6d6776f6b8
Summary: crash_test sometimes fails, hitting the add file overlapping assert. Add information in info logs help us to find the bug. Test Plan: Run all test suites. Do some manual tests to make sure printing is correct. Reviewers: kradhakrishnan, yhchiang, anthony, IslamAbdelRahman, rven, igor Reviewed By: igor Subscribers: leveldb, dhruba Differential Revision: https://reviews.facebook.net/D49017
3432 lines
120 KiB
C++
3432 lines
120 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,
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const ReadOptions& read_options,
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const EnvOptions& env_options,
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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(), cfd->ioptions()->info_log)),
|
|
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) const {
|
|
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::GetPropertiesOfTablesInRange(
|
|
const Range* range, std::size_t n, TablePropertiesCollection* props) const {
|
|
for (int level = 0; level < storage_info_.num_non_empty_levels(); level++) {
|
|
for (decltype(n) i = 0; i < n; i++) {
|
|
// Convert user_key into a corresponding internal key.
|
|
InternalKey k1(range[i].start, kMaxSequenceNumber, kValueTypeForSeek);
|
|
InternalKey k2(range[i].limit, kMaxSequenceNumber, kValueTypeForSeek);
|
|
std::vector<FileMetaData*> files;
|
|
storage_info_.GetOverlappingInputs(level, &k1, &k2, &files, -1, nullptr,
|
|
false);
|
|
for (const auto& file_meta : files) {
|
|
auto fname =
|
|
TableFileName(vset_->db_options_->db_paths,
|
|
file_meta->fd.GetNumber(), file_meta->fd.GetPathId());
|
|
if (props->count(fname) == 0) {
|
|
// 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.
|
|
|
|
uint64_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++) {
|
|
uint64_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;
|
|
uint64_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, Logger* info_log) {
|
|
auto* level_files = &files_[level];
|
|
// Must not overlap
|
|
#ifndef NDEBUG
|
|
if (level > 0 && !level_files->empty() &&
|
|
internal_comparator_->Compare(
|
|
(*level_files)[level_files->size() - 1]->largest, f->smallest) >= 0) {
|
|
auto* f2 = (*level_files)[level_files->size() - 1];
|
|
if (info_log != nullptr) {
|
|
Error(info_log, "Adding new file %" PRIu64
|
|
" range (%s, %s) to level %d but overlapping "
|
|
"with existing file %" PRIu64 " %s %s",
|
|
f->fd.GetNumber(), f->smallest.DebugString(true).c_str(),
|
|
f->largest.DebugString(true).c_str(), level, f2->fd.GetNumber(),
|
|
f2->smallest.DebugString(true).c_str(),
|
|
f2->largest.DebugString(true).c_str());
|
|
LogFlush(info_log);
|
|
}
|
|
assert(false);
|
|
}
|
|
#endif
|
|
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,
|
|
bool expand_range) const {
|
|
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 && expand_range) {
|
|
// 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) const {
|
|
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 {
|
|
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 = NewWritableFile(
|
|
env_, 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;
|
|
}
|
|
TEST_KILL_RANDOM("VersionSet::LogAndApply:BeforeAddRecord",
|
|
rocksdb_kill_odds * REDUCE_ODDS2);
|
|
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
|