4fc442029a
Summary: if an operation just involves a single column family, then we do not have to set the kInAtomicGroup tag when writing to MANIFEST. This change can fix a compatibility test failure, i.e. 5.15 and earlier cannot recognize kInAtomicGroup tag. Pull Request resolved: https://github.com/facebook/rocksdb/pull/4981 Differential Revision: D14072687 Pulled By: riversand963 fbshipit-source-id: 46b0c61e399f16c6b7169de0b33430d0ed90d6d4
636 lines
22 KiB
C++
636 lines
22 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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#include "db/memtable_list.h"
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#ifndef __STDC_FORMAT_MACROS
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#define __STDC_FORMAT_MACROS
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#endif
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#include <inttypes.h>
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#include <limits>
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#include <queue>
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#include <string>
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#include "db/db_impl.h"
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#include "db/memtable.h"
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#include "db/range_tombstone_fragmenter.h"
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#include "db/version_set.h"
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#include "monitoring/thread_status_util.h"
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#include "rocksdb/db.h"
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#include "rocksdb/env.h"
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#include "rocksdb/iterator.h"
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#include "table/merging_iterator.h"
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#include "util/coding.h"
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#include "util/log_buffer.h"
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#include "util/sync_point.h"
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namespace rocksdb {
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class InternalKeyComparator;
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class Mutex;
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class VersionSet;
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void MemTableListVersion::AddMemTable(MemTable* m) {
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memlist_.push_front(m);
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*parent_memtable_list_memory_usage_ += m->ApproximateMemoryUsage();
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}
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void MemTableListVersion::UnrefMemTable(autovector<MemTable*>* to_delete,
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MemTable* m) {
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if (m->Unref()) {
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to_delete->push_back(m);
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assert(*parent_memtable_list_memory_usage_ >= m->ApproximateMemoryUsage());
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*parent_memtable_list_memory_usage_ -= m->ApproximateMemoryUsage();
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}
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}
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MemTableListVersion::MemTableListVersion(
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size_t* parent_memtable_list_memory_usage, MemTableListVersion* old)
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: max_write_buffer_number_to_maintain_(
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old->max_write_buffer_number_to_maintain_),
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parent_memtable_list_memory_usage_(parent_memtable_list_memory_usage) {
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if (old != nullptr) {
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memlist_ = old->memlist_;
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for (auto& m : memlist_) {
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m->Ref();
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}
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memlist_history_ = old->memlist_history_;
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for (auto& m : memlist_history_) {
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m->Ref();
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}
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}
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}
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MemTableListVersion::MemTableListVersion(
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size_t* parent_memtable_list_memory_usage,
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int max_write_buffer_number_to_maintain)
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: max_write_buffer_number_to_maintain_(max_write_buffer_number_to_maintain),
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parent_memtable_list_memory_usage_(parent_memtable_list_memory_usage) {}
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void MemTableListVersion::Ref() { ++refs_; }
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// called by superversion::clean()
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void MemTableListVersion::Unref(autovector<MemTable*>* to_delete) {
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assert(refs_ >= 1);
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--refs_;
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if (refs_ == 0) {
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// if to_delete is equal to nullptr it means we're confident
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// that refs_ will not be zero
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assert(to_delete != nullptr);
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for (const auto& m : memlist_) {
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UnrefMemTable(to_delete, m);
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}
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for (const auto& m : memlist_history_) {
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UnrefMemTable(to_delete, m);
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}
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delete this;
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}
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}
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int MemTableList::NumNotFlushed() const {
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int size = static_cast<int>(current_->memlist_.size());
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assert(num_flush_not_started_ <= size);
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return size;
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}
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int MemTableList::NumFlushed() const {
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return static_cast<int>(current_->memlist_history_.size());
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}
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// Search all the memtables starting from the most recent one.
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// Return the most recent value found, if any.
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// Operands stores the list of merge operations to apply, so far.
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bool MemTableListVersion::Get(const LookupKey& key, std::string* value,
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Status* s, MergeContext* merge_context,
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SequenceNumber* max_covering_tombstone_seq,
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SequenceNumber* seq, const ReadOptions& read_opts,
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ReadCallback* callback, bool* is_blob_index) {
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return GetFromList(&memlist_, key, value, s, merge_context,
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max_covering_tombstone_seq, seq, read_opts, callback,
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is_blob_index);
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}
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bool MemTableListVersion::GetFromHistory(
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const LookupKey& key, std::string* value, Status* s,
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MergeContext* merge_context, SequenceNumber* max_covering_tombstone_seq,
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SequenceNumber* seq, const ReadOptions& read_opts, bool* is_blob_index) {
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return GetFromList(&memlist_history_, key, value, s, merge_context,
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max_covering_tombstone_seq, seq, read_opts,
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nullptr /*read_callback*/, is_blob_index);
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}
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bool MemTableListVersion::GetFromList(
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std::list<MemTable*>* list, const LookupKey& key, std::string* value,
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Status* s, MergeContext* merge_context,
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SequenceNumber* max_covering_tombstone_seq, SequenceNumber* seq,
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const ReadOptions& read_opts, ReadCallback* callback, bool* is_blob_index) {
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*seq = kMaxSequenceNumber;
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for (auto& memtable : *list) {
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SequenceNumber current_seq = kMaxSequenceNumber;
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bool done =
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memtable->Get(key, value, s, merge_context, max_covering_tombstone_seq,
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¤t_seq, read_opts, callback, is_blob_index);
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if (*seq == kMaxSequenceNumber) {
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// Store the most recent sequence number of any operation on this key.
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// Since we only care about the most recent change, we only need to
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// return the first operation found when searching memtables in
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// reverse-chronological order.
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// current_seq would be equal to kMaxSequenceNumber if the value was to be
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// skipped. This allows seq to be assigned again when the next value is
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// read.
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*seq = current_seq;
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}
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if (done) {
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assert(*seq != kMaxSequenceNumber || s->IsNotFound());
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return true;
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}
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if (!done && !s->ok() && !s->IsMergeInProgress() && !s->IsNotFound()) {
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return false;
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}
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}
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return false;
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}
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Status MemTableListVersion::AddRangeTombstoneIterators(
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const ReadOptions& read_opts, Arena* /*arena*/,
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RangeDelAggregator* range_del_agg) {
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assert(range_del_agg != nullptr);
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for (auto& m : memlist_) {
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// Using kMaxSequenceNumber is OK because these are immutable memtables.
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std::unique_ptr<FragmentedRangeTombstoneIterator> range_del_iter(
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m->NewRangeTombstoneIterator(read_opts,
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kMaxSequenceNumber /* read_seq */));
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range_del_agg->AddTombstones(std::move(range_del_iter));
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}
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return Status::OK();
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}
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void MemTableListVersion::AddIterators(
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const ReadOptions& options, std::vector<InternalIterator*>* iterator_list,
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Arena* arena) {
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for (auto& m : memlist_) {
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iterator_list->push_back(m->NewIterator(options, arena));
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}
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}
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void MemTableListVersion::AddIterators(
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const ReadOptions& options, MergeIteratorBuilder* merge_iter_builder) {
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for (auto& m : memlist_) {
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merge_iter_builder->AddIterator(
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m->NewIterator(options, merge_iter_builder->GetArena()));
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}
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}
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uint64_t MemTableListVersion::GetTotalNumEntries() const {
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uint64_t total_num = 0;
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for (auto& m : memlist_) {
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total_num += m->num_entries();
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}
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return total_num;
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}
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MemTable::MemTableStats MemTableListVersion::ApproximateStats(
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const Slice& start_ikey, const Slice& end_ikey) {
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MemTable::MemTableStats total_stats = {0, 0};
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for (auto& m : memlist_) {
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auto mStats = m->ApproximateStats(start_ikey, end_ikey);
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total_stats.size += mStats.size;
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total_stats.count += mStats.count;
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}
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return total_stats;
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}
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uint64_t MemTableListVersion::GetTotalNumDeletes() const {
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uint64_t total_num = 0;
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for (auto& m : memlist_) {
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total_num += m->num_deletes();
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}
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return total_num;
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}
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SequenceNumber MemTableListVersion::GetEarliestSequenceNumber(
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bool include_history) const {
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if (include_history && !memlist_history_.empty()) {
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return memlist_history_.back()->GetEarliestSequenceNumber();
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} else if (!memlist_.empty()) {
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return memlist_.back()->GetEarliestSequenceNumber();
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} else {
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return kMaxSequenceNumber;
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}
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}
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// caller is responsible for referencing m
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void MemTableListVersion::Add(MemTable* m, autovector<MemTable*>* to_delete) {
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assert(refs_ == 1); // only when refs_ == 1 is MemTableListVersion mutable
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AddMemTable(m);
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TrimHistory(to_delete);
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}
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// Removes m from list of memtables not flushed. Caller should NOT Unref m.
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void MemTableListVersion::Remove(MemTable* m,
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autovector<MemTable*>* to_delete) {
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assert(refs_ == 1); // only when refs_ == 1 is MemTableListVersion mutable
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memlist_.remove(m);
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m->MarkFlushed();
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if (max_write_buffer_number_to_maintain_ > 0) {
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memlist_history_.push_front(m);
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TrimHistory(to_delete);
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} else {
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UnrefMemTable(to_delete, m);
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}
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}
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// Make sure we don't use up too much space in history
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void MemTableListVersion::TrimHistory(autovector<MemTable*>* to_delete) {
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while (memlist_.size() + memlist_history_.size() >
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static_cast<size_t>(max_write_buffer_number_to_maintain_) &&
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!memlist_history_.empty()) {
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MemTable* x = memlist_history_.back();
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memlist_history_.pop_back();
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UnrefMemTable(to_delete, x);
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}
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}
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// Returns true if there is at least one memtable on which flush has
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// not yet started.
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bool MemTableList::IsFlushPending() const {
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if ((flush_requested_ && num_flush_not_started_ > 0) ||
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(num_flush_not_started_ >= min_write_buffer_number_to_merge_)) {
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assert(imm_flush_needed.load(std::memory_order_relaxed));
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return true;
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}
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return false;
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}
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// Returns the memtables that need to be flushed.
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void MemTableList::PickMemtablesToFlush(const uint64_t* max_memtable_id,
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autovector<MemTable*>* ret) {
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AutoThreadOperationStageUpdater stage_updater(
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ThreadStatus::STAGE_PICK_MEMTABLES_TO_FLUSH);
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const auto& memlist = current_->memlist_;
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for (auto it = memlist.rbegin(); it != memlist.rend(); ++it) {
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MemTable* m = *it;
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if (max_memtable_id != nullptr && m->GetID() > *max_memtable_id) {
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break;
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}
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if (!m->flush_in_progress_) {
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assert(!m->flush_completed_);
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num_flush_not_started_--;
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if (num_flush_not_started_ == 0) {
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imm_flush_needed.store(false, std::memory_order_release);
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}
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m->flush_in_progress_ = true; // flushing will start very soon
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ret->push_back(m);
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}
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}
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flush_requested_ = false; // start-flush request is complete
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}
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void MemTableList::RollbackMemtableFlush(const autovector<MemTable*>& mems,
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uint64_t /*file_number*/) {
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AutoThreadOperationStageUpdater stage_updater(
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ThreadStatus::STAGE_MEMTABLE_ROLLBACK);
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assert(!mems.empty());
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// If the flush was not successful, then just reset state.
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// Maybe a succeeding attempt to flush will be successful.
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for (MemTable* m : mems) {
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assert(m->flush_in_progress_);
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assert(m->file_number_ == 0);
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m->flush_in_progress_ = false;
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m->flush_completed_ = false;
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m->edit_.Clear();
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num_flush_not_started_++;
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}
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imm_flush_needed.store(true, std::memory_order_release);
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}
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// Try record a successful flush in the manifest file. It might just return
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// Status::OK letting a concurrent flush to do actual the recording..
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Status MemTableList::TryInstallMemtableFlushResults(
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ColumnFamilyData* cfd, const MutableCFOptions& mutable_cf_options,
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const autovector<MemTable*>& mems, LogsWithPrepTracker* prep_tracker,
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VersionSet* vset, InstrumentedMutex* mu, uint64_t file_number,
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autovector<MemTable*>* to_delete, Directory* db_directory,
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LogBuffer* log_buffer) {
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AutoThreadOperationStageUpdater stage_updater(
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ThreadStatus::STAGE_MEMTABLE_INSTALL_FLUSH_RESULTS);
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mu->AssertHeld();
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// Flush was successful
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// Record the status on the memtable object. Either this call or a call by a
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// concurrent flush thread will read the status and write it to manifest.
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for (size_t i = 0; i < mems.size(); ++i) {
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// All the edits are associated with the first memtable of this batch.
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assert(i == 0 || mems[i]->GetEdits()->NumEntries() == 0);
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mems[i]->flush_completed_ = true;
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mems[i]->file_number_ = file_number;
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}
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// if some other thread is already committing, then return
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Status s;
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if (commit_in_progress_) {
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TEST_SYNC_POINT("MemTableList::TryInstallMemtableFlushResults:InProgress");
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return s;
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}
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// Only a single thread can be executing this piece of code
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commit_in_progress_ = true;
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// Retry until all completed flushes are committed. New flushes can finish
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// while the current thread is writing manifest where mutex is released.
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while (s.ok()) {
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auto& memlist = current_->memlist_;
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// The back is the oldest; if flush_completed_ is not set to it, it means
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// that we were assigned a more recent memtable. The memtables' flushes must
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// be recorded in manifest in order. A concurrent flush thread, who is
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// assigned to flush the oldest memtable, will later wake up and does all
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// the pending writes to manifest, in order.
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if (memlist.empty() || !memlist.back()->flush_completed_) {
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break;
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}
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// scan all memtables from the earliest, and commit those
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// (in that order) that have finished flushing. Memtables
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// are always committed in the order that they were created.
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uint64_t batch_file_number = 0;
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size_t batch_count = 0;
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autovector<VersionEdit*> edit_list;
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autovector<MemTable*> memtables_to_flush;
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// enumerate from the last (earliest) element to see how many batch finished
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for (auto it = memlist.rbegin(); it != memlist.rend(); ++it) {
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MemTable* m = *it;
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if (!m->flush_completed_) {
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break;
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}
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if (it == memlist.rbegin() || batch_file_number != m->file_number_) {
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batch_file_number = m->file_number_;
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ROCKS_LOG_BUFFER(log_buffer,
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"[%s] Level-0 commit table #%" PRIu64 " started",
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cfd->GetName().c_str(), m->file_number_);
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edit_list.push_back(&m->edit_);
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memtables_to_flush.push_back(m);
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}
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batch_count++;
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}
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// TODO(myabandeh): Not sure how batch_count could be 0 here.
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if (batch_count > 0) {
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if (vset->db_options()->allow_2pc) {
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assert(edit_list.size() > 0);
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// We piggyback the information of earliest log file to keep in the
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// manifest entry for the last file flushed.
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edit_list.back()->SetMinLogNumberToKeep(PrecomputeMinLogNumberToKeep(
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vset, *cfd, edit_list, memtables_to_flush, prep_tracker));
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}
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// this can release and reacquire the mutex.
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s = vset->LogAndApply(cfd, mutable_cf_options, edit_list, mu,
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db_directory);
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// we will be changing the version in the next code path,
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// so we better create a new one, since versions are immutable
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InstallNewVersion();
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// All the later memtables that have the same filenum
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// are part of the same batch. They can be committed now.
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uint64_t mem_id = 1; // how many memtables have been flushed.
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// commit new state only if the column family is NOT dropped.
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// The reason is as follows (refer to
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// ColumnFamilyTest.FlushAndDropRaceCondition).
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// If the column family is dropped, then according to LogAndApply, its
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// corresponding flush operation is NOT written to the MANIFEST. This
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// means the DB is not aware of the L0 files generated from the flush.
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// By committing the new state, we remove the memtable from the memtable
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// list. Creating an iterator on this column family will not be able to
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// read full data since the memtable is removed, and the DB is not aware
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// of the L0 files, causing MergingIterator unable to build child
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// iterators. RocksDB contract requires that the iterator can be created
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// on a dropped column family, and we must be able to
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// read full data as long as column family handle is not deleted, even if
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// the column family is dropped.
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if (s.ok() && !cfd->IsDropped()) { // commit new state
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while (batch_count-- > 0) {
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MemTable* m = current_->memlist_.back();
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ROCKS_LOG_BUFFER(log_buffer, "[%s] Level-0 commit table #%" PRIu64
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": memtable #%" PRIu64 " done",
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cfd->GetName().c_str(), m->file_number_, mem_id);
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assert(m->file_number_ > 0);
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current_->Remove(m, to_delete);
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++mem_id;
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}
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} else {
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for (auto it = current_->memlist_.rbegin(); batch_count-- > 0; it++) {
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MemTable* m = *it;
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// commit failed. setup state so that we can flush again.
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ROCKS_LOG_BUFFER(log_buffer, "Level-0 commit table #%" PRIu64
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": memtable #%" PRIu64 " failed",
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m->file_number_, mem_id);
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m->flush_completed_ = false;
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m->flush_in_progress_ = false;
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m->edit_.Clear();
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num_flush_not_started_++;
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m->file_number_ = 0;
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imm_flush_needed.store(true, std::memory_order_release);
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++mem_id;
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}
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}
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}
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}
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commit_in_progress_ = false;
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return s;
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}
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// New memtables are inserted at the front of the list.
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void MemTableList::Add(MemTable* m, autovector<MemTable*>* to_delete) {
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assert(static_cast<int>(current_->memlist_.size()) >= num_flush_not_started_);
|
|
InstallNewVersion();
|
|
// this method is used to move mutable memtable into an immutable list.
|
|
// since mutable memtable is already refcounted by the DBImpl,
|
|
// and when moving to the imutable list we don't unref it,
|
|
// we don't have to ref the memtable here. we just take over the
|
|
// reference from the DBImpl.
|
|
current_->Add(m, to_delete);
|
|
m->MarkImmutable();
|
|
num_flush_not_started_++;
|
|
if (num_flush_not_started_ == 1) {
|
|
imm_flush_needed.store(true, std::memory_order_release);
|
|
}
|
|
}
|
|
|
|
// Returns an estimate of the number of bytes of data in use.
|
|
size_t MemTableList::ApproximateUnflushedMemTablesMemoryUsage() {
|
|
size_t total_size = 0;
|
|
for (auto& memtable : current_->memlist_) {
|
|
total_size += memtable->ApproximateMemoryUsage();
|
|
}
|
|
return total_size;
|
|
}
|
|
|
|
size_t MemTableList::ApproximateMemoryUsage() { return current_memory_usage_; }
|
|
|
|
uint64_t MemTableList::ApproximateOldestKeyTime() const {
|
|
if (!current_->memlist_.empty()) {
|
|
return current_->memlist_.back()->ApproximateOldestKeyTime();
|
|
}
|
|
return std::numeric_limits<uint64_t>::max();
|
|
}
|
|
|
|
void MemTableList::InstallNewVersion() {
|
|
if (current_->refs_ == 1) {
|
|
// we're the only one using the version, just keep using it
|
|
} else {
|
|
// somebody else holds the current version, we need to create new one
|
|
MemTableListVersion* version = current_;
|
|
current_ = new MemTableListVersion(¤t_memory_usage_, current_);
|
|
current_->Ref();
|
|
version->Unref();
|
|
}
|
|
}
|
|
|
|
uint64_t MemTableList::PrecomputeMinLogContainingPrepSection(
|
|
const autovector<MemTable*>& memtables_to_flush) {
|
|
uint64_t min_log = 0;
|
|
|
|
for (auto& m : current_->memlist_) {
|
|
// Assume the list is very short, we can live with O(m*n). We can optimize
|
|
// if the performance has some problem.
|
|
bool should_skip = false;
|
|
for (MemTable* m_to_flush : memtables_to_flush) {
|
|
if (m == m_to_flush) {
|
|
should_skip = true;
|
|
break;
|
|
}
|
|
}
|
|
if (should_skip) {
|
|
continue;
|
|
}
|
|
|
|
auto log = m->GetMinLogContainingPrepSection();
|
|
|
|
if (log > 0 && (min_log == 0 || log < min_log)) {
|
|
min_log = log;
|
|
}
|
|
}
|
|
|
|
return min_log;
|
|
}
|
|
|
|
// Commit a successful atomic flush in the manifest file.
|
|
Status InstallMemtableAtomicFlushResults(
|
|
const autovector<MemTableList*>* imm_lists,
|
|
const autovector<ColumnFamilyData*>& cfds,
|
|
const autovector<const MutableCFOptions*>& mutable_cf_options_list,
|
|
const autovector<const autovector<MemTable*>*>& mems_list, VersionSet* vset,
|
|
InstrumentedMutex* mu, const autovector<FileMetaData*>& file_metas,
|
|
autovector<MemTable*>* to_delete, Directory* db_directory,
|
|
LogBuffer* log_buffer) {
|
|
AutoThreadOperationStageUpdater stage_updater(
|
|
ThreadStatus::STAGE_MEMTABLE_INSTALL_FLUSH_RESULTS);
|
|
mu->AssertHeld();
|
|
|
|
size_t num = mems_list.size();
|
|
assert(cfds.size() == num);
|
|
if (imm_lists != nullptr) {
|
|
assert(imm_lists->size() == num);
|
|
}
|
|
for (size_t k = 0; k != num; ++k) {
|
|
#ifndef NDEBUG
|
|
const auto* imm =
|
|
(imm_lists == nullptr) ? cfds[k]->imm() : imm_lists->at(k);
|
|
if (!mems_list[k]->empty()) {
|
|
assert((*mems_list[k])[0]->GetID() == imm->GetEarliestMemTableID());
|
|
}
|
|
#endif
|
|
assert(nullptr != file_metas[k]);
|
|
for (size_t i = 0; i != mems_list[k]->size(); ++i) {
|
|
assert(i == 0 || (*mems_list[k])[i]->GetEdits()->NumEntries() == 0);
|
|
(*mems_list[k])[i]->SetFlushCompleted(true);
|
|
(*mems_list[k])[i]->SetFileNumber(file_metas[k]->fd.GetNumber());
|
|
}
|
|
}
|
|
|
|
Status s;
|
|
|
|
autovector<autovector<VersionEdit*>> edit_lists;
|
|
uint32_t num_entries = 0;
|
|
for (const auto mems : mems_list) {
|
|
assert(mems != nullptr);
|
|
autovector<VersionEdit*> edits;
|
|
assert(!mems->empty());
|
|
edits.emplace_back((*mems)[0]->GetEdits());
|
|
++num_entries;
|
|
edit_lists.emplace_back(edits);
|
|
}
|
|
// Mark the version edits as an atomic group if the number of version edits
|
|
// exceeds 1.
|
|
if (cfds.size() > 1) {
|
|
for (auto& edits : edit_lists) {
|
|
assert(edits.size() == 1);
|
|
edits[0]->MarkAtomicGroup(--num_entries);
|
|
}
|
|
assert(0 == num_entries);
|
|
}
|
|
|
|
// this can release and reacquire the mutex.
|
|
s = vset->LogAndApply(cfds, mutable_cf_options_list, edit_lists, mu,
|
|
db_directory);
|
|
|
|
for (size_t k = 0; k != cfds.size(); ++k) {
|
|
auto* imm = (imm_lists == nullptr) ? cfds[k]->imm() : imm_lists->at(k);
|
|
imm->InstallNewVersion();
|
|
}
|
|
|
|
if (s.ok() || s.IsShutdownInProgress()) {
|
|
for (size_t i = 0; i != cfds.size(); ++i) {
|
|
if (cfds[i]->IsDropped()) {
|
|
continue;
|
|
}
|
|
auto* imm = (imm_lists == nullptr) ? cfds[i]->imm() : imm_lists->at(i);
|
|
for (auto m : *mems_list[i]) {
|
|
assert(m->GetFileNumber() > 0);
|
|
uint64_t mem_id = m->GetID();
|
|
ROCKS_LOG_BUFFER(log_buffer,
|
|
"[%s] Level-0 commit table #%" PRIu64
|
|
": memtable #%" PRIu64 " done",
|
|
cfds[i]->GetName().c_str(), m->GetFileNumber(),
|
|
mem_id);
|
|
imm->current_->Remove(m, to_delete);
|
|
}
|
|
}
|
|
} else {
|
|
for (size_t i = 0; i != cfds.size(); ++i) {
|
|
auto* imm = (imm_lists == nullptr) ? cfds[i]->imm() : imm_lists->at(i);
|
|
for (auto m : *mems_list[i]) {
|
|
uint64_t mem_id = m->GetID();
|
|
ROCKS_LOG_BUFFER(log_buffer,
|
|
"[%s] Level-0 commit table #%" PRIu64
|
|
": memtable #%" PRIu64 " failed",
|
|
cfds[i]->GetName().c_str(), m->GetFileNumber(),
|
|
mem_id);
|
|
m->SetFlushCompleted(false);
|
|
m->SetFlushInProgress(false);
|
|
m->GetEdits()->Clear();
|
|
m->SetFileNumber(0);
|
|
imm->num_flush_not_started_++;
|
|
}
|
|
imm->imm_flush_needed.store(true, std::memory_order_release);
|
|
}
|
|
}
|
|
|
|
return s;
|
|
}
|
|
|
|
} // namespace rocksdb
|