35ad531be3
Summary: Separate a new class InternalIterator from class Iterator, when the look-up is done internally, which also means they operate on key with sequence ID and type. This change will enable potential future optimizations but for now InternalIterator's functions are still the same as Iterator's. At the same time, separate the cleanup function to a separate class and let both of InternalIterator and Iterator inherit from it. Test Plan: Run all existing tests. Reviewers: igor, yhchiang, anthony, kradhakrishnan, IslamAbdelRahman, rven Reviewed By: rven Subscribers: leveldb, dhruba Differential Revision: https://reviews.facebook.net/D48549
3384 lines
118 KiB
C++
3384 lines
118 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/version_set.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 <stdio.h>
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#include <algorithm>
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#include <map>
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#include <set>
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#include <climits>
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#include <unordered_map>
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#include <vector>
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#include <string>
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#include "db/filename.h"
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#include "db/internal_stats.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/merge_context.h"
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#include "db/table_cache.h"
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#include "db/compaction.h"
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#include "db/version_builder.h"
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#include "db/writebuffer.h"
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#include "rocksdb/env.h"
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#include "rocksdb/merge_operator.h"
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#include "table/internal_iterator.h"
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#include "table/table_reader.h"
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#include "table/merger.h"
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#include "table/two_level_iterator.h"
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#include "table/format.h"
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#include "table/plain_table_factory.h"
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#include "table/meta_blocks.h"
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#include "table/get_context.h"
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#include "util/coding.h"
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#include "util/file_reader_writer.h"
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#include "util/logging.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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namespace {
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// Find File in LevelFilesBrief data structure
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// Within an index range defined by left and right
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int FindFileInRange(const InternalKeyComparator& icmp,
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const LevelFilesBrief& file_level,
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const Slice& key,
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uint32_t left,
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uint32_t right) {
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while (left < right) {
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uint32_t mid = (left + right) / 2;
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const FdWithKeyRange& f = file_level.files[mid];
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if (icmp.InternalKeyComparator::Compare(f.largest_key, key) < 0) {
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// Key at "mid.largest" is < "target". Therefore all
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// files at or before "mid" are uninteresting.
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left = mid + 1;
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} else {
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// Key at "mid.largest" is >= "target". Therefore all files
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// after "mid" are uninteresting.
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right = mid;
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}
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}
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return right;
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}
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// Class to help choose the next file to search for the particular key.
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// Searches and returns files level by level.
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// We can search level-by-level since entries never hop across
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// levels. Therefore we are guaranteed that if we find data
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// in a smaller level, later levels are irrelevant (unless we
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// are MergeInProgress).
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class FilePicker {
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public:
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FilePicker(
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std::vector<FileMetaData*>* files,
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const Slice& user_key,
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const Slice& ikey,
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autovector<LevelFilesBrief>* file_levels,
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unsigned int num_levels,
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FileIndexer* file_indexer,
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const Comparator* user_comparator,
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const InternalKeyComparator* internal_comparator)
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: num_levels_(num_levels),
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curr_level_(-1),
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hit_file_level_(-1),
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search_left_bound_(0),
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search_right_bound_(FileIndexer::kLevelMaxIndex),
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#ifndef NDEBUG
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files_(files),
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#endif
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level_files_brief_(file_levels),
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user_key_(user_key),
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ikey_(ikey),
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file_indexer_(file_indexer),
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user_comparator_(user_comparator),
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internal_comparator_(internal_comparator) {
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// Setup member variables to search first level.
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search_ended_ = !PrepareNextLevel();
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if (!search_ended_) {
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// Prefetch Level 0 table data to avoid cache miss if possible.
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for (unsigned int i = 0; i < (*level_files_brief_)[0].num_files; ++i) {
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auto* r = (*level_files_brief_)[0].files[i].fd.table_reader;
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if (r) {
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r->Prepare(ikey);
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}
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}
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}
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}
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FdWithKeyRange* GetNextFile() {
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while (!search_ended_) { // Loops over different levels.
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while (curr_index_in_curr_level_ < curr_file_level_->num_files) {
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// Loops over all files in current level.
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FdWithKeyRange* f = &curr_file_level_->files[curr_index_in_curr_level_];
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hit_file_level_ = curr_level_;
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int cmp_largest = -1;
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// Do key range filtering of files or/and fractional cascading if:
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// (1) not all the files are in level 0, or
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// (2) there are more than 3 Level 0 files
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// If there are only 3 or less level 0 files in the system, we skip
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// the key range filtering. In this case, more likely, the system is
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// highly tuned to minimize number of tables queried by each query,
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// so it is unlikely that key range filtering is more efficient than
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// querying the files.
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if (num_levels_ > 1 || curr_file_level_->num_files > 3) {
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// Check if key is within a file's range. If search left bound and
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// right bound point to the same find, we are sure key falls in
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// range.
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assert(
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curr_level_ == 0 ||
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curr_index_in_curr_level_ == start_index_in_curr_level_ ||
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user_comparator_->Compare(user_key_,
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ExtractUserKey(f->smallest_key)) <= 0);
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int cmp_smallest = user_comparator_->Compare(user_key_,
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ExtractUserKey(f->smallest_key));
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if (cmp_smallest >= 0) {
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cmp_largest = user_comparator_->Compare(user_key_,
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ExtractUserKey(f->largest_key));
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}
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// Setup file search bound for the next level based on the
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// comparison results
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if (curr_level_ > 0) {
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file_indexer_->GetNextLevelIndex(curr_level_,
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curr_index_in_curr_level_,
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cmp_smallest, cmp_largest,
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&search_left_bound_,
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&search_right_bound_);
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}
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// Key falls out of current file's range
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if (cmp_smallest < 0 || cmp_largest > 0) {
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if (curr_level_ == 0) {
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++curr_index_in_curr_level_;
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continue;
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} else {
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// Search next level.
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break;
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}
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}
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}
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#ifndef NDEBUG
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// Sanity check to make sure that the files are correctly sorted
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if (prev_file_) {
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if (curr_level_ != 0) {
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int comp_sign = internal_comparator_->Compare(
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prev_file_->largest_key, f->smallest_key);
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assert(comp_sign < 0);
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} else {
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// level == 0, the current file cannot be newer than the previous
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// one. Use compressed data structure, has no attribute seqNo
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assert(curr_index_in_curr_level_ > 0);
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assert(!NewestFirstBySeqNo(files_[0][curr_index_in_curr_level_],
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files_[0][curr_index_in_curr_level_-1]));
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}
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}
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prev_file_ = f;
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#endif
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if (curr_level_ > 0 && cmp_largest < 0) {
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// No more files to search in this level.
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search_ended_ = !PrepareNextLevel();
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} else {
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++curr_index_in_curr_level_;
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}
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return f;
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}
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// Start searching next level.
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search_ended_ = !PrepareNextLevel();
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}
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// Search ended.
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return nullptr;
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}
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// getter for current file level
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// for GET_HIT_L0, GET_HIT_L1 & GET_HIT_L2_AND_UP counts
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unsigned int GetHitFileLevel() { return hit_file_level_; }
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private:
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unsigned int num_levels_;
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unsigned int curr_level_;
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unsigned int hit_file_level_;
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int32_t search_left_bound_;
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int32_t search_right_bound_;
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#ifndef NDEBUG
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std::vector<FileMetaData*>* files_;
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#endif
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autovector<LevelFilesBrief>* level_files_brief_;
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bool search_ended_;
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LevelFilesBrief* curr_file_level_;
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unsigned int curr_index_in_curr_level_;
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unsigned int start_index_in_curr_level_;
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Slice user_key_;
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Slice ikey_;
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FileIndexer* file_indexer_;
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const Comparator* user_comparator_;
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const InternalKeyComparator* internal_comparator_;
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#ifndef NDEBUG
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FdWithKeyRange* prev_file_;
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#endif
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// Setup local variables to search next level.
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// Returns false if there are no more levels to search.
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bool PrepareNextLevel() {
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curr_level_++;
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while (curr_level_ < num_levels_) {
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curr_file_level_ = &(*level_files_brief_)[curr_level_];
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if (curr_file_level_->num_files == 0) {
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// When current level is empty, the search bound generated from upper
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// level must be [0, -1] or [0, FileIndexer::kLevelMaxIndex] if it is
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// also empty.
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assert(search_left_bound_ == 0);
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assert(search_right_bound_ == -1 ||
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search_right_bound_ == FileIndexer::kLevelMaxIndex);
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// Since current level is empty, it will need to search all files in
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// the next level
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search_left_bound_ = 0;
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search_right_bound_ = FileIndexer::kLevelMaxIndex;
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curr_level_++;
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continue;
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}
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// Some files may overlap each other. We find
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// all files that overlap user_key and process them in order from
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// newest to oldest. In the context of merge-operator, this can occur at
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// any level. Otherwise, it only occurs at Level-0 (since Put/Deletes
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// are always compacted into a single entry).
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int32_t start_index;
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if (curr_level_ == 0) {
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// On Level-0, we read through all files to check for overlap.
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start_index = 0;
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} else {
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// On Level-n (n>=1), files are sorted. Binary search to find the
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// earliest file whose largest key >= ikey. Search left bound and
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// right bound are used to narrow the range.
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if (search_left_bound_ == search_right_bound_) {
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start_index = search_left_bound_;
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} else if (search_left_bound_ < search_right_bound_) {
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if (search_right_bound_ == FileIndexer::kLevelMaxIndex) {
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search_right_bound_ =
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static_cast<int32_t>(curr_file_level_->num_files) - 1;
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}
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start_index =
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FindFileInRange(*internal_comparator_, *curr_file_level_, ikey_,
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static_cast<uint32_t>(search_left_bound_),
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static_cast<uint32_t>(search_right_bound_));
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} else {
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// search_left_bound > search_right_bound, key does not exist in
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// this level. Since no comparison is done in this level, it will
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// need to search all files in the next level.
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search_left_bound_ = 0;
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search_right_bound_ = FileIndexer::kLevelMaxIndex;
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curr_level_++;
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continue;
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}
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}
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start_index_in_curr_level_ = start_index;
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curr_index_in_curr_level_ = start_index;
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#ifndef NDEBUG
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prev_file_ = nullptr;
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#endif
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return true;
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}
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// curr_level_ = num_levels_. So, no more levels to search.
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return false;
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}
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};
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} // anonymous namespace
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VersionStorageInfo::~VersionStorageInfo() { delete[] files_; }
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Version::~Version() {
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assert(refs_ == 0);
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// Remove from linked list
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prev_->next_ = next_;
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next_->prev_ = prev_;
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// Drop references to files
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for (int level = 0; level < storage_info_.num_levels_; level++) {
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for (size_t i = 0; i < storage_info_.files_[level].size(); i++) {
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FileMetaData* f = storage_info_.files_[level][i];
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assert(f->refs > 0);
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f->refs--;
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if (f->refs <= 0) {
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if (f->table_reader_handle) {
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cfd_->table_cache()->ReleaseHandle(f->table_reader_handle);
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f->table_reader_handle = nullptr;
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}
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vset_->obsolete_files_.push_back(f);
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}
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}
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}
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}
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int FindFile(const InternalKeyComparator& icmp,
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const LevelFilesBrief& file_level,
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const Slice& key) {
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return FindFileInRange(icmp, file_level, key, 0,
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static_cast<uint32_t>(file_level.num_files));
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}
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void DoGenerateLevelFilesBrief(LevelFilesBrief* file_level,
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const std::vector<FileMetaData*>& files,
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Arena* arena) {
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assert(file_level);
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assert(arena);
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size_t num = files.size();
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file_level->num_files = num;
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char* mem = arena->AllocateAligned(num * sizeof(FdWithKeyRange));
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file_level->files = new (mem)FdWithKeyRange[num];
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for (size_t i = 0; i < num; i++) {
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Slice smallest_key = files[i]->smallest.Encode();
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Slice largest_key = files[i]->largest.Encode();
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// Copy key slice to sequential memory
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size_t smallest_size = smallest_key.size();
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size_t largest_size = largest_key.size();
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mem = arena->AllocateAligned(smallest_size + largest_size);
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memcpy(mem, smallest_key.data(), smallest_size);
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memcpy(mem + smallest_size, largest_key.data(), largest_size);
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FdWithKeyRange& f = file_level->files[i];
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f.fd = files[i]->fd;
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f.smallest_key = Slice(mem, smallest_size);
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f.largest_key = Slice(mem + smallest_size, largest_size);
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}
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}
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static bool AfterFile(const Comparator* ucmp,
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const Slice* user_key, const FdWithKeyRange* f) {
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// nullptr user_key occurs before all keys and is therefore never after *f
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return (user_key != nullptr &&
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ucmp->Compare(*user_key, ExtractUserKey(f->largest_key)) > 0);
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}
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static bool BeforeFile(const Comparator* ucmp,
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const Slice* user_key, const FdWithKeyRange* f) {
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// nullptr user_key occurs after all keys and is therefore never before *f
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return (user_key != nullptr &&
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ucmp->Compare(*user_key, ExtractUserKey(f->smallest_key)) < 0);
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}
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bool SomeFileOverlapsRange(
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const InternalKeyComparator& icmp,
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bool disjoint_sorted_files,
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const LevelFilesBrief& file_level,
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const Slice* smallest_user_key,
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const Slice* largest_user_key) {
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const Comparator* ucmp = icmp.user_comparator();
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if (!disjoint_sorted_files) {
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// Need to check against all files
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for (size_t i = 0; i < file_level.num_files; i++) {
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const FdWithKeyRange* f = &(file_level.files[i]);
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if (AfterFile(ucmp, smallest_user_key, f) ||
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BeforeFile(ucmp, largest_user_key, f)) {
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// No overlap
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} else {
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return true; // Overlap
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}
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}
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return false;
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}
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// Binary search over file list
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uint32_t index = 0;
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if (smallest_user_key != nullptr) {
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// Find the earliest possible internal key for smallest_user_key
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InternalKey small;
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small.SetMaxPossibleForUserKey(*smallest_user_key);
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index = FindFile(icmp, file_level, small.Encode());
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}
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if (index >= file_level.num_files) {
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// beginning of range is after all files, so no overlap.
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return false;
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}
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return !BeforeFile(ucmp, largest_user_key, &file_level.files[index]);
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}
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namespace {
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// An internal iterator. For a given version/level pair, yields
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// information about the files in the level. For a given entry, key()
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// is the largest key that occurs in the file, and value() is an
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// 16-byte value containing the file number and file size, both
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// encoded using EncodeFixed64.
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class LevelFileNumIterator : public InternalIterator {
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public:
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LevelFileNumIterator(const InternalKeyComparator& icmp,
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const LevelFilesBrief* flevel)
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: icmp_(icmp),
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flevel_(flevel),
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index_(static_cast<uint32_t>(flevel->num_files)),
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current_value_(0, 0, 0) { // Marks as invalid
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}
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virtual bool Valid() const override { return index_ < flevel_->num_files; }
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virtual void Seek(const Slice& target) override {
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index_ = FindFile(icmp_, *flevel_, target);
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}
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virtual void SeekToFirst() override { index_ = 0; }
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virtual void SeekToLast() override {
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index_ = (flevel_->num_files == 0)
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? 0
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: static_cast<uint32_t>(flevel_->num_files) - 1;
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}
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virtual void Next() override {
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assert(Valid());
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index_++;
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}
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virtual void Prev() override {
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assert(Valid());
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if (index_ == 0) {
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index_ = static_cast<uint32_t>(flevel_->num_files); // Marks as invalid
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} else {
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index_--;
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}
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}
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Slice key() const override {
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assert(Valid());
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return flevel_->files[index_].largest_key;
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}
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Slice value() const override {
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assert(Valid());
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auto file_meta = flevel_->files[index_];
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current_value_ = file_meta.fd;
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return Slice(reinterpret_cast<const char*>(¤t_value_),
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sizeof(FileDescriptor));
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}
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virtual Status status() const override { return Status::OK(); }
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private:
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const InternalKeyComparator icmp_;
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const LevelFilesBrief* flevel_;
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uint32_t index_;
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mutable FileDescriptor current_value_;
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};
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class LevelFileIteratorState : public TwoLevelIteratorState {
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public:
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LevelFileIteratorState(TableCache* table_cache,
|
|
const ReadOptions& read_options,
|
|
const EnvOptions& env_options,
|
|
const InternalKeyComparator& icomparator,
|
|
HistogramImpl* file_read_hist, bool for_compaction,
|
|
bool prefix_enabled)
|
|
: TwoLevelIteratorState(prefix_enabled),
|
|
table_cache_(table_cache),
|
|
read_options_(read_options),
|
|
env_options_(env_options),
|
|
icomparator_(icomparator),
|
|
file_read_hist_(file_read_hist),
|
|
for_compaction_(for_compaction) {}
|
|
|
|
InternalIterator* NewSecondaryIterator(const Slice& meta_handle) override {
|
|
if (meta_handle.size() != sizeof(FileDescriptor)) {
|
|
return NewErrorInternalIterator(
|
|
Status::Corruption("FileReader invoked with unexpected value"));
|
|
} else {
|
|
const FileDescriptor* fd =
|
|
reinterpret_cast<const FileDescriptor*>(meta_handle.data());
|
|
return table_cache_->NewIterator(
|
|
read_options_, env_options_, icomparator_, *fd,
|
|
nullptr /* don't need reference to table*/, file_read_hist_,
|
|
for_compaction_);
|
|
}
|
|
}
|
|
|
|
bool PrefixMayMatch(const Slice& internal_key) override {
|
|
return true;
|
|
}
|
|
|
|
private:
|
|
TableCache* table_cache_;
|
|
const ReadOptions read_options_;
|
|
const EnvOptions& env_options_;
|
|
const InternalKeyComparator& icomparator_;
|
|
HistogramImpl* file_read_hist_;
|
|
bool for_compaction_;
|
|
};
|
|
|
|
// A wrapper of version builder which references the current version in
|
|
// constructor and unref it in the destructor.
|
|
// Both of the constructor and destructor need to be called inside DB Mutex.
|
|
class BaseReferencedVersionBuilder {
|
|
public:
|
|
explicit BaseReferencedVersionBuilder(ColumnFamilyData* cfd)
|
|
: version_builder_(new VersionBuilder(
|
|
cfd->current()->version_set()->env_options(), cfd->table_cache(),
|
|
cfd->current()->storage_info())),
|
|
version_(cfd->current()) {
|
|
version_->Ref();
|
|
}
|
|
~BaseReferencedVersionBuilder() {
|
|
delete version_builder_;
|
|
version_->Unref();
|
|
}
|
|
VersionBuilder* version_builder() { return version_builder_; }
|
|
|
|
private:
|
|
VersionBuilder* version_builder_;
|
|
Version* version_;
|
|
};
|
|
} // anonymous namespace
|
|
|
|
Status Version::GetTableProperties(std::shared_ptr<const TableProperties>* tp,
|
|
const FileMetaData* file_meta,
|
|
const std::string* fname) {
|
|
auto table_cache = cfd_->table_cache();
|
|
auto ioptions = cfd_->ioptions();
|
|
Status s = table_cache->GetTableProperties(
|
|
vset_->env_options_, cfd_->internal_comparator(), file_meta->fd,
|
|
tp, true /* no io */);
|
|
if (s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
// We only ignore error type `Incomplete` since it's by design that we
|
|
// disallow table when it's not in table cache.
|
|
if (!s.IsIncomplete()) {
|
|
return s;
|
|
}
|
|
|
|
// 2. Table is not present in table cache, we'll read the table properties
|
|
// directly from the properties block in the file.
|
|
std::unique_ptr<RandomAccessFile> file;
|
|
if (fname != nullptr) {
|
|
s = ioptions->env->NewRandomAccessFile(
|
|
*fname, &file, vset_->env_options_);
|
|
} else {
|
|
s = ioptions->env->NewRandomAccessFile(
|
|
TableFileName(vset_->db_options_->db_paths, file_meta->fd.GetNumber(),
|
|
file_meta->fd.GetPathId()),
|
|
&file, vset_->env_options_);
|
|
}
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
TableProperties* raw_table_properties;
|
|
// By setting the magic number to kInvalidTableMagicNumber, we can by
|
|
// pass the magic number check in the footer.
|
|
std::unique_ptr<RandomAccessFileReader> file_reader(
|
|
new RandomAccessFileReader(std::move(file)));
|
|
s = ReadTableProperties(
|
|
file_reader.get(), file_meta->fd.GetFileSize(),
|
|
Footer::kInvalidTableMagicNumber /* table's magic number */, vset_->env_,
|
|
ioptions->info_log, &raw_table_properties);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
RecordTick(ioptions->statistics, NUMBER_DIRECT_LOAD_TABLE_PROPERTIES);
|
|
|
|
*tp = std::shared_ptr<const TableProperties>(raw_table_properties);
|
|
return s;
|
|
}
|
|
|
|
Status Version::GetPropertiesOfAllTables(TablePropertiesCollection* props) {
|
|
Status s;
|
|
for (int level = 0; level < storage_info_.num_levels_; level++) {
|
|
s = GetPropertiesOfAllTables(props, level);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
}
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
Status Version::GetPropertiesOfAllTables(TablePropertiesCollection* props,
|
|
int level) {
|
|
for (const auto& file_meta : storage_info_.files_[level]) {
|
|
auto fname =
|
|
TableFileName(vset_->db_options_->db_paths, file_meta->fd.GetNumber(),
|
|
file_meta->fd.GetPathId());
|
|
// 1. If the table is already present in table cache, load table
|
|
// properties from there.
|
|
std::shared_ptr<const TableProperties> table_properties;
|
|
Status s = GetTableProperties(&table_properties, file_meta, &fname);
|
|
if (s.ok()) {
|
|
props->insert({fname, table_properties});
|
|
} else {
|
|
return s;
|
|
}
|
|
}
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
Status Version::GetAggregatedTableProperties(
|
|
std::shared_ptr<const TableProperties>* tp, int level) {
|
|
TablePropertiesCollection props;
|
|
Status s;
|
|
if (level < 0) {
|
|
s = GetPropertiesOfAllTables(&props);
|
|
} else {
|
|
s = GetPropertiesOfAllTables(&props, level);
|
|
}
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
auto* new_tp = new TableProperties();
|
|
for (const auto& item : props) {
|
|
new_tp->Add(*item.second);
|
|
}
|
|
tp->reset(new_tp);
|
|
return Status::OK();
|
|
}
|
|
|
|
size_t Version::GetMemoryUsageByTableReaders() {
|
|
size_t total_usage = 0;
|
|
for (auto& file_level : storage_info_.level_files_brief_) {
|
|
for (size_t i = 0; i < file_level.num_files; i++) {
|
|
total_usage += cfd_->table_cache()->GetMemoryUsageByTableReader(
|
|
vset_->env_options_, cfd_->internal_comparator(),
|
|
file_level.files[i].fd);
|
|
}
|
|
}
|
|
return total_usage;
|
|
}
|
|
|
|
void Version::GetColumnFamilyMetaData(ColumnFamilyMetaData* cf_meta) {
|
|
assert(cf_meta);
|
|
assert(cfd_);
|
|
|
|
cf_meta->name = cfd_->GetName();
|
|
cf_meta->size = 0;
|
|
cf_meta->file_count = 0;
|
|
cf_meta->levels.clear();
|
|
|
|
auto* ioptions = cfd_->ioptions();
|
|
auto* vstorage = storage_info();
|
|
|
|
for (int level = 0; level < cfd_->NumberLevels(); level++) {
|
|
uint64_t level_size = 0;
|
|
cf_meta->file_count += vstorage->LevelFiles(level).size();
|
|
std::vector<SstFileMetaData> files;
|
|
for (const auto& file : vstorage->LevelFiles(level)) {
|
|
uint32_t path_id = file->fd.GetPathId();
|
|
std::string file_path;
|
|
if (path_id < ioptions->db_paths.size()) {
|
|
file_path = ioptions->db_paths[path_id].path;
|
|
} else {
|
|
assert(!ioptions->db_paths.empty());
|
|
file_path = ioptions->db_paths.back().path;
|
|
}
|
|
files.emplace_back(
|
|
MakeTableFileName("", file->fd.GetNumber()),
|
|
file_path,
|
|
file->fd.GetFileSize(),
|
|
file->smallest_seqno,
|
|
file->largest_seqno,
|
|
file->smallest.user_key().ToString(),
|
|
file->largest.user_key().ToString(),
|
|
file->being_compacted);
|
|
level_size += file->fd.GetFileSize();
|
|
}
|
|
cf_meta->levels.emplace_back(
|
|
level, level_size, std::move(files));
|
|
cf_meta->size += level_size;
|
|
}
|
|
}
|
|
|
|
|
|
uint64_t VersionStorageInfo::GetEstimatedActiveKeys() const {
|
|
// Estimation will be inaccurate when:
|
|
// (1) there exist merge keys
|
|
// (2) keys are directly overwritten
|
|
// (3) deletion on non-existing keys
|
|
// (4) low number of samples
|
|
if (num_samples_ == 0) {
|
|
return 0;
|
|
}
|
|
|
|
if (accumulated_num_non_deletions_ <= accumulated_num_deletions_) {
|
|
return 0;
|
|
}
|
|
|
|
uint64_t est = accumulated_num_non_deletions_ - accumulated_num_deletions_;
|
|
|
|
uint64_t file_count = 0;
|
|
for (int level = 0; level < num_levels_; ++level) {
|
|
file_count += files_[level].size();
|
|
}
|
|
|
|
if (num_samples_ < file_count) {
|
|
// casting to avoid overflowing
|
|
return (est * static_cast<double>(file_count) / num_samples_);
|
|
} else {
|
|
return est;
|
|
}
|
|
}
|
|
|
|
void Version::AddIterators(const ReadOptions& read_options,
|
|
const EnvOptions& soptions,
|
|
MergeIteratorBuilder* merge_iter_builder) {
|
|
assert(storage_info_.finalized_);
|
|
|
|
if (storage_info_.num_non_empty_levels() == 0) {
|
|
// No file in the Version.
|
|
return;
|
|
}
|
|
|
|
auto* arena = merge_iter_builder->GetArena();
|
|
|
|
// Merge all level zero files together since they may overlap
|
|
for (size_t i = 0; i < storage_info_.LevelFilesBrief(0).num_files; i++) {
|
|
const auto& file = storage_info_.LevelFilesBrief(0).files[i];
|
|
merge_iter_builder->AddIterator(cfd_->table_cache()->NewIterator(
|
|
read_options, soptions, cfd_->internal_comparator(), file.fd, nullptr,
|
|
cfd_->internal_stats()->GetFileReadHist(0), false, arena));
|
|
}
|
|
|
|
// For levels > 0, we can use a concatenating iterator that sequentially
|
|
// walks through the non-overlapping files in the level, opening them
|
|
// lazily.
|
|
for (int level = 1; level < storage_info_.num_non_empty_levels(); level++) {
|
|
if (storage_info_.LevelFilesBrief(level).num_files != 0) {
|
|
auto* mem = arena->AllocateAligned(sizeof(LevelFileIteratorState));
|
|
auto* state = new (mem)
|
|
LevelFileIteratorState(cfd_->table_cache(), read_options, soptions,
|
|
cfd_->internal_comparator(),
|
|
cfd_->internal_stats()->GetFileReadHist(level),
|
|
false /* for_compaction */,
|
|
cfd_->ioptions()->prefix_extractor != nullptr);
|
|
mem = arena->AllocateAligned(sizeof(LevelFileNumIterator));
|
|
auto* first_level_iter = new (mem) LevelFileNumIterator(
|
|
cfd_->internal_comparator(), &storage_info_.LevelFilesBrief(level));
|
|
merge_iter_builder->AddIterator(
|
|
NewTwoLevelIterator(state, first_level_iter, arena, false));
|
|
}
|
|
}
|
|
}
|
|
|
|
VersionStorageInfo::VersionStorageInfo(
|
|
const InternalKeyComparator* internal_comparator,
|
|
const Comparator* user_comparator, int levels,
|
|
CompactionStyle compaction_style, VersionStorageInfo* ref_vstorage)
|
|
: internal_comparator_(internal_comparator),
|
|
user_comparator_(user_comparator),
|
|
// cfd is nullptr if Version is dummy
|
|
num_levels_(levels),
|
|
num_non_empty_levels_(0),
|
|
file_indexer_(user_comparator),
|
|
compaction_style_(compaction_style),
|
|
files_(new std::vector<FileMetaData*>[num_levels_]),
|
|
base_level_(num_levels_ == 1 ? -1 : 1),
|
|
files_by_compaction_pri_(num_levels_),
|
|
level0_non_overlapping_(false),
|
|
next_file_to_compact_by_size_(num_levels_),
|
|
compaction_score_(num_levels_),
|
|
compaction_level_(num_levels_),
|
|
l0_delay_trigger_count_(0),
|
|
accumulated_file_size_(0),
|
|
accumulated_raw_key_size_(0),
|
|
accumulated_raw_value_size_(0),
|
|
accumulated_num_non_deletions_(0),
|
|
accumulated_num_deletions_(0),
|
|
num_samples_(0),
|
|
estimated_compaction_needed_bytes_(0),
|
|
finalized_(false) {
|
|
if (ref_vstorage != nullptr) {
|
|
accumulated_file_size_ = ref_vstorage->accumulated_file_size_;
|
|
accumulated_raw_key_size_ = ref_vstorage->accumulated_raw_key_size_;
|
|
accumulated_raw_value_size_ = ref_vstorage->accumulated_raw_value_size_;
|
|
accumulated_num_non_deletions_ =
|
|
ref_vstorage->accumulated_num_non_deletions_;
|
|
accumulated_num_deletions_ = ref_vstorage->accumulated_num_deletions_;
|
|
num_samples_ = ref_vstorage->num_samples_;
|
|
}
|
|
}
|
|
|
|
Version::Version(ColumnFamilyData* column_family_data, VersionSet* vset,
|
|
uint64_t version_number)
|
|
: env_(vset->env_),
|
|
cfd_(column_family_data),
|
|
info_log_((cfd_ == nullptr) ? nullptr : cfd_->ioptions()->info_log),
|
|
db_statistics_((cfd_ == nullptr) ? nullptr
|
|
: cfd_->ioptions()->statistics),
|
|
table_cache_((cfd_ == nullptr) ? nullptr : cfd_->table_cache()),
|
|
merge_operator_((cfd_ == nullptr) ? nullptr
|
|
: cfd_->ioptions()->merge_operator),
|
|
storage_info_((cfd_ == nullptr) ? nullptr : &cfd_->internal_comparator(),
|
|
(cfd_ == nullptr) ? nullptr : cfd_->user_comparator(),
|
|
cfd_ == nullptr ? 0 : cfd_->NumberLevels(),
|
|
cfd_ == nullptr ? kCompactionStyleLevel
|
|
: cfd_->ioptions()->compaction_style,
|
|
(cfd_ == nullptr || cfd_->current() == nullptr)
|
|
? nullptr
|
|
: cfd_->current()->storage_info()),
|
|
vset_(vset),
|
|
next_(this),
|
|
prev_(this),
|
|
refs_(0),
|
|
version_number_(version_number) {}
|
|
|
|
void Version::Get(const ReadOptions& read_options,
|
|
const LookupKey& k,
|
|
std::string* value,
|
|
Status* status,
|
|
MergeContext* merge_context,
|
|
bool* value_found) {
|
|
Slice ikey = k.internal_key();
|
|
Slice user_key = k.user_key();
|
|
|
|
assert(status->ok() || status->IsMergeInProgress());
|
|
|
|
GetContext get_context(
|
|
user_comparator(), merge_operator_, info_log_, db_statistics_,
|
|
status->ok() ? GetContext::kNotFound : GetContext::kMerge, user_key,
|
|
value, value_found, merge_context, this->env_);
|
|
|
|
FilePicker fp(
|
|
storage_info_.files_, user_key, ikey, &storage_info_.level_files_brief_,
|
|
storage_info_.num_non_empty_levels_, &storage_info_.file_indexer_,
|
|
user_comparator(), internal_comparator());
|
|
FdWithKeyRange* f = fp.GetNextFile();
|
|
while (f != nullptr) {
|
|
*status = table_cache_->Get(
|
|
read_options, *internal_comparator(), f->fd, ikey, &get_context,
|
|
cfd_->internal_stats()->GetFileReadHist(fp.GetHitFileLevel()));
|
|
// TODO: examine the behavior for corrupted key
|
|
if (!status->ok()) {
|
|
return;
|
|
}
|
|
|
|
switch (get_context.State()) {
|
|
case GetContext::kNotFound:
|
|
// Keep searching in other files
|
|
break;
|
|
case GetContext::kFound:
|
|
if (fp.GetHitFileLevel() == 0) {
|
|
RecordTick(db_statistics_, GET_HIT_L0);
|
|
} else if (fp.GetHitFileLevel() == 1) {
|
|
RecordTick(db_statistics_, GET_HIT_L1);
|
|
} else if (fp.GetHitFileLevel() >= 2) {
|
|
RecordTick(db_statistics_, GET_HIT_L2_AND_UP);
|
|
}
|
|
return;
|
|
case GetContext::kDeleted:
|
|
// Use empty error message for speed
|
|
*status = Status::NotFound();
|
|
return;
|
|
case GetContext::kCorrupt:
|
|
*status = Status::Corruption("corrupted key for ", user_key);
|
|
return;
|
|
case GetContext::kMerge:
|
|
break;
|
|
}
|
|
f = fp.GetNextFile();
|
|
}
|
|
|
|
if (GetContext::kMerge == get_context.State()) {
|
|
if (!merge_operator_) {
|
|
*status = Status::InvalidArgument(
|
|
"merge_operator is not properly initialized.");
|
|
return;
|
|
}
|
|
// merge_operands are in saver and we hit the beginning of the key history
|
|
// do a final merge of nullptr and operands;
|
|
if (merge_operator_->FullMerge(user_key, nullptr,
|
|
merge_context->GetOperands(), value,
|
|
info_log_)) {
|
|
*status = Status::OK();
|
|
} else {
|
|
RecordTick(db_statistics_, NUMBER_MERGE_FAILURES);
|
|
*status = Status::Corruption("could not perform end-of-key merge for ",
|
|
user_key);
|
|
}
|
|
} else {
|
|
*status = Status::NotFound(); // Use an empty error message for speed
|
|
}
|
|
}
|
|
|
|
void VersionStorageInfo::GenerateLevelFilesBrief() {
|
|
level_files_brief_.resize(num_non_empty_levels_);
|
|
for (int level = 0; level < num_non_empty_levels_; level++) {
|
|
DoGenerateLevelFilesBrief(
|
|
&level_files_brief_[level], files_[level], &arena_);
|
|
}
|
|
}
|
|
|
|
void Version::PrepareApply(
|
|
const MutableCFOptions& mutable_cf_options,
|
|
bool update_stats) {
|
|
UpdateAccumulatedStats(update_stats);
|
|
storage_info_.UpdateNumNonEmptyLevels();
|
|
storage_info_.CalculateBaseBytes(*cfd_->ioptions(), mutable_cf_options);
|
|
storage_info_.UpdateFilesByCompactionPri(mutable_cf_options);
|
|
storage_info_.GenerateFileIndexer();
|
|
storage_info_.GenerateLevelFilesBrief();
|
|
storage_info_.GenerateLevel0NonOverlapping();
|
|
}
|
|
|
|
bool Version::MaybeInitializeFileMetaData(FileMetaData* file_meta) {
|
|
if (file_meta->init_stats_from_file ||
|
|
file_meta->compensated_file_size > 0) {
|
|
return false;
|
|
}
|
|
std::shared_ptr<const TableProperties> tp;
|
|
Status s = GetTableProperties(&tp, file_meta);
|
|
file_meta->init_stats_from_file = true;
|
|
if (!s.ok()) {
|
|
Log(InfoLogLevel::ERROR_LEVEL, vset_->db_options_->info_log,
|
|
"Unable to load table properties for file %" PRIu64 " --- %s\n",
|
|
file_meta->fd.GetNumber(), s.ToString().c_str());
|
|
return false;
|
|
}
|
|
if (tp.get() == nullptr) return false;
|
|
file_meta->num_entries = tp->num_entries;
|
|
file_meta->num_deletions = GetDeletedKeys(tp->user_collected_properties);
|
|
file_meta->raw_value_size = tp->raw_value_size;
|
|
file_meta->raw_key_size = tp->raw_key_size;
|
|
|
|
return true;
|
|
}
|
|
|
|
void VersionStorageInfo::UpdateAccumulatedStats(FileMetaData* file_meta) {
|
|
assert(file_meta->init_stats_from_file);
|
|
accumulated_file_size_ += file_meta->fd.GetFileSize();
|
|
accumulated_raw_key_size_ += file_meta->raw_key_size;
|
|
accumulated_raw_value_size_ += file_meta->raw_value_size;
|
|
accumulated_num_non_deletions_ +=
|
|
file_meta->num_entries - file_meta->num_deletions;
|
|
accumulated_num_deletions_ += file_meta->num_deletions;
|
|
num_samples_++;
|
|
}
|
|
|
|
void Version::UpdateAccumulatedStats(bool update_stats) {
|
|
if (update_stats) {
|
|
// maximum number of table properties loaded from files.
|
|
const int kMaxInitCount = 20;
|
|
int init_count = 0;
|
|
// here only the first kMaxInitCount files which haven't been
|
|
// initialized from file will be updated with num_deletions.
|
|
// The motivation here is to cap the maximum I/O per Version creation.
|
|
// The reason for choosing files from lower-level instead of higher-level
|
|
// is that such design is able to propagate the initialization from
|
|
// lower-level to higher-level: When the num_deletions of lower-level
|
|
// files are updated, it will make the lower-level files have accurate
|
|
// compensated_file_size, making lower-level to higher-level compaction
|
|
// will be triggered, which creates higher-level files whose num_deletions
|
|
// will be updated here.
|
|
for (int level = 0;
|
|
level < storage_info_.num_levels_ && init_count < kMaxInitCount;
|
|
++level) {
|
|
for (auto* file_meta : storage_info_.files_[level]) {
|
|
if (MaybeInitializeFileMetaData(file_meta)) {
|
|
// each FileMeta will be initialized only once.
|
|
storage_info_.UpdateAccumulatedStats(file_meta);
|
|
if (++init_count >= kMaxInitCount) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
// In case all sampled-files contain only deletion entries, then we
|
|
// load the table-property of a file in higher-level to initialize
|
|
// that value.
|
|
for (int level = storage_info_.num_levels_ - 1;
|
|
storage_info_.accumulated_raw_value_size_ == 0 && level >= 0;
|
|
--level) {
|
|
for (int i = static_cast<int>(storage_info_.files_[level].size()) - 1;
|
|
storage_info_.accumulated_raw_value_size_ == 0 && i >= 0; --i) {
|
|
if (MaybeInitializeFileMetaData(storage_info_.files_[level][i])) {
|
|
storage_info_.UpdateAccumulatedStats(storage_info_.files_[level][i]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
storage_info_.ComputeCompensatedSizes();
|
|
}
|
|
|
|
void VersionStorageInfo::ComputeCompensatedSizes() {
|
|
static const int kDeletionWeightOnCompaction = 2;
|
|
uint64_t average_value_size = GetAverageValueSize();
|
|
|
|
// compute the compensated size
|
|
for (int level = 0; level < num_levels_; level++) {
|
|
for (auto* file_meta : files_[level]) {
|
|
// Here we only compute compensated_file_size for those file_meta
|
|
// which compensated_file_size is uninitialized (== 0). This is true only
|
|
// for files that have been created right now and no other thread has
|
|
// access to them. That's why we can safely mutate compensated_file_size.
|
|
if (file_meta->compensated_file_size == 0) {
|
|
file_meta->compensated_file_size = file_meta->fd.GetFileSize();
|
|
// Here we only boost the size of deletion entries of a file only
|
|
// when the number of deletion entries is greater than the number of
|
|
// non-deletion entries in the file. The motivation here is that in
|
|
// a stable workload, the number of deletion entries should be roughly
|
|
// equal to the number of non-deletion entries. If we compensate the
|
|
// size of deletion entries in a stable workload, the deletion
|
|
// compensation logic might introduce unwanted effet which changes the
|
|
// shape of LSM tree.
|
|
if (file_meta->num_deletions * 2 >= file_meta->num_entries) {
|
|
file_meta->compensated_file_size +=
|
|
(file_meta->num_deletions * 2 - file_meta->num_entries) *
|
|
average_value_size * kDeletionWeightOnCompaction;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
int VersionStorageInfo::MaxInputLevel() const {
|
|
if (compaction_style_ == kCompactionStyleLevel) {
|
|
return num_levels() - 2;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void VersionStorageInfo::EstimateCompactionBytesNeeded(
|
|
const MutableCFOptions& mutable_cf_options) {
|
|
// Only implemented for level-based compaction
|
|
if (compaction_style_ != kCompactionStyleLevel) {
|
|
return;
|
|
}
|
|
|
|
// Start from Level 0, if level 0 qualifies compaction to level 1,
|
|
// we estimate the size of compaction.
|
|
// Then we move on to the next level and see whether it qualifies compaction
|
|
// to the next level. The size of the level is estimated as the actual size
|
|
// on the level plus the input bytes from the previous level if there is any.
|
|
// If it exceeds, take the exceeded bytes as compaction input and add the size
|
|
// of the compaction size to tatal size.
|
|
// We keep doing it to Level 2, 3, etc, until the last level and return the
|
|
// accumulated bytes.
|
|
|
|
size_t bytes_compact_to_next_level = 0;
|
|
// Level 0
|
|
bool level0_compact_triggered = false;
|
|
if (static_cast<int>(files_[0].size()) >
|
|
mutable_cf_options.level0_file_num_compaction_trigger) {
|
|
level0_compact_triggered = true;
|
|
for (auto* f : files_[0]) {
|
|
bytes_compact_to_next_level += f->fd.GetFileSize();
|
|
}
|
|
estimated_compaction_needed_bytes_ = bytes_compact_to_next_level;
|
|
} else {
|
|
estimated_compaction_needed_bytes_ = 0;
|
|
}
|
|
|
|
// Level 1 and up.
|
|
for (int level = base_level(); level <= MaxInputLevel(); level++) {
|
|
size_t level_size = 0;
|
|
for (auto* f : files_[level]) {
|
|
level_size += f->fd.GetFileSize();
|
|
}
|
|
if (level == base_level() && level0_compact_triggered) {
|
|
// Add base level size to compaction if level0 compaction triggered.
|
|
estimated_compaction_needed_bytes_ += level_size;
|
|
}
|
|
// Add size added by previous compaction
|
|
level_size += bytes_compact_to_next_level;
|
|
bytes_compact_to_next_level = 0;
|
|
size_t level_target = MaxBytesForLevel(level);
|
|
if (level_size > level_target) {
|
|
bytes_compact_to_next_level = level_size - level_target;
|
|
// Simplify to assume the actual compaction fan-out ratio is always
|
|
// mutable_cf_options.max_bytes_for_level_multiplier.
|
|
estimated_compaction_needed_bytes_ +=
|
|
bytes_compact_to_next_level *
|
|
(1 + mutable_cf_options.max_bytes_for_level_multiplier);
|
|
}
|
|
}
|
|
}
|
|
|
|
void VersionStorageInfo::ComputeCompactionScore(
|
|
const MutableCFOptions& mutable_cf_options,
|
|
const CompactionOptionsFIFO& compaction_options_fifo) {
|
|
double max_score = 0;
|
|
int max_score_level = 0;
|
|
|
|
for (int level = 0; level <= MaxInputLevel(); level++) {
|
|
double score;
|
|
if (level == 0) {
|
|
// We treat level-0 specially by bounding the number of files
|
|
// instead of number of bytes for two reasons:
|
|
//
|
|
// (1) With larger write-buffer sizes, it is nice not to do too
|
|
// many level-0 compactions.
|
|
//
|
|
// (2) The files in level-0 are merged on every read and
|
|
// therefore we wish to avoid too many files when the individual
|
|
// file size is small (perhaps because of a small write-buffer
|
|
// setting, or very high compression ratios, or lots of
|
|
// overwrites/deletions).
|
|
int num_sorted_runs = 0;
|
|
uint64_t total_size = 0;
|
|
for (auto* f : files_[level]) {
|
|
if (!f->being_compacted) {
|
|
total_size += f->compensated_file_size;
|
|
num_sorted_runs++;
|
|
}
|
|
}
|
|
if (compaction_style_ == kCompactionStyleUniversal) {
|
|
// For universal compaction, we use level0 score to indicate
|
|
// compaction score for the whole DB. Adding other levels as if
|
|
// they are L0 files.
|
|
for (int i = 1; i < num_levels(); i++) {
|
|
if (!files_[i].empty() && !files_[i][0]->being_compacted) {
|
|
num_sorted_runs++;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (compaction_style_ == kCompactionStyleFIFO) {
|
|
score = static_cast<double>(total_size) /
|
|
compaction_options_fifo.max_table_files_size;
|
|
} else {
|
|
score = static_cast<double>(num_sorted_runs) /
|
|
mutable_cf_options.level0_file_num_compaction_trigger;
|
|
}
|
|
} else {
|
|
// Compute the ratio of current size to size limit.
|
|
uint64_t level_bytes_no_compacting = 0;
|
|
for (auto f : files_[level]) {
|
|
if (!f->being_compacted) {
|
|
level_bytes_no_compacting += f->compensated_file_size;
|
|
}
|
|
}
|
|
score = static_cast<double>(level_bytes_no_compacting) /
|
|
MaxBytesForLevel(level);
|
|
if (max_score < score) {
|
|
max_score = score;
|
|
max_score_level = level;
|
|
}
|
|
}
|
|
compaction_level_[level] = level;
|
|
compaction_score_[level] = score;
|
|
}
|
|
|
|
// update the max compaction score in levels 1 to n-1
|
|
max_compaction_score_ = max_score;
|
|
max_compaction_score_level_ = max_score_level;
|
|
|
|
// sort all the levels based on their score. Higher scores get listed
|
|
// first. Use bubble sort because the number of entries are small.
|
|
for (int i = 0; i < num_levels() - 2; i++) {
|
|
for (int j = i + 1; j < num_levels() - 1; j++) {
|
|
if (compaction_score_[i] < compaction_score_[j]) {
|
|
double score = compaction_score_[i];
|
|
int level = compaction_level_[i];
|
|
compaction_score_[i] = compaction_score_[j];
|
|
compaction_level_[i] = compaction_level_[j];
|
|
compaction_score_[j] = score;
|
|
compaction_level_[j] = level;
|
|
}
|
|
}
|
|
}
|
|
ComputeFilesMarkedForCompaction();
|
|
EstimateCompactionBytesNeeded(mutable_cf_options);
|
|
}
|
|
|
|
void VersionStorageInfo::ComputeFilesMarkedForCompaction() {
|
|
files_marked_for_compaction_.clear();
|
|
int last_qualify_level = 0;
|
|
|
|
// Do not include files from the last level with data
|
|
// If table properties collector suggests a file on the last level,
|
|
// we should not move it to a new level.
|
|
for (int level = num_levels() - 1; level >= 1; level--) {
|
|
if (!files_[level].empty()) {
|
|
last_qualify_level = level - 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
for (int level = 0; level <= last_qualify_level; level++) {
|
|
for (auto* f : files_[level]) {
|
|
if (!f->being_compacted && f->marked_for_compaction) {
|
|
files_marked_for_compaction_.emplace_back(level, f);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
namespace {
|
|
|
|
// used to sort files by size
|
|
struct Fsize {
|
|
int index;
|
|
FileMetaData* file;
|
|
};
|
|
|
|
// Compator that is used to sort files based on their size
|
|
// In normal mode: descending size
|
|
bool CompareCompensatedSizeDescending(const Fsize& first, const Fsize& second) {
|
|
return (first.file->compensated_file_size >
|
|
second.file->compensated_file_size);
|
|
}
|
|
} // anonymous namespace
|
|
|
|
void VersionStorageInfo::AddFile(int level, FileMetaData* f) {
|
|
auto* level_files = &files_[level];
|
|
// Must not overlap
|
|
assert(level <= 0 || level_files->empty() ||
|
|
internal_comparator_->Compare(
|
|
(*level_files)[level_files->size() - 1]->largest, f->smallest) <
|
|
0);
|
|
f->refs++;
|
|
level_files->push_back(f);
|
|
}
|
|
|
|
// Version::PrepareApply() need to be called before calling the function, or
|
|
// following functions called:
|
|
// 1. UpdateNumNonEmptyLevels();
|
|
// 2. CalculateBaseBytes();
|
|
// 3. UpdateFilesByCompactionPri();
|
|
// 4. GenerateFileIndexer();
|
|
// 5. GenerateLevelFilesBrief();
|
|
// 6. GenerateLevel0NonOverlapping();
|
|
void VersionStorageInfo::SetFinalized() {
|
|
finalized_ = true;
|
|
#ifndef NDEBUG
|
|
if (compaction_style_ != kCompactionStyleLevel) {
|
|
// Not level based compaction.
|
|
return;
|
|
}
|
|
assert(base_level_ < 0 || num_levels() == 1 ||
|
|
(base_level_ >= 1 && base_level_ < num_levels()));
|
|
// Verify all levels newer than base_level are empty except L0
|
|
for (int level = 1; level < base_level(); level++) {
|
|
assert(NumLevelBytes(level) == 0);
|
|
}
|
|
uint64_t max_bytes_prev_level = 0;
|
|
for (int level = base_level(); level < num_levels() - 1; level++) {
|
|
if (LevelFiles(level).size() == 0) {
|
|
continue;
|
|
}
|
|
assert(MaxBytesForLevel(level) >= max_bytes_prev_level);
|
|
max_bytes_prev_level = MaxBytesForLevel(level);
|
|
}
|
|
int num_empty_non_l0_level = 0;
|
|
for (int level = 0; level < num_levels(); level++) {
|
|
assert(LevelFiles(level).size() == 0 ||
|
|
LevelFiles(level).size() == LevelFilesBrief(level).num_files);
|
|
if (level > 0 && NumLevelBytes(level) > 0) {
|
|
num_empty_non_l0_level++;
|
|
}
|
|
if (LevelFiles(level).size() > 0) {
|
|
assert(level < num_non_empty_levels());
|
|
}
|
|
}
|
|
assert(compaction_level_.size() > 0);
|
|
assert(compaction_level_.size() == compaction_score_.size());
|
|
#endif
|
|
}
|
|
|
|
void VersionStorageInfo::UpdateNumNonEmptyLevels() {
|
|
num_non_empty_levels_ = num_levels_;
|
|
for (int i = num_levels_ - 1; i >= 0; i--) {
|
|
if (files_[i].size() != 0) {
|
|
return;
|
|
} else {
|
|
num_non_empty_levels_ = i;
|
|
}
|
|
}
|
|
}
|
|
|
|
void VersionStorageInfo::UpdateFilesByCompactionPri(
|
|
const MutableCFOptions& mutable_cf_options) {
|
|
if (compaction_style_ == kCompactionStyleFIFO ||
|
|
compaction_style_ == kCompactionStyleUniversal) {
|
|
// don't need this
|
|
return;
|
|
}
|
|
// No need to sort the highest level because it is never compacted.
|
|
for (int level = 0; level < num_levels() - 1; level++) {
|
|
const std::vector<FileMetaData*>& files = files_[level];
|
|
auto& files_by_compaction_pri = files_by_compaction_pri_[level];
|
|
assert(files_by_compaction_pri.size() == 0);
|
|
|
|
// populate a temp vector for sorting based on size
|
|
std::vector<Fsize> temp(files.size());
|
|
for (unsigned int i = 0; i < files.size(); i++) {
|
|
temp[i].index = i;
|
|
temp[i].file = files[i];
|
|
}
|
|
|
|
// sort the top number_of_files_to_sort_ based on file size
|
|
size_t num = VersionStorageInfo::kNumberFilesToSort;
|
|
if (num > temp.size()) {
|
|
num = temp.size();
|
|
}
|
|
switch (mutable_cf_options.compaction_pri) {
|
|
case kCompactionPriByCompensatedSize:
|
|
std::partial_sort(temp.begin(), temp.begin() + num, temp.end(),
|
|
CompareCompensatedSizeDescending);
|
|
break;
|
|
case kCompactionPriByLargestSeq:
|
|
std::sort(temp.begin(), temp.end(),
|
|
[this](const Fsize& f1, const Fsize& f2) -> bool {
|
|
return f1.file->largest_seqno < f2.file->largest_seqno;
|
|
});
|
|
break;
|
|
default:
|
|
assert(false);
|
|
}
|
|
assert(temp.size() == files.size());
|
|
|
|
// initialize files_by_compaction_pri_
|
|
for (unsigned int i = 0; i < temp.size(); i++) {
|
|
files_by_compaction_pri.push_back(temp[i].index);
|
|
}
|
|
next_file_to_compact_by_size_[level] = 0;
|
|
assert(files_[level].size() == files_by_compaction_pri_[level].size());
|
|
}
|
|
}
|
|
|
|
void VersionStorageInfo::GenerateLevel0NonOverlapping() {
|
|
assert(!finalized_);
|
|
level0_non_overlapping_ = true;
|
|
if (level_files_brief_.size() == 0) {
|
|
return;
|
|
}
|
|
|
|
// A copy of L0 files sorted by smallest key
|
|
std::vector<FdWithKeyRange> level0_sorted_file(
|
|
level_files_brief_[0].files,
|
|
level_files_brief_[0].files + level_files_brief_[0].num_files);
|
|
sort(level0_sorted_file.begin(), level0_sorted_file.end(),
|
|
[this](const FdWithKeyRange & f1, const FdWithKeyRange & f2)->bool {
|
|
return (internal_comparator_->Compare(f1.smallest_key, f2.smallest_key) <
|
|
0);
|
|
});
|
|
|
|
for (size_t i = 1; i < level0_sorted_file.size(); ++i) {
|
|
FdWithKeyRange& f = level0_sorted_file[i];
|
|
FdWithKeyRange& prev = level0_sorted_file[i - 1];
|
|
if (internal_comparator_->Compare(prev.largest_key, f.smallest_key) >= 0) {
|
|
level0_non_overlapping_ = false;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void Version::Ref() {
|
|
++refs_;
|
|
}
|
|
|
|
bool Version::Unref() {
|
|
assert(refs_ >= 1);
|
|
--refs_;
|
|
if (refs_ == 0) {
|
|
delete this;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool VersionStorageInfo::OverlapInLevel(int level,
|
|
const Slice* smallest_user_key,
|
|
const Slice* largest_user_key) {
|
|
if (level >= num_non_empty_levels_) {
|
|
// empty level, no overlap
|
|
return false;
|
|
}
|
|
return SomeFileOverlapsRange(*internal_comparator_, (level > 0),
|
|
level_files_brief_[level], smallest_user_key,
|
|
largest_user_key);
|
|
}
|
|
|
|
// Store in "*inputs" all files in "level" that overlap [begin,end]
|
|
// If hint_index is specified, then it points to a file in the
|
|
// overlapping range.
|
|
// The file_index returns a pointer to any file in an overlapping range.
|
|
void VersionStorageInfo::GetOverlappingInputs(
|
|
int level, const InternalKey* begin, const InternalKey* end,
|
|
std::vector<FileMetaData*>* inputs, int hint_index, int* file_index) {
|
|
if (level >= num_non_empty_levels_) {
|
|
// this level is empty, no overlapping inputs
|
|
return;
|
|
}
|
|
|
|
inputs->clear();
|
|
Slice user_begin, user_end;
|
|
if (begin != nullptr) {
|
|
user_begin = begin->user_key();
|
|
}
|
|
if (end != nullptr) {
|
|
user_end = end->user_key();
|
|
}
|
|
if (file_index) {
|
|
*file_index = -1;
|
|
}
|
|
const Comparator* user_cmp = user_comparator_;
|
|
if (begin != nullptr && end != nullptr && level > 0) {
|
|
GetOverlappingInputsBinarySearch(level, user_begin, user_end, inputs,
|
|
hint_index, file_index);
|
|
return;
|
|
}
|
|
for (size_t i = 0; i < level_files_brief_[level].num_files; ) {
|
|
FdWithKeyRange* f = &(level_files_brief_[level].files[i++]);
|
|
const Slice file_start = ExtractUserKey(f->smallest_key);
|
|
const Slice file_limit = ExtractUserKey(f->largest_key);
|
|
if (begin != nullptr && user_cmp->Compare(file_limit, user_begin) < 0) {
|
|
// "f" is completely before specified range; skip it
|
|
} else if (end != nullptr && user_cmp->Compare(file_start, user_end) > 0) {
|
|
// "f" is completely after specified range; skip it
|
|
} else {
|
|
inputs->push_back(files_[level][i-1]);
|
|
if (level == 0) {
|
|
// Level-0 files may overlap each other. So check if the newly
|
|
// added file has expanded the range. If so, restart search.
|
|
if (begin != nullptr && user_cmp->Compare(file_start, user_begin) < 0) {
|
|
user_begin = file_start;
|
|
inputs->clear();
|
|
i = 0;
|
|
} else if (end != nullptr
|
|
&& user_cmp->Compare(file_limit, user_end) > 0) {
|
|
user_end = file_limit;
|
|
inputs->clear();
|
|
i = 0;
|
|
}
|
|
} else if (file_index) {
|
|
*file_index = static_cast<int>(i) - 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Store in "*inputs" all files in "level" that overlap [begin,end]
|
|
// Employ binary search to find at least one file that overlaps the
|
|
// specified range. From that file, iterate backwards and
|
|
// forwards to find all overlapping files.
|
|
void VersionStorageInfo::GetOverlappingInputsBinarySearch(
|
|
int level, const Slice& user_begin, const Slice& user_end,
|
|
std::vector<FileMetaData*>* inputs, int hint_index, int* file_index) {
|
|
assert(level > 0);
|
|
int min = 0;
|
|
int mid = 0;
|
|
int max = static_cast<int>(files_[level].size()) - 1;
|
|
bool foundOverlap = false;
|
|
const Comparator* user_cmp = user_comparator_;
|
|
|
|
// if the caller already knows the index of a file that has overlap,
|
|
// then we can skip the binary search.
|
|
if (hint_index != -1) {
|
|
mid = hint_index;
|
|
foundOverlap = true;
|
|
}
|
|
|
|
while (!foundOverlap && min <= max) {
|
|
mid = (min + max)/2;
|
|
FdWithKeyRange* f = &(level_files_brief_[level].files[mid]);
|
|
const Slice file_start = ExtractUserKey(f->smallest_key);
|
|
const Slice file_limit = ExtractUserKey(f->largest_key);
|
|
if (user_cmp->Compare(file_limit, user_begin) < 0) {
|
|
min = mid + 1;
|
|
} else if (user_cmp->Compare(user_end, file_start) < 0) {
|
|
max = mid - 1;
|
|
} else {
|
|
foundOverlap = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// If there were no overlapping files, return immediately.
|
|
if (!foundOverlap) {
|
|
return;
|
|
}
|
|
// returns the index where an overlap is found
|
|
if (file_index) {
|
|
*file_index = mid;
|
|
}
|
|
ExtendOverlappingInputs(level, user_begin, user_end, inputs, mid);
|
|
}
|
|
|
|
// Store in "*inputs" all files in "level" that overlap [begin,end]
|
|
// The midIndex specifies the index of at least one file that
|
|
// overlaps the specified range. From that file, iterate backward
|
|
// and forward to find all overlapping files.
|
|
// Use FileLevel in searching, make it faster
|
|
void VersionStorageInfo::ExtendOverlappingInputs(
|
|
int level, const Slice& user_begin, const Slice& user_end,
|
|
std::vector<FileMetaData*>* inputs, unsigned int midIndex) {
|
|
|
|
const Comparator* user_cmp = user_comparator_;
|
|
const FdWithKeyRange* files = level_files_brief_[level].files;
|
|
#ifndef NDEBUG
|
|
{
|
|
// assert that the file at midIndex overlaps with the range
|
|
assert(midIndex < level_files_brief_[level].num_files);
|
|
const FdWithKeyRange* f = &files[midIndex];
|
|
const Slice fstart = ExtractUserKey(f->smallest_key);
|
|
const Slice flimit = ExtractUserKey(f->largest_key);
|
|
if (user_cmp->Compare(fstart, user_begin) >= 0) {
|
|
assert(user_cmp->Compare(fstart, user_end) <= 0);
|
|
} else {
|
|
assert(user_cmp->Compare(flimit, user_begin) >= 0);
|
|
}
|
|
}
|
|
#endif
|
|
int startIndex = midIndex + 1;
|
|
int endIndex = midIndex;
|
|
int count __attribute__((unused)) = 0;
|
|
|
|
// check backwards from 'mid' to lower indices
|
|
for (int i = midIndex; i >= 0 ; i--) {
|
|
const FdWithKeyRange* f = &files[i];
|
|
const Slice file_limit = ExtractUserKey(f->largest_key);
|
|
if (user_cmp->Compare(file_limit, user_begin) >= 0) {
|
|
startIndex = i;
|
|
assert((count++, true));
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
// check forward from 'mid+1' to higher indices
|
|
for (unsigned int i = midIndex+1;
|
|
i < level_files_brief_[level].num_files; i++) {
|
|
const FdWithKeyRange* f = &files[i];
|
|
const Slice file_start = ExtractUserKey(f->smallest_key);
|
|
if (user_cmp->Compare(file_start, user_end) <= 0) {
|
|
assert((count++, true));
|
|
endIndex = i;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
assert(count == endIndex - startIndex + 1);
|
|
|
|
// insert overlapping files into vector
|
|
for (int i = startIndex; i <= endIndex; i++) {
|
|
FileMetaData* f = files_[level][i];
|
|
inputs->push_back(f);
|
|
}
|
|
}
|
|
|
|
// Returns true iff the first or last file in inputs contains
|
|
// an overlapping user key to the file "just outside" of it (i.e.
|
|
// just after the last file, or just before the first file)
|
|
// REQUIRES: "*inputs" is a sorted list of non-overlapping files
|
|
bool VersionStorageInfo::HasOverlappingUserKey(
|
|
const std::vector<FileMetaData*>* inputs, int level) {
|
|
|
|
// If inputs empty, there is no overlap.
|
|
// If level == 0, it is assumed that all needed files were already included.
|
|
if (inputs->empty() || level == 0){
|
|
return false;
|
|
}
|
|
|
|
const Comparator* user_cmp = user_comparator_;
|
|
const rocksdb::LevelFilesBrief& file_level = level_files_brief_[level];
|
|
const FdWithKeyRange* files = level_files_brief_[level].files;
|
|
const size_t kNumFiles = file_level.num_files;
|
|
|
|
// Check the last file in inputs against the file after it
|
|
size_t last_file = FindFile(*internal_comparator_, file_level,
|
|
inputs->back()->largest.Encode());
|
|
assert(last_file < kNumFiles); // File should exist!
|
|
if (last_file < kNumFiles-1) { // If not the last file
|
|
const Slice last_key_in_input = ExtractUserKey(
|
|
files[last_file].largest_key);
|
|
const Slice first_key_after = ExtractUserKey(
|
|
files[last_file+1].smallest_key);
|
|
if (user_cmp->Equal(last_key_in_input, first_key_after)) {
|
|
// The last user key in input overlaps with the next file's first key
|
|
return true;
|
|
}
|
|
}
|
|
|
|
// Check the first file in inputs against the file just before it
|
|
size_t first_file = FindFile(*internal_comparator_, file_level,
|
|
inputs->front()->smallest.Encode());
|
|
assert(first_file <= last_file); // File should exist!
|
|
if (first_file > 0) { // If not first file
|
|
const Slice& first_key_in_input = ExtractUserKey(
|
|
files[first_file].smallest_key);
|
|
const Slice& last_key_before = ExtractUserKey(
|
|
files[first_file-1].largest_key);
|
|
if (user_cmp->Equal(first_key_in_input, last_key_before)) {
|
|
// The first user key in input overlaps with the previous file's last key
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
uint64_t VersionStorageInfo::NumLevelBytes(int level) const {
|
|
assert(level >= 0);
|
|
assert(level < num_levels());
|
|
return TotalFileSize(files_[level]);
|
|
}
|
|
|
|
const char* VersionStorageInfo::LevelSummary(
|
|
LevelSummaryStorage* scratch) const {
|
|
int len = 0;
|
|
if (compaction_style_ == kCompactionStyleLevel && num_levels() > 1) {
|
|
assert(base_level_ < static_cast<int>(level_max_bytes_.size()));
|
|
len = snprintf(scratch->buffer, sizeof(scratch->buffer),
|
|
"base level %d max bytes base %" PRIu64 " ", base_level_,
|
|
level_max_bytes_[base_level_]);
|
|
}
|
|
len +=
|
|
snprintf(scratch->buffer + len, sizeof(scratch->buffer) - len, "files[");
|
|
for (int i = 0; i < num_levels(); i++) {
|
|
int sz = sizeof(scratch->buffer) - len;
|
|
int ret = snprintf(scratch->buffer + len, sz, "%d ", int(files_[i].size()));
|
|
if (ret < 0 || ret >= sz) break;
|
|
len += ret;
|
|
}
|
|
if (len > 0) {
|
|
// overwrite the last space
|
|
--len;
|
|
}
|
|
len += snprintf(scratch->buffer + len, sizeof(scratch->buffer) - len,
|
|
"] max score %.2f", compaction_score_[0]);
|
|
|
|
if (!files_marked_for_compaction_.empty()) {
|
|
snprintf(scratch->buffer + len, sizeof(scratch->buffer) - len,
|
|
" (%" ROCKSDB_PRIszt " files need compaction)",
|
|
files_marked_for_compaction_.size());
|
|
}
|
|
|
|
return scratch->buffer;
|
|
}
|
|
|
|
const char* VersionStorageInfo::LevelFileSummary(FileSummaryStorage* scratch,
|
|
int level) const {
|
|
int len = snprintf(scratch->buffer, sizeof(scratch->buffer), "files_size[");
|
|
for (const auto& f : files_[level]) {
|
|
int sz = sizeof(scratch->buffer) - len;
|
|
char sztxt[16];
|
|
AppendHumanBytes(f->fd.GetFileSize(), sztxt, sizeof(sztxt));
|
|
int ret = snprintf(scratch->buffer + len, sz,
|
|
"#%" PRIu64 "(seq=%" PRIu64 ",sz=%s,%d) ",
|
|
f->fd.GetNumber(), f->smallest_seqno, sztxt,
|
|
static_cast<int>(f->being_compacted));
|
|
if (ret < 0 || ret >= sz)
|
|
break;
|
|
len += ret;
|
|
}
|
|
// overwrite the last space (only if files_[level].size() is non-zero)
|
|
if (files_[level].size() && len > 0) {
|
|
--len;
|
|
}
|
|
snprintf(scratch->buffer + len, sizeof(scratch->buffer) - len, "]");
|
|
return scratch->buffer;
|
|
}
|
|
|
|
int64_t VersionStorageInfo::MaxNextLevelOverlappingBytes() {
|
|
uint64_t result = 0;
|
|
std::vector<FileMetaData*> overlaps;
|
|
for (int level = 1; level < num_levels() - 1; level++) {
|
|
for (const auto& f : files_[level]) {
|
|
GetOverlappingInputs(level + 1, &f->smallest, &f->largest, &overlaps);
|
|
const uint64_t sum = TotalFileSize(overlaps);
|
|
if (sum > result) {
|
|
result = sum;
|
|
}
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
uint64_t VersionStorageInfo::MaxBytesForLevel(int level) const {
|
|
// Note: the result for level zero is not really used since we set
|
|
// the level-0 compaction threshold based on number of files.
|
|
assert(level >= 0);
|
|
assert(level < static_cast<int>(level_max_bytes_.size()));
|
|
return level_max_bytes_[level];
|
|
}
|
|
|
|
void VersionStorageInfo::CalculateBaseBytes(const ImmutableCFOptions& ioptions,
|
|
const MutableCFOptions& options) {
|
|
// Special logic to set number of sorted runs.
|
|
// It is to match the previous behavior when all files are in L0.
|
|
int num_l0_count = static_cast<int>(files_[0].size());
|
|
if (compaction_style_ == kCompactionStyleUniversal) {
|
|
// For universal compaction, we use level0 score to indicate
|
|
// compaction score for the whole DB. Adding other levels as if
|
|
// they are L0 files.
|
|
for (int i = 1; i < num_levels(); i++) {
|
|
if (!files_[i].empty()) {
|
|
num_l0_count++;
|
|
}
|
|
}
|
|
}
|
|
set_l0_delay_trigger_count(num_l0_count);
|
|
|
|
level_max_bytes_.resize(ioptions.num_levels);
|
|
if (!ioptions.level_compaction_dynamic_level_bytes) {
|
|
base_level_ = (ioptions.compaction_style == kCompactionStyleLevel) ? 1 : -1;
|
|
|
|
// Calculate for static bytes base case
|
|
for (int i = 0; i < ioptions.num_levels; ++i) {
|
|
if (i == 0 && ioptions.compaction_style == kCompactionStyleUniversal) {
|
|
level_max_bytes_[i] = options.max_bytes_for_level_base;
|
|
} else if (i > 1) {
|
|
level_max_bytes_[i] = MultiplyCheckOverflow(
|
|
MultiplyCheckOverflow(level_max_bytes_[i - 1],
|
|
options.max_bytes_for_level_multiplier),
|
|
options.MaxBytesMultiplerAdditional(i - 1));
|
|
} else {
|
|
level_max_bytes_[i] = options.max_bytes_for_level_base;
|
|
}
|
|
}
|
|
} else {
|
|
uint64_t max_level_size = 0;
|
|
|
|
int first_non_empty_level = -1;
|
|
// Find size of non-L0 level of most data.
|
|
// Cannot use the size of the last level because it can be empty or less
|
|
// than previous levels after compaction.
|
|
for (int i = 1; i < num_levels_; i++) {
|
|
uint64_t total_size = 0;
|
|
for (const auto& f : files_[i]) {
|
|
total_size += f->fd.GetFileSize();
|
|
}
|
|
if (total_size > 0 && first_non_empty_level == -1) {
|
|
first_non_empty_level = i;
|
|
}
|
|
if (total_size > max_level_size) {
|
|
max_level_size = total_size;
|
|
}
|
|
}
|
|
|
|
// Prefill every level's max bytes to disallow compaction from there.
|
|
for (int i = 0; i < num_levels_; i++) {
|
|
level_max_bytes_[i] = std::numeric_limits<uint64_t>::max();
|
|
}
|
|
|
|
if (max_level_size == 0) {
|
|
// No data for L1 and up. L0 compacts to last level directly.
|
|
// No compaction from L1+ needs to be scheduled.
|
|
base_level_ = num_levels_ - 1;
|
|
} else {
|
|
uint64_t base_bytes_max = options.max_bytes_for_level_base;
|
|
uint64_t base_bytes_min =
|
|
base_bytes_max / options.max_bytes_for_level_multiplier;
|
|
|
|
// Try whether we can make last level's target size to be max_level_size
|
|
uint64_t cur_level_size = max_level_size;
|
|
for (int i = num_levels_ - 2; i >= first_non_empty_level; i--) {
|
|
// Round up after dividing
|
|
cur_level_size /= options.max_bytes_for_level_multiplier;
|
|
}
|
|
|
|
// Calculate base level and its size.
|
|
uint64_t base_level_size;
|
|
if (cur_level_size <= base_bytes_min) {
|
|
// Case 1. If we make target size of last level to be max_level_size,
|
|
// target size of the first non-empty level would be smaller than
|
|
// base_bytes_min. We set it be base_bytes_min.
|
|
base_level_size = base_bytes_min + 1U;
|
|
base_level_ = first_non_empty_level;
|
|
Warn(ioptions.info_log,
|
|
"More existing levels in DB than needed. "
|
|
"max_bytes_for_level_multiplier may not be guaranteed.");
|
|
} else {
|
|
// Find base level (where L0 data is compacted to).
|
|
base_level_ = first_non_empty_level;
|
|
while (base_level_ > 1 && cur_level_size > base_bytes_max) {
|
|
--base_level_;
|
|
cur_level_size =
|
|
cur_level_size / options.max_bytes_for_level_multiplier;
|
|
}
|
|
if (cur_level_size > base_bytes_max) {
|
|
// Even L1 will be too large
|
|
assert(base_level_ == 1);
|
|
base_level_size = base_bytes_max;
|
|
} else {
|
|
base_level_size = cur_level_size;
|
|
}
|
|
}
|
|
|
|
uint64_t level_size = base_level_size;
|
|
for (int i = base_level_; i < num_levels_; i++) {
|
|
if (i > base_level_) {
|
|
level_size = MultiplyCheckOverflow(
|
|
level_size, options.max_bytes_for_level_multiplier);
|
|
}
|
|
level_max_bytes_[i] = level_size;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
uint64_t VersionStorageInfo::EstimateLiveDataSize() const {
|
|
// Estimate the live data size by adding up the size of the last level for all
|
|
// key ranges. Note: Estimate depends on the ordering of files in level 0
|
|
// because files in level 0 can be overlapping.
|
|
uint64_t size = 0;
|
|
|
|
auto ikey_lt = [this](InternalKey* x, InternalKey* y) {
|
|
return internal_comparator_->Compare(*x, *y) < 0;
|
|
};
|
|
// (Ordered) map of largest keys in non-overlapping files
|
|
std::map<InternalKey*, FileMetaData*, decltype(ikey_lt)> ranges(ikey_lt);
|
|
|
|
for (int l = num_levels_ - 1; l >= 0; l--) {
|
|
bool found_end = false;
|
|
for (auto file : files_[l]) {
|
|
// Find the first file where the largest key is larger than the smallest
|
|
// key of the current file. If this file does not overlap with the
|
|
// current file, none of the files in the map does. If there is
|
|
// no potential overlap, we can safely insert the rest of this level
|
|
// (if the level is not 0) into the map without checking again because
|
|
// the elements in the level are sorted and non-overlapping.
|
|
auto lb = (found_end && l != 0) ?
|
|
ranges.end() : ranges.lower_bound(&file->smallest);
|
|
found_end = (lb == ranges.end());
|
|
if (found_end || internal_comparator_->Compare(
|
|
file->largest, (*lb).second->smallest) < 0) {
|
|
ranges.emplace_hint(lb, &file->largest, file);
|
|
size += file->fd.file_size;
|
|
}
|
|
}
|
|
}
|
|
return size;
|
|
}
|
|
|
|
|
|
void Version::AddLiveFiles(std::vector<FileDescriptor>* live) {
|
|
for (int level = 0; level < storage_info_.num_levels(); level++) {
|
|
const std::vector<FileMetaData*>& files = storage_info_.files_[level];
|
|
for (const auto& file : files) {
|
|
live->push_back(file->fd);
|
|
}
|
|
}
|
|
}
|
|
|
|
std::string Version::DebugString(bool hex) const {
|
|
std::string r;
|
|
for (int level = 0; level < storage_info_.num_levels_; level++) {
|
|
// E.g.,
|
|
// --- level 1 ---
|
|
// 17:123['a' .. 'd']
|
|
// 20:43['e' .. 'g']
|
|
r.append("--- level ");
|
|
AppendNumberTo(&r, level);
|
|
r.append(" --- version# ");
|
|
AppendNumberTo(&r, version_number_);
|
|
r.append(" ---\n");
|
|
const std::vector<FileMetaData*>& files = storage_info_.files_[level];
|
|
for (size_t i = 0; i < files.size(); i++) {
|
|
r.push_back(' ');
|
|
AppendNumberTo(&r, files[i]->fd.GetNumber());
|
|
r.push_back(':');
|
|
AppendNumberTo(&r, files[i]->fd.GetFileSize());
|
|
r.append("[");
|
|
r.append(files[i]->smallest.DebugString(hex));
|
|
r.append(" .. ");
|
|
r.append(files[i]->largest.DebugString(hex));
|
|
r.append("]\n");
|
|
}
|
|
}
|
|
return r;
|
|
}
|
|
|
|
// this is used to batch writes to the manifest file
|
|
struct VersionSet::ManifestWriter {
|
|
Status status;
|
|
bool done;
|
|
InstrumentedCondVar cv;
|
|
ColumnFamilyData* cfd;
|
|
VersionEdit* edit;
|
|
|
|
explicit ManifestWriter(InstrumentedMutex* mu, ColumnFamilyData* _cfd,
|
|
VersionEdit* e)
|
|
: done(false), cv(mu), cfd(_cfd), edit(e) {}
|
|
};
|
|
|
|
VersionSet::VersionSet(const std::string& dbname, const DBOptions* db_options,
|
|
const EnvOptions& storage_options, Cache* table_cache,
|
|
WriteBuffer* write_buffer,
|
|
WriteController* write_controller)
|
|
: column_family_set_(new ColumnFamilySet(
|
|
dbname, db_options, storage_options, table_cache,
|
|
write_buffer, write_controller)),
|
|
env_(db_options->env),
|
|
dbname_(dbname),
|
|
db_options_(db_options),
|
|
next_file_number_(2),
|
|
manifest_file_number_(0), // Filled by Recover()
|
|
pending_manifest_file_number_(0),
|
|
last_sequence_(0),
|
|
prev_log_number_(0),
|
|
current_version_number_(0),
|
|
manifest_file_size_(0),
|
|
env_options_(storage_options),
|
|
env_options_compactions_(env_options_) {}
|
|
|
|
VersionSet::~VersionSet() {
|
|
// we need to delete column_family_set_ because its destructor depends on
|
|
// VersionSet
|
|
column_family_set_.reset();
|
|
for (auto file : obsolete_files_) {
|
|
delete file;
|
|
}
|
|
obsolete_files_.clear();
|
|
}
|
|
|
|
void VersionSet::AppendVersion(ColumnFamilyData* column_family_data,
|
|
Version* v) {
|
|
// compute new compaction score
|
|
v->storage_info()->ComputeCompactionScore(
|
|
*column_family_data->GetLatestMutableCFOptions(),
|
|
column_family_data->ioptions()->compaction_options_fifo);
|
|
|
|
// Mark v finalized
|
|
v->storage_info_.SetFinalized();
|
|
|
|
// Make "v" current
|
|
assert(v->refs_ == 0);
|
|
Version* current = column_family_data->current();
|
|
assert(v != current);
|
|
if (current != nullptr) {
|
|
assert(current->refs_ > 0);
|
|
current->Unref();
|
|
}
|
|
column_family_data->SetCurrent(v);
|
|
v->Ref();
|
|
|
|
// Append to linked list
|
|
v->prev_ = column_family_data->dummy_versions()->prev_;
|
|
v->next_ = column_family_data->dummy_versions();
|
|
v->prev_->next_ = v;
|
|
v->next_->prev_ = v;
|
|
}
|
|
|
|
Status VersionSet::LogAndApply(ColumnFamilyData* column_family_data,
|
|
const MutableCFOptions& mutable_cf_options,
|
|
VersionEdit* edit, InstrumentedMutex* mu,
|
|
Directory* db_directory, bool new_descriptor_log,
|
|
const ColumnFamilyOptions* new_cf_options) {
|
|
mu->AssertHeld();
|
|
|
|
// column_family_data can be nullptr only if this is column_family_add.
|
|
// in that case, we also need to specify ColumnFamilyOptions
|
|
if (column_family_data == nullptr) {
|
|
assert(edit->is_column_family_add_);
|
|
assert(new_cf_options != nullptr);
|
|
}
|
|
|
|
// queue our request
|
|
ManifestWriter w(mu, column_family_data, edit);
|
|
manifest_writers_.push_back(&w);
|
|
while (!w.done && &w != manifest_writers_.front()) {
|
|
w.cv.Wait();
|
|
}
|
|
if (w.done) {
|
|
return w.status;
|
|
}
|
|
if (column_family_data != nullptr && column_family_data->IsDropped()) {
|
|
// if column family is dropped by the time we get here, no need to write
|
|
// anything to the manifest
|
|
manifest_writers_.pop_front();
|
|
// Notify new head of write queue
|
|
if (!manifest_writers_.empty()) {
|
|
manifest_writers_.front()->cv.Signal();
|
|
}
|
|
// we steal this code to also inform about cf-drop
|
|
return Status::ShutdownInProgress();
|
|
}
|
|
|
|
std::vector<VersionEdit*> batch_edits;
|
|
Version* v = nullptr;
|
|
std::unique_ptr<BaseReferencedVersionBuilder> builder_guard(nullptr);
|
|
|
|
// process all requests in the queue
|
|
ManifestWriter* last_writer = &w;
|
|
assert(!manifest_writers_.empty());
|
|
assert(manifest_writers_.front() == &w);
|
|
if (edit->IsColumnFamilyManipulation()) {
|
|
// no group commits for column family add or drop
|
|
LogAndApplyCFHelper(edit);
|
|
batch_edits.push_back(edit);
|
|
} else {
|
|
v = new Version(column_family_data, this, current_version_number_++);
|
|
builder_guard.reset(new BaseReferencedVersionBuilder(column_family_data));
|
|
auto* builder = builder_guard->version_builder();
|
|
for (const auto& writer : manifest_writers_) {
|
|
if (writer->edit->IsColumnFamilyManipulation() ||
|
|
writer->cfd->GetID() != column_family_data->GetID()) {
|
|
// no group commits for column family add or drop
|
|
// also, group commits across column families are not supported
|
|
break;
|
|
}
|
|
last_writer = writer;
|
|
LogAndApplyHelper(column_family_data, builder, v, last_writer->edit, mu);
|
|
batch_edits.push_back(last_writer->edit);
|
|
}
|
|
builder->SaveTo(v->storage_info());
|
|
}
|
|
|
|
// Initialize new descriptor log file if necessary by creating
|
|
// a temporary file that contains a snapshot of the current version.
|
|
uint64_t new_manifest_file_size = 0;
|
|
Status s;
|
|
|
|
assert(pending_manifest_file_number_ == 0);
|
|
if (!descriptor_log_ ||
|
|
manifest_file_size_ > db_options_->max_manifest_file_size) {
|
|
pending_manifest_file_number_ = NewFileNumber();
|
|
batch_edits.back()->SetNextFile(next_file_number_.load());
|
|
new_descriptor_log = true;
|
|
} else {
|
|
pending_manifest_file_number_ = manifest_file_number_;
|
|
}
|
|
|
|
if (new_descriptor_log) {
|
|
// if we're writing out new snapshot make sure to persist max column family
|
|
if (column_family_set_->GetMaxColumnFamily() > 0) {
|
|
edit->SetMaxColumnFamily(column_family_set_->GetMaxColumnFamily());
|
|
}
|
|
}
|
|
|
|
// Unlock during expensive operations. New writes cannot get here
|
|
// because &w is ensuring that all new writes get queued.
|
|
{
|
|
|
|
mu->Unlock();
|
|
|
|
TEST_SYNC_POINT("VersionSet::LogAndApply:WriteManifest");
|
|
if (!edit->IsColumnFamilyManipulation() &&
|
|
db_options_->max_open_files == -1) {
|
|
// unlimited table cache. Pre-load table handle now.
|
|
// Need to do it out of the mutex.
|
|
builder_guard->version_builder()->LoadTableHandlers(
|
|
column_family_data->internal_stats());
|
|
}
|
|
|
|
// This is fine because everything inside of this block is serialized --
|
|
// only one thread can be here at the same time
|
|
if (new_descriptor_log) {
|
|
// create manifest file
|
|
Log(InfoLogLevel::INFO_LEVEL, db_options_->info_log,
|
|
"Creating manifest %" PRIu64 "\n", pending_manifest_file_number_);
|
|
unique_ptr<WritableFile> descriptor_file;
|
|
EnvOptions opt_env_opts = env_->OptimizeForManifestWrite(env_options_);
|
|
s = env_->NewWritableFile(
|
|
DescriptorFileName(dbname_, pending_manifest_file_number_),
|
|
&descriptor_file, opt_env_opts);
|
|
if (s.ok()) {
|
|
descriptor_file->SetPreallocationBlockSize(
|
|
db_options_->manifest_preallocation_size);
|
|
|
|
unique_ptr<WritableFileWriter> file_writer(
|
|
new WritableFileWriter(std::move(descriptor_file), opt_env_opts));
|
|
descriptor_log_.reset(new log::Writer(std::move(file_writer)));
|
|
s = WriteSnapshot(descriptor_log_.get());
|
|
}
|
|
}
|
|
|
|
if (!edit->IsColumnFamilyManipulation()) {
|
|
// This is cpu-heavy operations, which should be called outside mutex.
|
|
v->PrepareApply(mutable_cf_options, true);
|
|
}
|
|
|
|
// Write new record to MANIFEST log
|
|
if (s.ok()) {
|
|
for (auto& e : batch_edits) {
|
|
std::string record;
|
|
if (!e->EncodeTo(&record)) {
|
|
s = Status::Corruption(
|
|
"Unable to Encode VersionEdit:" + e->DebugString(true));
|
|
break;
|
|
}
|
|
s = descriptor_log_->AddRecord(record);
|
|
if (!s.ok()) {
|
|
break;
|
|
}
|
|
}
|
|
if (s.ok()) {
|
|
s = SyncManifest(env_, db_options_, descriptor_log_->file());
|
|
}
|
|
if (!s.ok()) {
|
|
Log(InfoLogLevel::ERROR_LEVEL, db_options_->info_log,
|
|
"MANIFEST write: %s\n", s.ToString().c_str());
|
|
bool all_records_in = true;
|
|
for (auto& e : batch_edits) {
|
|
std::string record;
|
|
if (!e->EncodeTo(&record)) {
|
|
s = Status::Corruption(
|
|
"Unable to Encode VersionEdit:" + e->DebugString(true));
|
|
all_records_in = false;
|
|
break;
|
|
}
|
|
if (!ManifestContains(pending_manifest_file_number_, record)) {
|
|
all_records_in = false;
|
|
break;
|
|
}
|
|
}
|
|
if (all_records_in) {
|
|
Log(InfoLogLevel::WARN_LEVEL, db_options_->info_log,
|
|
"MANIFEST contains log record despite error; advancing to new "
|
|
"version to prevent mismatch between in-memory and logged state"
|
|
" If paranoid is set, then the db is now in readonly mode.");
|
|
s = Status::OK();
|
|
}
|
|
}
|
|
}
|
|
|
|
// If we just created a new descriptor file, install it by writing a
|
|
// new CURRENT file that points to it.
|
|
if (s.ok() && new_descriptor_log) {
|
|
s = SetCurrentFile(env_, dbname_, pending_manifest_file_number_,
|
|
db_options_->disableDataSync ? nullptr : db_directory);
|
|
if (s.ok() && pending_manifest_file_number_ > manifest_file_number_) {
|
|
// delete old manifest file
|
|
Log(InfoLogLevel::INFO_LEVEL, db_options_->info_log,
|
|
"Deleting manifest %" PRIu64 " current manifest %" PRIu64 "\n",
|
|
manifest_file_number_, pending_manifest_file_number_);
|
|
// we don't care about an error here, PurgeObsoleteFiles will take care
|
|
// of it later
|
|
env_->DeleteFile(DescriptorFileName(dbname_, manifest_file_number_));
|
|
}
|
|
}
|
|
|
|
if (s.ok()) {
|
|
// find offset in manifest file where this version is stored.
|
|
new_manifest_file_size = descriptor_log_->file()->GetFileSize();
|
|
}
|
|
|
|
if (edit->is_column_family_drop_) {
|
|
TEST_SYNC_POINT("VersionSet::LogAndApply::ColumnFamilyDrop:1");
|
|
TEST_SYNC_POINT("VersionSet::LogAndApply::ColumnFamilyDrop:2");
|
|
}
|
|
|
|
LogFlush(db_options_->info_log);
|
|
mu->Lock();
|
|
}
|
|
|
|
// Install the new version
|
|
if (s.ok()) {
|
|
if (edit->is_column_family_add_) {
|
|
// no group commit on column family add
|
|
assert(batch_edits.size() == 1);
|
|
assert(new_cf_options != nullptr);
|
|
CreateColumnFamily(*new_cf_options, edit);
|
|
} else if (edit->is_column_family_drop_) {
|
|
assert(batch_edits.size() == 1);
|
|
column_family_data->SetDropped();
|
|
if (column_family_data->Unref()) {
|
|
delete column_family_data;
|
|
}
|
|
} else {
|
|
uint64_t max_log_number_in_batch = 0;
|
|
for (auto& e : batch_edits) {
|
|
if (e->has_log_number_) {
|
|
max_log_number_in_batch =
|
|
std::max(max_log_number_in_batch, e->log_number_);
|
|
}
|
|
}
|
|
if (max_log_number_in_batch != 0) {
|
|
assert(column_family_data->GetLogNumber() <= max_log_number_in_batch);
|
|
column_family_data->SetLogNumber(max_log_number_in_batch);
|
|
}
|
|
AppendVersion(column_family_data, v);
|
|
}
|
|
|
|
manifest_file_number_ = pending_manifest_file_number_;
|
|
manifest_file_size_ = new_manifest_file_size;
|
|
prev_log_number_ = edit->prev_log_number_;
|
|
} else {
|
|
Log(InfoLogLevel::ERROR_LEVEL, db_options_->info_log,
|
|
"Error in committing version %lu to [%s]",
|
|
(unsigned long)v->GetVersionNumber(),
|
|
column_family_data->GetName().c_str());
|
|
delete v;
|
|
if (new_descriptor_log) {
|
|
Log(InfoLogLevel::INFO_LEVEL, db_options_->info_log,
|
|
"Deleting manifest %" PRIu64 " current manifest %" PRIu64 "\n",
|
|
manifest_file_number_, pending_manifest_file_number_);
|
|
descriptor_log_.reset();
|
|
env_->DeleteFile(
|
|
DescriptorFileName(dbname_, pending_manifest_file_number_));
|
|
}
|
|
}
|
|
pending_manifest_file_number_ = 0;
|
|
|
|
// wake up all the waiting writers
|
|
while (true) {
|
|
ManifestWriter* ready = manifest_writers_.front();
|
|
manifest_writers_.pop_front();
|
|
if (ready != &w) {
|
|
ready->status = s;
|
|
ready->done = true;
|
|
ready->cv.Signal();
|
|
}
|
|
if (ready == last_writer) break;
|
|
}
|
|
// Notify new head of write queue
|
|
if (!manifest_writers_.empty()) {
|
|
manifest_writers_.front()->cv.Signal();
|
|
}
|
|
return s;
|
|
}
|
|
|
|
void VersionSet::LogAndApplyCFHelper(VersionEdit* edit) {
|
|
assert(edit->IsColumnFamilyManipulation());
|
|
edit->SetNextFile(next_file_number_.load());
|
|
edit->SetLastSequence(last_sequence_);
|
|
if (edit->is_column_family_drop_) {
|
|
// if we drop column family, we have to make sure to save max column family,
|
|
// so that we don't reuse existing ID
|
|
edit->SetMaxColumnFamily(column_family_set_->GetMaxColumnFamily());
|
|
}
|
|
}
|
|
|
|
void VersionSet::LogAndApplyHelper(ColumnFamilyData* cfd,
|
|
VersionBuilder* builder, Version* v,
|
|
VersionEdit* edit, InstrumentedMutex* mu) {
|
|
mu->AssertHeld();
|
|
assert(!edit->IsColumnFamilyManipulation());
|
|
|
|
if (edit->has_log_number_) {
|
|
assert(edit->log_number_ >= cfd->GetLogNumber());
|
|
assert(edit->log_number_ < next_file_number_.load());
|
|
}
|
|
|
|
if (!edit->has_prev_log_number_) {
|
|
edit->SetPrevLogNumber(prev_log_number_);
|
|
}
|
|
edit->SetNextFile(next_file_number_.load());
|
|
edit->SetLastSequence(last_sequence_);
|
|
|
|
builder->Apply(edit);
|
|
}
|
|
|
|
Status VersionSet::Recover(
|
|
const std::vector<ColumnFamilyDescriptor>& column_families,
|
|
bool read_only) {
|
|
std::unordered_map<std::string, ColumnFamilyOptions> cf_name_to_options;
|
|
for (auto cf : column_families) {
|
|
cf_name_to_options.insert({cf.name, cf.options});
|
|
}
|
|
// keeps track of column families in manifest that were not found in
|
|
// column families parameters. if those column families are not dropped
|
|
// by subsequent manifest records, Recover() will return failure status
|
|
std::unordered_map<int, std::string> column_families_not_found;
|
|
|
|
// Read "CURRENT" file, which contains a pointer to the current manifest file
|
|
std::string manifest_filename;
|
|
Status s = ReadFileToString(
|
|
env_, CurrentFileName(dbname_), &manifest_filename
|
|
);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
if (manifest_filename.empty() ||
|
|
manifest_filename.back() != '\n') {
|
|
return Status::Corruption("CURRENT file does not end with newline");
|
|
}
|
|
// remove the trailing '\n'
|
|
manifest_filename.resize(manifest_filename.size() - 1);
|
|
FileType type;
|
|
bool parse_ok =
|
|
ParseFileName(manifest_filename, &manifest_file_number_, &type);
|
|
if (!parse_ok || type != kDescriptorFile) {
|
|
return Status::Corruption("CURRENT file corrupted");
|
|
}
|
|
|
|
Log(InfoLogLevel::INFO_LEVEL, db_options_->info_log,
|
|
"Recovering from manifest file: %s\n",
|
|
manifest_filename.c_str());
|
|
|
|
manifest_filename = dbname_ + "/" + manifest_filename;
|
|
unique_ptr<SequentialFileReader> manifest_file_reader;
|
|
{
|
|
unique_ptr<SequentialFile> manifest_file;
|
|
s = env_->NewSequentialFile(manifest_filename, &manifest_file,
|
|
env_options_);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
manifest_file_reader.reset(
|
|
new SequentialFileReader(std::move(manifest_file)));
|
|
}
|
|
uint64_t current_manifest_file_size;
|
|
s = env_->GetFileSize(manifest_filename, ¤t_manifest_file_size);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
bool have_log_number = false;
|
|
bool have_prev_log_number = false;
|
|
bool have_next_file = false;
|
|
bool have_last_sequence = false;
|
|
uint64_t next_file = 0;
|
|
uint64_t last_sequence = 0;
|
|
uint64_t log_number = 0;
|
|
uint64_t previous_log_number = 0;
|
|
uint32_t max_column_family = 0;
|
|
std::unordered_map<uint32_t, BaseReferencedVersionBuilder*> builders;
|
|
|
|
// add default column family
|
|
auto default_cf_iter = cf_name_to_options.find(kDefaultColumnFamilyName);
|
|
if (default_cf_iter == cf_name_to_options.end()) {
|
|
return Status::InvalidArgument("Default column family not specified");
|
|
}
|
|
VersionEdit default_cf_edit;
|
|
default_cf_edit.AddColumnFamily(kDefaultColumnFamilyName);
|
|
default_cf_edit.SetColumnFamily(0);
|
|
ColumnFamilyData* default_cfd =
|
|
CreateColumnFamily(default_cf_iter->second, &default_cf_edit);
|
|
builders.insert({0, new BaseReferencedVersionBuilder(default_cfd)});
|
|
|
|
{
|
|
VersionSet::LogReporter reporter;
|
|
reporter.status = &s;
|
|
log::Reader reader(std::move(manifest_file_reader), &reporter,
|
|
true /*checksum*/, 0 /*initial_offset*/);
|
|
Slice record;
|
|
std::string scratch;
|
|
while (reader.ReadRecord(&record, &scratch) && s.ok()) {
|
|
VersionEdit edit;
|
|
s = edit.DecodeFrom(record);
|
|
if (!s.ok()) {
|
|
break;
|
|
}
|
|
|
|
// Not found means that user didn't supply that column
|
|
// family option AND we encountered column family add
|
|
// record. Once we encounter column family drop record,
|
|
// we will delete the column family from
|
|
// column_families_not_found.
|
|
bool cf_in_not_found =
|
|
column_families_not_found.find(edit.column_family_) !=
|
|
column_families_not_found.end();
|
|
// in builders means that user supplied that column family
|
|
// option AND that we encountered column family add record
|
|
bool cf_in_builders =
|
|
builders.find(edit.column_family_) != builders.end();
|
|
|
|
// they can't both be true
|
|
assert(!(cf_in_not_found && cf_in_builders));
|
|
|
|
ColumnFamilyData* cfd = nullptr;
|
|
|
|
if (edit.is_column_family_add_) {
|
|
if (cf_in_builders || cf_in_not_found) {
|
|
s = Status::Corruption(
|
|
"Manifest adding the same column family twice");
|
|
break;
|
|
}
|
|
auto cf_options = cf_name_to_options.find(edit.column_family_name_);
|
|
if (cf_options == cf_name_to_options.end()) {
|
|
column_families_not_found.insert(
|
|
{edit.column_family_, edit.column_family_name_});
|
|
} else {
|
|
cfd = CreateColumnFamily(cf_options->second, &edit);
|
|
builders.insert(
|
|
{edit.column_family_, new BaseReferencedVersionBuilder(cfd)});
|
|
}
|
|
} else if (edit.is_column_family_drop_) {
|
|
if (cf_in_builders) {
|
|
auto builder = builders.find(edit.column_family_);
|
|
assert(builder != builders.end());
|
|
delete builder->second;
|
|
builders.erase(builder);
|
|
cfd = column_family_set_->GetColumnFamily(edit.column_family_);
|
|
if (cfd->Unref()) {
|
|
delete cfd;
|
|
cfd = nullptr;
|
|
} else {
|
|
// who else can have reference to cfd!?
|
|
assert(false);
|
|
}
|
|
} else if (cf_in_not_found) {
|
|
column_families_not_found.erase(edit.column_family_);
|
|
} else {
|
|
s = Status::Corruption(
|
|
"Manifest - dropping non-existing column family");
|
|
break;
|
|
}
|
|
} else if (!cf_in_not_found) {
|
|
if (!cf_in_builders) {
|
|
s = Status::Corruption(
|
|
"Manifest record referencing unknown column family");
|
|
break;
|
|
}
|
|
|
|
cfd = column_family_set_->GetColumnFamily(edit.column_family_);
|
|
// this should never happen since cf_in_builders is true
|
|
assert(cfd != nullptr);
|
|
if (edit.max_level_ >= cfd->current()->storage_info()->num_levels()) {
|
|
s = Status::InvalidArgument(
|
|
"db has more levels than options.num_levels");
|
|
break;
|
|
}
|
|
|
|
// if it is not column family add or column family drop,
|
|
// then it's a file add/delete, which should be forwarded
|
|
// to builder
|
|
auto builder = builders.find(edit.column_family_);
|
|
assert(builder != builders.end());
|
|
builder->second->version_builder()->Apply(&edit);
|
|
}
|
|
|
|
if (cfd != nullptr) {
|
|
if (edit.has_log_number_) {
|
|
if (cfd->GetLogNumber() > edit.log_number_) {
|
|
Log(InfoLogLevel::WARN_LEVEL, db_options_->info_log,
|
|
"MANIFEST corruption detected, but ignored - Log numbers in "
|
|
"records NOT monotonically increasing");
|
|
} else {
|
|
cfd->SetLogNumber(edit.log_number_);
|
|
have_log_number = true;
|
|
}
|
|
}
|
|
if (edit.has_comparator_ &&
|
|
edit.comparator_ != cfd->user_comparator()->Name()) {
|
|
s = Status::InvalidArgument(
|
|
cfd->user_comparator()->Name(),
|
|
"does not match existing comparator " + edit.comparator_);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (edit.has_prev_log_number_) {
|
|
previous_log_number = edit.prev_log_number_;
|
|
have_prev_log_number = true;
|
|
}
|
|
|
|
if (edit.has_next_file_number_) {
|
|
next_file = edit.next_file_number_;
|
|
have_next_file = true;
|
|
}
|
|
|
|
if (edit.has_max_column_family_) {
|
|
max_column_family = edit.max_column_family_;
|
|
}
|
|
|
|
if (edit.has_last_sequence_) {
|
|
last_sequence = edit.last_sequence_;
|
|
have_last_sequence = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (s.ok()) {
|
|
if (!have_next_file) {
|
|
s = Status::Corruption("no meta-nextfile entry in descriptor");
|
|
} else if (!have_log_number) {
|
|
s = Status::Corruption("no meta-lognumber entry in descriptor");
|
|
} else if (!have_last_sequence) {
|
|
s = Status::Corruption("no last-sequence-number entry in descriptor");
|
|
}
|
|
|
|
if (!have_prev_log_number) {
|
|
previous_log_number = 0;
|
|
}
|
|
|
|
column_family_set_->UpdateMaxColumnFamily(max_column_family);
|
|
|
|
MarkFileNumberUsedDuringRecovery(previous_log_number);
|
|
MarkFileNumberUsedDuringRecovery(log_number);
|
|
}
|
|
|
|
// there were some column families in the MANIFEST that weren't specified
|
|
// in the argument. This is OK in read_only mode
|
|
if (read_only == false && !column_families_not_found.empty()) {
|
|
std::string list_of_not_found;
|
|
for (const auto& cf : column_families_not_found) {
|
|
list_of_not_found += ", " + cf.second;
|
|
}
|
|
list_of_not_found = list_of_not_found.substr(2);
|
|
s = Status::InvalidArgument(
|
|
"You have to open all column families. Column families not opened: " +
|
|
list_of_not_found);
|
|
}
|
|
|
|
if (s.ok()) {
|
|
for (auto cfd : *column_family_set_) {
|
|
if (cfd->IsDropped()) {
|
|
continue;
|
|
}
|
|
auto builders_iter = builders.find(cfd->GetID());
|
|
assert(builders_iter != builders.end());
|
|
auto* builder = builders_iter->second->version_builder();
|
|
|
|
if (db_options_->max_open_files == -1) {
|
|
// unlimited table cache. Pre-load table handle now.
|
|
// Need to do it out of the mutex.
|
|
builder->LoadTableHandlers(cfd->internal_stats(),
|
|
db_options_->max_file_opening_threads);
|
|
}
|
|
|
|
Version* v = new Version(cfd, this, current_version_number_++);
|
|
builder->SaveTo(v->storage_info());
|
|
|
|
// Install recovered version
|
|
v->PrepareApply(*cfd->GetLatestMutableCFOptions(),
|
|
!(db_options_->skip_stats_update_on_db_open));
|
|
AppendVersion(cfd, v);
|
|
}
|
|
|
|
manifest_file_size_ = current_manifest_file_size;
|
|
next_file_number_.store(next_file + 1);
|
|
last_sequence_ = last_sequence;
|
|
prev_log_number_ = previous_log_number;
|
|
|
|
Log(InfoLogLevel::INFO_LEVEL, db_options_->info_log,
|
|
"Recovered from manifest file:%s succeeded,"
|
|
"manifest_file_number is %lu, next_file_number is %lu, "
|
|
"last_sequence is %lu, log_number is %lu,"
|
|
"prev_log_number is %lu,"
|
|
"max_column_family is %u\n",
|
|
manifest_filename.c_str(), (unsigned long)manifest_file_number_,
|
|
(unsigned long)next_file_number_.load(), (unsigned long)last_sequence_,
|
|
(unsigned long)log_number, (unsigned long)prev_log_number_,
|
|
column_family_set_->GetMaxColumnFamily());
|
|
|
|
for (auto cfd : *column_family_set_) {
|
|
if (cfd->IsDropped()) {
|
|
continue;
|
|
}
|
|
Log(InfoLogLevel::INFO_LEVEL, db_options_->info_log,
|
|
"Column family [%s] (ID %u), log number is %" PRIu64 "\n",
|
|
cfd->GetName().c_str(), cfd->GetID(), cfd->GetLogNumber());
|
|
}
|
|
}
|
|
|
|
for (auto builder : builders) {
|
|
delete builder.second;
|
|
}
|
|
|
|
return s;
|
|
}
|
|
|
|
Status VersionSet::ListColumnFamilies(std::vector<std::string>* column_families,
|
|
const std::string& dbname, Env* env) {
|
|
// these are just for performance reasons, not correcntes,
|
|
// so we're fine using the defaults
|
|
EnvOptions soptions;
|
|
// Read "CURRENT" file, which contains a pointer to the current manifest file
|
|
std::string current;
|
|
Status s = ReadFileToString(env, CurrentFileName(dbname), ¤t);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
if (current.empty() || current[current.size()-1] != '\n') {
|
|
return Status::Corruption("CURRENT file does not end with newline");
|
|
}
|
|
current.resize(current.size() - 1);
|
|
|
|
std::string dscname = dbname + "/" + current;
|
|
|
|
unique_ptr<SequentialFileReader> file_reader;
|
|
{
|
|
unique_ptr<SequentialFile> file;
|
|
s = env->NewSequentialFile(dscname, &file, soptions);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
file_reader.reset(new SequentialFileReader(std::move(file)));
|
|
}
|
|
|
|
std::map<uint32_t, std::string> column_family_names;
|
|
// default column family is always implicitly there
|
|
column_family_names.insert({0, kDefaultColumnFamilyName});
|
|
VersionSet::LogReporter reporter;
|
|
reporter.status = &s;
|
|
log::Reader reader(std::move(file_reader), &reporter, true /*checksum*/,
|
|
0 /*initial_offset*/);
|
|
Slice record;
|
|
std::string scratch;
|
|
while (reader.ReadRecord(&record, &scratch) && s.ok()) {
|
|
VersionEdit edit;
|
|
s = edit.DecodeFrom(record);
|
|
if (!s.ok()) {
|
|
break;
|
|
}
|
|
if (edit.is_column_family_add_) {
|
|
if (column_family_names.find(edit.column_family_) !=
|
|
column_family_names.end()) {
|
|
s = Status::Corruption("Manifest adding the same column family twice");
|
|
break;
|
|
}
|
|
column_family_names.insert(
|
|
{edit.column_family_, edit.column_family_name_});
|
|
} else if (edit.is_column_family_drop_) {
|
|
if (column_family_names.find(edit.column_family_) ==
|
|
column_family_names.end()) {
|
|
s = Status::Corruption(
|
|
"Manifest - dropping non-existing column family");
|
|
break;
|
|
}
|
|
column_family_names.erase(edit.column_family_);
|
|
}
|
|
}
|
|
|
|
column_families->clear();
|
|
if (s.ok()) {
|
|
for (const auto& iter : column_family_names) {
|
|
column_families->push_back(iter.second);
|
|
}
|
|
}
|
|
|
|
return s;
|
|
}
|
|
|
|
#ifndef ROCKSDB_LITE
|
|
Status VersionSet::ReduceNumberOfLevels(const std::string& dbname,
|
|
const Options* options,
|
|
const EnvOptions& env_options,
|
|
int new_levels) {
|
|
if (new_levels <= 1) {
|
|
return Status::InvalidArgument(
|
|
"Number of levels needs to be bigger than 1");
|
|
}
|
|
|
|
ColumnFamilyOptions cf_options(*options);
|
|
std::shared_ptr<Cache> tc(NewLRUCache(options->max_open_files - 10,
|
|
options->table_cache_numshardbits));
|
|
WriteController wc(options->delayed_write_rate);
|
|
WriteBuffer wb(options->db_write_buffer_size);
|
|
VersionSet versions(dbname, options, env_options, tc.get(), &wb, &wc);
|
|
Status status;
|
|
|
|
std::vector<ColumnFamilyDescriptor> dummy;
|
|
ColumnFamilyDescriptor dummy_descriptor(kDefaultColumnFamilyName,
|
|
ColumnFamilyOptions(*options));
|
|
dummy.push_back(dummy_descriptor);
|
|
status = versions.Recover(dummy);
|
|
if (!status.ok()) {
|
|
return status;
|
|
}
|
|
|
|
Version* current_version =
|
|
versions.GetColumnFamilySet()->GetDefault()->current();
|
|
auto* vstorage = current_version->storage_info();
|
|
int current_levels = vstorage->num_levels();
|
|
|
|
if (current_levels <= new_levels) {
|
|
return Status::OK();
|
|
}
|
|
|
|
// Make sure there are file only on one level from
|
|
// (new_levels-1) to (current_levels-1)
|
|
int first_nonempty_level = -1;
|
|
int first_nonempty_level_filenum = 0;
|
|
for (int i = new_levels - 1; i < current_levels; i++) {
|
|
int file_num = vstorage->NumLevelFiles(i);
|
|
if (file_num != 0) {
|
|
if (first_nonempty_level < 0) {
|
|
first_nonempty_level = i;
|
|
first_nonempty_level_filenum = file_num;
|
|
} else {
|
|
char msg[255];
|
|
snprintf(msg, sizeof(msg),
|
|
"Found at least two levels containing files: "
|
|
"[%d:%d],[%d:%d].\n",
|
|
first_nonempty_level, first_nonempty_level_filenum, i,
|
|
file_num);
|
|
return Status::InvalidArgument(msg);
|
|
}
|
|
}
|
|
}
|
|
|
|
// we need to allocate an array with the old number of levels size to
|
|
// avoid SIGSEGV in WriteSnapshot()
|
|
// however, all levels bigger or equal to new_levels will be empty
|
|
std::vector<FileMetaData*>* new_files_list =
|
|
new std::vector<FileMetaData*>[current_levels];
|
|
for (int i = 0; i < new_levels - 1; i++) {
|
|
new_files_list[i] = vstorage->LevelFiles(i);
|
|
}
|
|
|
|
if (first_nonempty_level > 0) {
|
|
new_files_list[new_levels - 1] = vstorage->LevelFiles(first_nonempty_level);
|
|
}
|
|
|
|
delete[] vstorage -> files_;
|
|
vstorage->files_ = new_files_list;
|
|
vstorage->num_levels_ = new_levels;
|
|
|
|
MutableCFOptions mutable_cf_options(*options, ImmutableCFOptions(*options));
|
|
VersionEdit ve;
|
|
InstrumentedMutex dummy_mutex;
|
|
InstrumentedMutexLock l(&dummy_mutex);
|
|
return versions.LogAndApply(
|
|
versions.GetColumnFamilySet()->GetDefault(),
|
|
mutable_cf_options, &ve, &dummy_mutex, nullptr, true);
|
|
}
|
|
|
|
Status VersionSet::DumpManifest(Options& options, std::string& dscname,
|
|
bool verbose, bool hex, bool json) {
|
|
// Open the specified manifest file.
|
|
unique_ptr<SequentialFileReader> file_reader;
|
|
Status s;
|
|
{
|
|
unique_ptr<SequentialFile> file;
|
|
s = options.env->NewSequentialFile(dscname, &file, env_options_);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
file_reader.reset(new SequentialFileReader(std::move(file)));
|
|
}
|
|
|
|
bool have_prev_log_number = false;
|
|
bool have_next_file = false;
|
|
bool have_last_sequence = false;
|
|
uint64_t next_file = 0;
|
|
uint64_t last_sequence = 0;
|
|
uint64_t previous_log_number = 0;
|
|
int count = 0;
|
|
std::unordered_map<uint32_t, std::string> comparators;
|
|
std::unordered_map<uint32_t, BaseReferencedVersionBuilder*> builders;
|
|
|
|
// add default column family
|
|
VersionEdit default_cf_edit;
|
|
default_cf_edit.AddColumnFamily(kDefaultColumnFamilyName);
|
|
default_cf_edit.SetColumnFamily(0);
|
|
ColumnFamilyData* default_cfd =
|
|
CreateColumnFamily(ColumnFamilyOptions(options), &default_cf_edit);
|
|
builders.insert({0, new BaseReferencedVersionBuilder(default_cfd)});
|
|
|
|
{
|
|
VersionSet::LogReporter reporter;
|
|
reporter.status = &s;
|
|
log::Reader reader(std::move(file_reader), &reporter, true /*checksum*/,
|
|
0 /*initial_offset*/);
|
|
Slice record;
|
|
std::string scratch;
|
|
while (reader.ReadRecord(&record, &scratch) && s.ok()) {
|
|
VersionEdit edit;
|
|
s = edit.DecodeFrom(record);
|
|
if (!s.ok()) {
|
|
break;
|
|
}
|
|
|
|
// Write out each individual edit
|
|
if (verbose && !json) {
|
|
printf("%s\n", edit.DebugString(hex).c_str());
|
|
} else if (json) {
|
|
printf("%s\n", edit.DebugJSON(count, hex).c_str());
|
|
}
|
|
count++;
|
|
|
|
bool cf_in_builders =
|
|
builders.find(edit.column_family_) != builders.end();
|
|
|
|
if (edit.has_comparator_) {
|
|
comparators.insert({edit.column_family_, edit.comparator_});
|
|
}
|
|
|
|
ColumnFamilyData* cfd = nullptr;
|
|
|
|
if (edit.is_column_family_add_) {
|
|
if (cf_in_builders) {
|
|
s = Status::Corruption(
|
|
"Manifest adding the same column family twice");
|
|
break;
|
|
}
|
|
cfd = CreateColumnFamily(ColumnFamilyOptions(options), &edit);
|
|
builders.insert(
|
|
{edit.column_family_, new BaseReferencedVersionBuilder(cfd)});
|
|
} else if (edit.is_column_family_drop_) {
|
|
if (!cf_in_builders) {
|
|
s = Status::Corruption(
|
|
"Manifest - dropping non-existing column family");
|
|
break;
|
|
}
|
|
auto builder_iter = builders.find(edit.column_family_);
|
|
delete builder_iter->second;
|
|
builders.erase(builder_iter);
|
|
comparators.erase(edit.column_family_);
|
|
cfd = column_family_set_->GetColumnFamily(edit.column_family_);
|
|
assert(cfd != nullptr);
|
|
cfd->Unref();
|
|
delete cfd;
|
|
cfd = nullptr;
|
|
} else {
|
|
if (!cf_in_builders) {
|
|
s = Status::Corruption(
|
|
"Manifest record referencing unknown column family");
|
|
break;
|
|
}
|
|
|
|
cfd = column_family_set_->GetColumnFamily(edit.column_family_);
|
|
// this should never happen since cf_in_builders is true
|
|
assert(cfd != nullptr);
|
|
|
|
// if it is not column family add or column family drop,
|
|
// then it's a file add/delete, which should be forwarded
|
|
// to builder
|
|
auto builder = builders.find(edit.column_family_);
|
|
assert(builder != builders.end());
|
|
builder->second->version_builder()->Apply(&edit);
|
|
}
|
|
|
|
if (cfd != nullptr && edit.has_log_number_) {
|
|
cfd->SetLogNumber(edit.log_number_);
|
|
}
|
|
|
|
if (edit.has_prev_log_number_) {
|
|
previous_log_number = edit.prev_log_number_;
|
|
have_prev_log_number = true;
|
|
}
|
|
|
|
if (edit.has_next_file_number_) {
|
|
next_file = edit.next_file_number_;
|
|
have_next_file = true;
|
|
}
|
|
|
|
if (edit.has_last_sequence_) {
|
|
last_sequence = edit.last_sequence_;
|
|
have_last_sequence = true;
|
|
}
|
|
|
|
if (edit.has_max_column_family_) {
|
|
column_family_set_->UpdateMaxColumnFamily(edit.max_column_family_);
|
|
}
|
|
}
|
|
}
|
|
file_reader.reset();
|
|
|
|
if (s.ok()) {
|
|
if (!have_next_file) {
|
|
s = Status::Corruption("no meta-nextfile entry in descriptor");
|
|
printf("no meta-nextfile entry in descriptor");
|
|
} else if (!have_last_sequence) {
|
|
printf("no last-sequence-number entry in descriptor");
|
|
s = Status::Corruption("no last-sequence-number entry in descriptor");
|
|
}
|
|
|
|
if (!have_prev_log_number) {
|
|
previous_log_number = 0;
|
|
}
|
|
}
|
|
|
|
if (s.ok()) {
|
|
for (auto cfd : *column_family_set_) {
|
|
if (cfd->IsDropped()) {
|
|
continue;
|
|
}
|
|
auto builders_iter = builders.find(cfd->GetID());
|
|
assert(builders_iter != builders.end());
|
|
auto builder = builders_iter->second->version_builder();
|
|
|
|
Version* v = new Version(cfd, this, current_version_number_++);
|
|
builder->SaveTo(v->storage_info());
|
|
v->PrepareApply(*cfd->GetLatestMutableCFOptions(), false);
|
|
|
|
printf("--------------- Column family \"%s\" (ID %u) --------------\n",
|
|
cfd->GetName().c_str(), (unsigned int)cfd->GetID());
|
|
printf("log number: %lu\n", (unsigned long)cfd->GetLogNumber());
|
|
auto comparator = comparators.find(cfd->GetID());
|
|
if (comparator != comparators.end()) {
|
|
printf("comparator: %s\n", comparator->second.c_str());
|
|
} else {
|
|
printf("comparator: <NO COMPARATOR>\n");
|
|
}
|
|
printf("%s \n", v->DebugString(hex).c_str());
|
|
delete v;
|
|
}
|
|
|
|
// Free builders
|
|
for (auto& builder : builders) {
|
|
delete builder.second;
|
|
}
|
|
|
|
next_file_number_.store(next_file + 1);
|
|
last_sequence_ = last_sequence;
|
|
prev_log_number_ = previous_log_number;
|
|
|
|
printf(
|
|
"next_file_number %lu last_sequence "
|
|
"%lu prev_log_number %lu max_column_family %u\n",
|
|
(unsigned long)next_file_number_.load(), (unsigned long)last_sequence,
|
|
(unsigned long)previous_log_number,
|
|
column_family_set_->GetMaxColumnFamily());
|
|
}
|
|
|
|
return s;
|
|
}
|
|
#endif // ROCKSDB_LITE
|
|
|
|
void VersionSet::MarkFileNumberUsedDuringRecovery(uint64_t number) {
|
|
// only called during recovery which is single threaded, so this works because
|
|
// there can't be concurrent calls
|
|
if (next_file_number_.load(std::memory_order_relaxed) <= number) {
|
|
next_file_number_.store(number + 1, std::memory_order_relaxed);
|
|
}
|
|
}
|
|
|
|
Status VersionSet::WriteSnapshot(log::Writer* log) {
|
|
// TODO: Break up into multiple records to reduce memory usage on recovery?
|
|
|
|
// WARNING: This method doesn't hold a mutex!!
|
|
|
|
// This is done without DB mutex lock held, but only within single-threaded
|
|
// LogAndApply. Column family manipulations can only happen within LogAndApply
|
|
// (the same single thread), so we're safe to iterate.
|
|
for (auto cfd : *column_family_set_) {
|
|
if (cfd->IsDropped()) {
|
|
continue;
|
|
}
|
|
{
|
|
// Store column family info
|
|
VersionEdit edit;
|
|
if (cfd->GetID() != 0) {
|
|
// default column family is always there,
|
|
// no need to explicitly write it
|
|
edit.AddColumnFamily(cfd->GetName());
|
|
edit.SetColumnFamily(cfd->GetID());
|
|
}
|
|
edit.SetComparatorName(
|
|
cfd->internal_comparator().user_comparator()->Name());
|
|
std::string record;
|
|
if (!edit.EncodeTo(&record)) {
|
|
return Status::Corruption(
|
|
"Unable to Encode VersionEdit:" + edit.DebugString(true));
|
|
}
|
|
Status s = log->AddRecord(record);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
}
|
|
|
|
{
|
|
// Save files
|
|
VersionEdit edit;
|
|
edit.SetColumnFamily(cfd->GetID());
|
|
|
|
for (int level = 0; level < cfd->NumberLevels(); level++) {
|
|
for (const auto& f :
|
|
cfd->current()->storage_info()->LevelFiles(level)) {
|
|
edit.AddFile(level, f->fd.GetNumber(), f->fd.GetPathId(),
|
|
f->fd.GetFileSize(), f->smallest, f->largest,
|
|
f->smallest_seqno, f->largest_seqno,
|
|
f->marked_for_compaction);
|
|
}
|
|
}
|
|
edit.SetLogNumber(cfd->GetLogNumber());
|
|
std::string record;
|
|
if (!edit.EncodeTo(&record)) {
|
|
return Status::Corruption(
|
|
"Unable to Encode VersionEdit:" + edit.DebugString(true));
|
|
}
|
|
Status s = log->AddRecord(record);
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
}
|
|
}
|
|
|
|
return Status::OK();
|
|
}
|
|
|
|
// Opens the mainfest file and reads all records
|
|
// till it finds the record we are looking for.
|
|
bool VersionSet::ManifestContains(uint64_t manifest_file_num,
|
|
const std::string& record) const {
|
|
std::string fname = DescriptorFileName(dbname_, manifest_file_num);
|
|
Log(InfoLogLevel::INFO_LEVEL, db_options_->info_log,
|
|
"ManifestContains: checking %s\n", fname.c_str());
|
|
|
|
unique_ptr<SequentialFileReader> file_reader;
|
|
Status s;
|
|
{
|
|
unique_ptr<SequentialFile> file;
|
|
s = env_->NewSequentialFile(fname, &file, env_options_);
|
|
if (!s.ok()) {
|
|
Log(InfoLogLevel::INFO_LEVEL, db_options_->info_log,
|
|
"ManifestContains: %s\n", s.ToString().c_str());
|
|
Log(InfoLogLevel::INFO_LEVEL, db_options_->info_log,
|
|
"ManifestContains: is unable to reopen the manifest file %s",
|
|
fname.c_str());
|
|
return false;
|
|
}
|
|
file_reader.reset(new SequentialFileReader(std::move(file)));
|
|
}
|
|
log::Reader reader(std::move(file_reader), nullptr, true /*checksum*/, 0);
|
|
Slice r;
|
|
std::string scratch;
|
|
bool result = false;
|
|
while (reader.ReadRecord(&r, &scratch)) {
|
|
if (r == Slice(record)) {
|
|
result = true;
|
|
break;
|
|
}
|
|
}
|
|
Log(InfoLogLevel::INFO_LEVEL, db_options_->info_log,
|
|
"ManifestContains: result = %d\n", result ? 1 : 0);
|
|
return result;
|
|
}
|
|
|
|
// TODO(aekmekji): in CompactionJob::GenSubcompactionBoundaries(), this
|
|
// function is called repeatedly with consecutive pairs of slices. For example
|
|
// if the slice list is [a, b, c, d] this function is called with arguments
|
|
// (a,b) then (b,c) then (c,d). Knowing this, an optimization is possible where
|
|
// we avoid doing binary search for the keys b and c twice and instead somehow
|
|
// maintain state of where they first appear in the files.
|
|
uint64_t VersionSet::ApproximateSize(Version* v, const Slice& start,
|
|
const Slice& end, int start_level,
|
|
int end_level) {
|
|
// pre-condition
|
|
assert(v->cfd_->internal_comparator().Compare(start, end) <= 0);
|
|
|
|
uint64_t size = 0;
|
|
const auto* vstorage = v->storage_info();
|
|
end_level = end_level == -1
|
|
? vstorage->num_non_empty_levels()
|
|
: std::min(end_level, vstorage->num_non_empty_levels());
|
|
|
|
assert(start_level <= end_level);
|
|
|
|
for (int level = start_level; level < end_level; level++) {
|
|
const LevelFilesBrief& files_brief = vstorage->LevelFilesBrief(level);
|
|
if (!files_brief.num_files) {
|
|
// empty level, skip exploration
|
|
continue;
|
|
}
|
|
|
|
if (!level) {
|
|
// level 0 data is sorted order, handle the use case explicitly
|
|
size += ApproximateSizeLevel0(v, files_brief, start, end);
|
|
continue;
|
|
}
|
|
|
|
assert(level > 0);
|
|
assert(files_brief.num_files > 0);
|
|
|
|
// identify the file position for starting key
|
|
const uint64_t idx_start = FindFileInRange(
|
|
v->cfd_->internal_comparator(), files_brief, start,
|
|
/*start=*/0, static_cast<uint32_t>(files_brief.num_files - 1));
|
|
assert(idx_start < files_brief.num_files);
|
|
|
|
// scan all files from the starting position until the ending position
|
|
// inferred from the sorted order
|
|
for (uint64_t i = idx_start; i < files_brief.num_files; i++) {
|
|
uint64_t val;
|
|
val = ApproximateSize(v, files_brief.files[i], end);
|
|
if (!val) {
|
|
// the files after this will not have the range
|
|
break;
|
|
}
|
|
|
|
size += val;
|
|
|
|
if (i == idx_start) {
|
|
// subtract the bytes needed to be scanned to get to the starting
|
|
// key
|
|
val = ApproximateSize(v, files_brief.files[i], start);
|
|
assert(size >= val);
|
|
size -= val;
|
|
}
|
|
}
|
|
}
|
|
|
|
return size;
|
|
}
|
|
|
|
uint64_t VersionSet::ApproximateSizeLevel0(Version* v,
|
|
const LevelFilesBrief& files_brief,
|
|
const Slice& key_start,
|
|
const Slice& key_end) {
|
|
// level 0 files are not in sorted order, we need to iterate through
|
|
// the list to compute the total bytes that require scanning
|
|
uint64_t size = 0;
|
|
for (size_t i = 0; i < files_brief.num_files; i++) {
|
|
const uint64_t start = ApproximateSize(v, files_brief.files[i], key_start);
|
|
const uint64_t end = ApproximateSize(v, files_brief.files[i], key_end);
|
|
assert(end >= start);
|
|
size += end - start;
|
|
}
|
|
return size;
|
|
}
|
|
|
|
uint64_t VersionSet::ApproximateSize(Version* v, const FdWithKeyRange& f,
|
|
const Slice& key) {
|
|
// pre-condition
|
|
assert(v);
|
|
|
|
uint64_t result = 0;
|
|
if (v->cfd_->internal_comparator().Compare(f.largest_key, key) <= 0) {
|
|
// Entire file is before "key", so just add the file size
|
|
result = f.fd.GetFileSize();
|
|
} else if (v->cfd_->internal_comparator().Compare(f.smallest_key, key) > 0) {
|
|
// Entire file is after "key", so ignore
|
|
result = 0;
|
|
} else {
|
|
// "key" falls in the range for this table. Add the
|
|
// approximate offset of "key" within the table.
|
|
TableReader* table_reader_ptr;
|
|
InternalIterator* iter = v->cfd_->table_cache()->NewIterator(
|
|
ReadOptions(), env_options_, v->cfd_->internal_comparator(), f.fd,
|
|
&table_reader_ptr);
|
|
if (table_reader_ptr != nullptr) {
|
|
result = table_reader_ptr->ApproximateOffsetOf(key);
|
|
}
|
|
delete iter;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
void VersionSet::AddLiveFiles(std::vector<FileDescriptor>* live_list) {
|
|
// pre-calculate space requirement
|
|
int64_t total_files = 0;
|
|
for (auto cfd : *column_family_set_) {
|
|
Version* dummy_versions = cfd->dummy_versions();
|
|
for (Version* v = dummy_versions->next_; v != dummy_versions;
|
|
v = v->next_) {
|
|
const auto* vstorage = v->storage_info();
|
|
for (int level = 0; level < vstorage->num_levels(); level++) {
|
|
total_files += vstorage->LevelFiles(level).size();
|
|
}
|
|
}
|
|
}
|
|
|
|
// just one time extension to the right size
|
|
live_list->reserve(live_list->size() + static_cast<size_t>(total_files));
|
|
|
|
for (auto cfd : *column_family_set_) {
|
|
auto* current = cfd->current();
|
|
bool found_current = false;
|
|
Version* dummy_versions = cfd->dummy_versions();
|
|
for (Version* v = dummy_versions->next_; v != dummy_versions;
|
|
v = v->next_) {
|
|
v->AddLiveFiles(live_list);
|
|
if (v == current) {
|
|
found_current = true;
|
|
}
|
|
}
|
|
if (!found_current && current != nullptr) {
|
|
// Should never happen unless it is a bug.
|
|
assert(false);
|
|
current->AddLiveFiles(live_list);
|
|
}
|
|
}
|
|
}
|
|
|
|
InternalIterator* VersionSet::MakeInputIterator(Compaction* c) {
|
|
auto cfd = c->column_family_data();
|
|
ReadOptions read_options;
|
|
read_options.verify_checksums =
|
|
c->mutable_cf_options()->verify_checksums_in_compaction;
|
|
read_options.fill_cache = false;
|
|
if (c->ShouldFormSubcompactions()) {
|
|
read_options.total_order_seek = true;
|
|
}
|
|
|
|
// Level-0 files have to be merged together. For other levels,
|
|
// we will make a concatenating iterator per level.
|
|
// TODO(opt): use concatenating iterator for level-0 if there is no overlap
|
|
const size_t space = (c->level() == 0 ? c->input_levels(0)->num_files +
|
|
c->num_input_levels() - 1
|
|
: c->num_input_levels());
|
|
InternalIterator** list = new InternalIterator* [space];
|
|
size_t num = 0;
|
|
for (size_t which = 0; which < c->num_input_levels(); which++) {
|
|
if (c->input_levels(which)->num_files != 0) {
|
|
if (c->level(which) == 0) {
|
|
const LevelFilesBrief* flevel = c->input_levels(which);
|
|
for (size_t i = 0; i < flevel->num_files; i++) {
|
|
list[num++] = cfd->table_cache()->NewIterator(
|
|
read_options, env_options_compactions_,
|
|
cfd->internal_comparator(), flevel->files[i].fd, nullptr,
|
|
nullptr, /* no per level latency histogram*/
|
|
true /* for compaction */);
|
|
}
|
|
} else {
|
|
// Create concatenating iterator for the files from this level
|
|
list[num++] = NewTwoLevelIterator(
|
|
new LevelFileIteratorState(
|
|
cfd->table_cache(), read_options, env_options_,
|
|
cfd->internal_comparator(),
|
|
nullptr /* no per level latency histogram */,
|
|
true /* for_compaction */, false /* prefix enabled */),
|
|
new LevelFileNumIterator(cfd->internal_comparator(),
|
|
c->input_levels(which)));
|
|
}
|
|
}
|
|
}
|
|
assert(num <= space);
|
|
InternalIterator* result =
|
|
NewMergingIterator(&c->column_family_data()->internal_comparator(), list,
|
|
static_cast<int>(num));
|
|
delete[] list;
|
|
return result;
|
|
}
|
|
|
|
// verify that the files listed in this compaction are present
|
|
// in the current version
|
|
bool VersionSet::VerifyCompactionFileConsistency(Compaction* c) {
|
|
#ifndef NDEBUG
|
|
Version* version = c->column_family_data()->current();
|
|
const VersionStorageInfo* vstorage = version->storage_info();
|
|
if (c->input_version() != version) {
|
|
Log(InfoLogLevel::INFO_LEVEL, db_options_->info_log,
|
|
"[%s] compaction output being applied to a different base version from"
|
|
" input version",
|
|
c->column_family_data()->GetName().c_str());
|
|
|
|
if (vstorage->compaction_style_ == kCompactionStyleLevel &&
|
|
c->start_level() == 0 && c->num_input_levels() > 2U) {
|
|
// We are doing a L0->base_level compaction. The assumption is if
|
|
// base level is not L1, levels from L1 to base_level - 1 is empty.
|
|
// This is ensured by having one compaction from L0 going on at the
|
|
// same time in level-based compaction. So that during the time, no
|
|
// compaction/flush can put files to those levels.
|
|
for (int l = c->start_level() + 1; l < c->output_level(); l++) {
|
|
if (vstorage->NumLevelFiles(l) != 0) {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
for (size_t input = 0; input < c->num_input_levels(); ++input) {
|
|
int level = c->level(input);
|
|
for (size_t i = 0; i < c->num_input_files(input); ++i) {
|
|
uint64_t number = c->input(input, i)->fd.GetNumber();
|
|
bool found = false;
|
|
for (unsigned int j = 0; j < vstorage->files_[level].size(); j++) {
|
|
FileMetaData* f = vstorage->files_[level][j];
|
|
if (f->fd.GetNumber() == number) {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
if (!found) {
|
|
return false; // input files non existent in current version
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
return true; // everything good
|
|
}
|
|
|
|
Status VersionSet::GetMetadataForFile(uint64_t number, int* filelevel,
|
|
FileMetaData** meta,
|
|
ColumnFamilyData** cfd) {
|
|
for (auto cfd_iter : *column_family_set_) {
|
|
Version* version = cfd_iter->current();
|
|
const auto* vstorage = version->storage_info();
|
|
for (int level = 0; level < vstorage->num_levels(); level++) {
|
|
for (const auto& file : vstorage->LevelFiles(level)) {
|
|
if (file->fd.GetNumber() == number) {
|
|
*meta = file;
|
|
*filelevel = level;
|
|
*cfd = cfd_iter;
|
|
return Status::OK();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return Status::NotFound("File not present in any level");
|
|
}
|
|
|
|
void VersionSet::GetLiveFilesMetaData(std::vector<LiveFileMetaData>* metadata) {
|
|
for (auto cfd : *column_family_set_) {
|
|
if (cfd->IsDropped()) {
|
|
continue;
|
|
}
|
|
for (int level = 0; level < cfd->NumberLevels(); level++) {
|
|
for (const auto& file :
|
|
cfd->current()->storage_info()->LevelFiles(level)) {
|
|
LiveFileMetaData filemetadata;
|
|
filemetadata.column_family_name = cfd->GetName();
|
|
uint32_t path_id = file->fd.GetPathId();
|
|
if (path_id < db_options_->db_paths.size()) {
|
|
filemetadata.db_path = db_options_->db_paths[path_id].path;
|
|
} else {
|
|
assert(!db_options_->db_paths.empty());
|
|
filemetadata.db_path = db_options_->db_paths.back().path;
|
|
}
|
|
filemetadata.name = MakeTableFileName("", file->fd.GetNumber());
|
|
filemetadata.level = level;
|
|
filemetadata.size = file->fd.GetFileSize();
|
|
filemetadata.smallestkey = file->smallest.user_key().ToString();
|
|
filemetadata.largestkey = file->largest.user_key().ToString();
|
|
filemetadata.smallest_seqno = file->smallest_seqno;
|
|
filemetadata.largest_seqno = file->largest_seqno;
|
|
metadata->push_back(filemetadata);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void VersionSet::GetObsoleteFiles(std::vector<FileMetaData*>* files,
|
|
uint64_t min_pending_output) {
|
|
std::vector<FileMetaData*> pending_files;
|
|
for (auto f : obsolete_files_) {
|
|
if (f->fd.GetNumber() < min_pending_output) {
|
|
files->push_back(f);
|
|
} else {
|
|
pending_files.push_back(f);
|
|
}
|
|
}
|
|
obsolete_files_.swap(pending_files);
|
|
}
|
|
|
|
ColumnFamilyData* VersionSet::CreateColumnFamily(
|
|
const ColumnFamilyOptions& cf_options, VersionEdit* edit) {
|
|
assert(edit->is_column_family_add_);
|
|
|
|
Version* dummy_versions = new Version(nullptr, this);
|
|
// Ref() dummy version once so that later we can call Unref() to delete it
|
|
// by avoiding calling "delete" explicitly (~Version is private)
|
|
dummy_versions->Ref();
|
|
auto new_cfd = column_family_set_->CreateColumnFamily(
|
|
edit->column_family_name_, edit->column_family_, dummy_versions,
|
|
cf_options);
|
|
|
|
Version* v = new Version(new_cfd, this, current_version_number_++);
|
|
|
|
// Fill level target base information.
|
|
v->storage_info()->CalculateBaseBytes(*new_cfd->ioptions(),
|
|
*new_cfd->GetLatestMutableCFOptions());
|
|
AppendVersion(new_cfd, v);
|
|
// GetLatestMutableCFOptions() is safe here without mutex since the
|
|
// cfd is not available to client
|
|
new_cfd->CreateNewMemtable(*new_cfd->GetLatestMutableCFOptions(),
|
|
LastSequence());
|
|
new_cfd->SetLogNumber(edit->log_number_);
|
|
return new_cfd;
|
|
}
|
|
|
|
uint64_t VersionSet::GetNumLiveVersions(Version* dummy_versions) {
|
|
uint64_t count = 0;
|
|
for (Version* v = dummy_versions->next_; v != dummy_versions; v = v->next_) {
|
|
count++;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
uint64_t VersionSet::GetTotalSstFilesSize(Version* dummy_versions) {
|
|
std::unordered_set<uint64_t> unique_files;
|
|
uint64_t total_files_size = 0;
|
|
for (Version* v = dummy_versions->next_; v != dummy_versions; v = v->next_) {
|
|
VersionStorageInfo* storage_info = v->storage_info();
|
|
for (int level = 0; level < storage_info->num_levels_; level++) {
|
|
for (const auto& file_meta : storage_info->LevelFiles(level)) {
|
|
if (unique_files.find(file_meta->fd.packed_number_and_path_id) ==
|
|
unique_files.end()) {
|
|
unique_files.insert(file_meta->fd.packed_number_and_path_id);
|
|
total_files_size += file_meta->fd.GetFileSize();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return total_files_size;
|
|
}
|
|
|
|
} // namespace rocksdb
|