
|
if (filenames.empty()) {
|
|
return Status::OK();
|
|
}
|
|
|
|
FileLock* lock;
|
|
const std::string lockname = LockFileName(dbname);
|
|
Status result = env->LockFile(lockname, &lock);
|
|
if (result.ok()) {
|
|
uint64_t number;
|
|
FileType type;
|
|
for (size_t i = 0; i < filenames.size(); i++) {
|
|
if (ParseFileName(filenames[i], &number, &type) &&
|
|
type != kDBLockFile) { // Lock file will be deleted at end
|
|
Status del;
|
|
if (type == kMetaDatabase) {
|
|
del = DestroyDB(dbname + "/" + filenames[i], options);
|
|
} else if (type == kLogFile) {
|
|
del = env->DeleteFile(soptions.wal_dir + "/" + filenames[i]);
|
|
} else {
|
|
del = env->DeleteFile(dbname + "/" + filenames[i]);
|
|
}
|
|
if (result.ok() && !del.ok()) {
|
|
result = del;
|
|
}
|
|
}
|
|
}
|
|
|
|
for (auto& db_path : options.db_paths) {
|
|
env->GetChildren(db_path.path, &filenames);
|
|
uint64_t number;
|
|
FileType type;
|
|
for (size_t i = 0; i < filenames.size(); i++) {
|
|
if (ParseFileName(filenames[i], &number, &type) &&
|
|
type == kTableFile) { // Lock file will be deleted at end
|
|
Status del = env->DeleteFile(db_path.path + "/" + filenames[i]);
|
|
if (result.ok() && !del.ok()) {
|
|
result = del;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
env->GetChildren(archivedir, &archiveFiles);
|
|
// Delete archival files.
|
|
for (size_t i = 0; i < archiveFiles.size(); ++i) {
|
|
if (ParseFileName(archiveFiles[i], &number, &type) &&
|
|
type == kLogFile) {
|
|
Status del = env->DeleteFile(archivedir + "/" + archiveFiles[i]);
|
|
if (result.ok() && !del.ok()) {
|
|
result = del;
|
|
}
|
|
}
|
|
}
|
|
// ignore case where no archival directory is present.
|
|
env->DeleteDir(archivedir);
|
|
|
|
env->UnlockFile(lock); // Ignore error since state is already gone
|
|
env->DeleteFile(lockname);
|
|
env->DeleteDir(dbname); // Ignore error in case dir contains other files
|
|
env->DeleteDir(soptions.wal_dir);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
//
|
|
// A global method that can dump out the build version
|
|
void DumpLeveldbBuildVersion(Logger * log) {
|
|
#if !defined(IOS_CROSS_COMPILE)
|
|
// if we compile with Xcode, we don't run build_detect_vesion, so we don't generate util/build_version.cc
|
|
Log(log, "Git sha %s", rocksdb_build_git_sha);
|
|
Log(log, "Compile time %s %s",
|
|
rocksdb_build_compile_time, rocksdb_build_compile_date);
|
|
#endif
|
|
}
|
|
|
|
} // namespace rocksdb
|