6189230202
Summary: Closes https://github.com/facebook/rocksdb/pull/2589 Differential Revision: D5431502 Pulled By: siying fbshipit-source-id: 8ebf8c87883daa9daa54b2303d11ce01ab1f6f75
1466 lines
54 KiB
C++
1466 lines
54 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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// 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/compaction_picker.h"
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#ifndef __STDC_FORMAT_MACROS
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#define __STDC_FORMAT_MACROS
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#endif
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#include <inttypes.h>
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#include <limits>
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#include <queue>
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#include <string>
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#include <utility>
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#include "db/column_family.h"
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#include "monitoring/statistics.h"
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#include "util/filename.h"
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#include "util/log_buffer.h"
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#include "util/random.h"
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#include "util/string_util.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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uint64_t TotalCompensatedFileSize(const std::vector<FileMetaData*>& files) {
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uint64_t sum = 0;
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for (size_t i = 0; i < files.size() && files[i]; i++) {
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sum += files[i]->compensated_file_size;
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}
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return sum;
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}
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} // anonymous namespace
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// Determine compression type, based on user options, level of the output
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// file and whether compression is disabled.
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// If enable_compression is false, then compression is always disabled no
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// matter what the values of the other two parameters are.
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// Otherwise, the compression type is determined based on options and level.
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CompressionType GetCompressionType(const ImmutableCFOptions& ioptions,
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const VersionStorageInfo* vstorage,
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const MutableCFOptions& mutable_cf_options,
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int level, int base_level,
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const bool enable_compression) {
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if (!enable_compression) {
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// disable compression
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return kNoCompression;
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}
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// If bottommost_compression is set and we are compacting to the
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// bottommost level then we should use it.
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if (ioptions.bottommost_compression != kDisableCompressionOption &&
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level > base_level && level >= (vstorage->num_non_empty_levels() - 1)) {
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return ioptions.bottommost_compression;
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}
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// If the user has specified a different compression level for each level,
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// then pick the compression for that level.
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if (!ioptions.compression_per_level.empty()) {
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assert(level == 0 || level >= base_level);
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int idx = (level == 0) ? 0 : level - base_level + 1;
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const int n = static_cast<int>(ioptions.compression_per_level.size()) - 1;
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// It is possible for level_ to be -1; in that case, we use level
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// 0's compression. This occurs mostly in backwards compatibility
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// situations when the builder doesn't know what level the file
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// belongs to. Likewise, if level is beyond the end of the
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// specified compression levels, use the last value.
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return ioptions.compression_per_level[std::max(0, std::min(idx, n))];
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} else {
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return mutable_cf_options.compression;
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}
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}
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CompactionPicker::CompactionPicker(const ImmutableCFOptions& ioptions,
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const InternalKeyComparator* icmp)
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: ioptions_(ioptions), icmp_(icmp) {}
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CompactionPicker::~CompactionPicker() {}
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// Delete this compaction from the list of running compactions.
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void CompactionPicker::ReleaseCompactionFiles(Compaction* c, Status status) {
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UnregisterCompaction(c);
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if (!status.ok()) {
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c->ResetNextCompactionIndex();
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}
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}
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void CompactionPicker::GetRange(const CompactionInputFiles& inputs,
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InternalKey* smallest,
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InternalKey* largest) const {
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const int level = inputs.level;
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assert(!inputs.empty());
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smallest->Clear();
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largest->Clear();
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if (level == 0) {
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for (size_t i = 0; i < inputs.size(); i++) {
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FileMetaData* f = inputs[i];
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if (i == 0) {
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*smallest = f->smallest;
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*largest = f->largest;
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} else {
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if (icmp_->Compare(f->smallest, *smallest) < 0) {
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*smallest = f->smallest;
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}
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if (icmp_->Compare(f->largest, *largest) > 0) {
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*largest = f->largest;
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}
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}
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}
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} else {
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*smallest = inputs[0]->smallest;
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*largest = inputs[inputs.size() - 1]->largest;
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}
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}
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void CompactionPicker::GetRange(const CompactionInputFiles& inputs1,
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const CompactionInputFiles& inputs2,
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InternalKey* smallest,
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InternalKey* largest) const {
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assert(!inputs1.empty() || !inputs2.empty());
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if (inputs1.empty()) {
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GetRange(inputs2, smallest, largest);
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} else if (inputs2.empty()) {
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GetRange(inputs1, smallest, largest);
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} else {
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InternalKey smallest1, smallest2, largest1, largest2;
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GetRange(inputs1, &smallest1, &largest1);
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GetRange(inputs2, &smallest2, &largest2);
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*smallest =
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icmp_->Compare(smallest1, smallest2) < 0 ? smallest1 : smallest2;
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*largest = icmp_->Compare(largest1, largest2) < 0 ? largest2 : largest1;
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}
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}
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void CompactionPicker::GetRange(const std::vector<CompactionInputFiles>& inputs,
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InternalKey* smallest,
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InternalKey* largest) const {
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InternalKey current_smallest;
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InternalKey current_largest;
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bool initialized = false;
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for (const auto& in : inputs) {
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if (in.empty()) {
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continue;
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}
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GetRange(in, ¤t_smallest, ¤t_largest);
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if (!initialized) {
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*smallest = current_smallest;
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*largest = current_largest;
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initialized = true;
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} else {
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if (icmp_->Compare(current_smallest, *smallest) < 0) {
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*smallest = current_smallest;
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}
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if (icmp_->Compare(current_largest, *largest) > 0) {
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*largest = current_largest;
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}
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}
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}
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assert(initialized);
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}
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bool CompactionPicker::ExpandInputsToCleanCut(const std::string& cf_name,
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VersionStorageInfo* vstorage,
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CompactionInputFiles* inputs) {
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// This isn't good compaction
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assert(!inputs->empty());
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const int level = inputs->level;
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// GetOverlappingInputs will always do the right thing for level-0.
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// So we don't need to do any expansion if level == 0.
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if (level == 0) {
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return true;
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}
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InternalKey smallest, largest;
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// Keep expanding inputs until we are sure that there is a "clean cut"
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// boundary between the files in input and the surrounding files.
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// This will ensure that no parts of a key are lost during compaction.
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int hint_index = -1;
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size_t old_size;
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do {
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old_size = inputs->size();
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GetRange(*inputs, &smallest, &largest);
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inputs->clear();
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vstorage->GetOverlappingInputs(level, &smallest, &largest, &inputs->files,
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hint_index, &hint_index);
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} while (inputs->size() > old_size);
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// we started off with inputs non-empty and the previous loop only grew
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// inputs. thus, inputs should be non-empty here
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assert(!inputs->empty());
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// If, after the expansion, there are files that are already under
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// compaction, then we must drop/cancel this compaction.
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if (AreFilesInCompaction(inputs->files)) {
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ROCKS_LOG_WARN(
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ioptions_.info_log,
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"[%s] ExpandWhileOverlapping() failure because some of the necessary"
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" compaction input files are currently being compacted.",
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cf_name.c_str());
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return false;
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}
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return true;
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}
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bool CompactionPicker::RangeOverlapWithCompaction(
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const Slice& smallest_user_key, const Slice& largest_user_key,
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int level) const {
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const Comparator* ucmp = icmp_->user_comparator();
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for (Compaction* c : compactions_in_progress_) {
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if (c->output_level() == level &&
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ucmp->Compare(smallest_user_key, c->GetLargestUserKey()) <= 0 &&
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ucmp->Compare(largest_user_key, c->GetSmallestUserKey()) >= 0) {
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// Overlap
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return true;
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}
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}
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// Did not overlap with any running compaction in level `level`
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return false;
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}
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bool CompactionPicker::FilesRangeOverlapWithCompaction(
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const std::vector<CompactionInputFiles>& inputs, int level) const {
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bool is_empty = true;
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for (auto& in : inputs) {
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if (!in.empty()) {
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is_empty = false;
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break;
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}
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}
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if (is_empty) {
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// No files in inputs
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return false;
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}
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InternalKey smallest, largest;
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GetRange(inputs, &smallest, &largest);
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return RangeOverlapWithCompaction(smallest.user_key(), largest.user_key(),
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level);
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}
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// Returns true if any one of specified files are being compacted
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bool CompactionPicker::AreFilesInCompaction(
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const std::vector<FileMetaData*>& files) {
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for (size_t i = 0; i < files.size(); i++) {
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if (files[i]->being_compacted) {
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return true;
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}
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}
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return false;
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}
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Compaction* CompactionPicker::CompactFiles(
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const CompactionOptions& compact_options,
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const std::vector<CompactionInputFiles>& input_files, int output_level,
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VersionStorageInfo* vstorage, const MutableCFOptions& mutable_cf_options,
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uint32_t output_path_id) {
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assert(input_files.size());
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// TODO(rven ): we might be able to run concurrent level 0 compaction
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// if the key ranges of the two compactions do not overlap, but for now
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// we do not allow it.
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if ((input_files[0].level == 0) && !level0_compactions_in_progress_.empty()) {
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return nullptr;
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}
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// This compaction output could overlap with a running compaction
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if (FilesRangeOverlapWithCompaction(input_files, output_level)) {
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return nullptr;
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}
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auto c =
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new Compaction(vstorage, ioptions_, mutable_cf_options, input_files,
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output_level, compact_options.output_file_size_limit,
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mutable_cf_options.max_compaction_bytes, output_path_id,
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compact_options.compression, /* grandparents */ {}, true);
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// If it's level 0 compaction, make sure we don't execute any other level 0
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// compactions in parallel
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RegisterCompaction(c);
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return c;
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}
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Status CompactionPicker::GetCompactionInputsFromFileNumbers(
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std::vector<CompactionInputFiles>* input_files,
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std::unordered_set<uint64_t>* input_set, const VersionStorageInfo* vstorage,
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const CompactionOptions& compact_options) const {
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if (input_set->size() == 0U) {
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return Status::InvalidArgument(
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"Compaction must include at least one file.");
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}
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assert(input_files);
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std::vector<CompactionInputFiles> matched_input_files;
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matched_input_files.resize(vstorage->num_levels());
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int first_non_empty_level = -1;
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int last_non_empty_level = -1;
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// TODO(yhchiang): use a lazy-initialized mapping from
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// file_number to FileMetaData in Version.
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for (int level = 0; level < vstorage->num_levels(); ++level) {
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for (auto file : vstorage->LevelFiles(level)) {
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auto iter = input_set->find(file->fd.GetNumber());
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if (iter != input_set->end()) {
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matched_input_files[level].files.push_back(file);
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input_set->erase(iter);
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last_non_empty_level = level;
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if (first_non_empty_level == -1) {
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first_non_empty_level = level;
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}
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}
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}
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}
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if (!input_set->empty()) {
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std::string message(
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"Cannot find matched SST files for the following file numbers:");
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for (auto fn : *input_set) {
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message += " ";
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message += ToString(fn);
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}
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return Status::InvalidArgument(message);
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}
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for (int level = first_non_empty_level; level <= last_non_empty_level;
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++level) {
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matched_input_files[level].level = level;
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input_files->emplace_back(std::move(matched_input_files[level]));
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}
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return Status::OK();
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}
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// Returns true if any one of the parent files are being compacted
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bool CompactionPicker::IsRangeInCompaction(VersionStorageInfo* vstorage,
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const InternalKey* smallest,
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const InternalKey* largest,
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int level, int* level_index) {
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std::vector<FileMetaData*> inputs;
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assert(level < NumberLevels());
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vstorage->GetOverlappingInputs(level, smallest, largest, &inputs,
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*level_index, level_index);
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return AreFilesInCompaction(inputs);
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}
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// Populates the set of inputs of all other levels that overlap with the
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// start level.
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// Now we assume all levels except start level and output level are empty.
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// Will also attempt to expand "start level" if that doesn't expand
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// "output level" or cause "level" to include a file for compaction that has an
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// overlapping user-key with another file.
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// REQUIRES: input_level and output_level are different
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// REQUIRES: inputs->empty() == false
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// Returns false if files on parent level are currently in compaction, which
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// means that we can't compact them
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bool CompactionPicker::SetupOtherInputs(
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const std::string& cf_name, const MutableCFOptions& mutable_cf_options,
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VersionStorageInfo* vstorage, CompactionInputFiles* inputs,
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CompactionInputFiles* output_level_inputs, int* parent_index,
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int base_index) {
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assert(!inputs->empty());
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assert(output_level_inputs->empty());
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const int input_level = inputs->level;
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const int output_level = output_level_inputs->level;
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assert(input_level != output_level);
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// For now, we only support merging two levels, start level and output level.
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// We need to assert other levels are empty.
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for (int l = input_level + 1; l < output_level; l++) {
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assert(vstorage->NumLevelFiles(l) == 0);
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}
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InternalKey smallest, largest;
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// Get the range one last time.
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GetRange(*inputs, &smallest, &largest);
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// Populate the set of next-level files (inputs_GetOutputLevelInputs()) to
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// include in compaction
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vstorage->GetOverlappingInputs(output_level, &smallest, &largest,
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&output_level_inputs->files, *parent_index,
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parent_index);
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if (AreFilesInCompaction(output_level_inputs->files)) {
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return false;
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}
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if (!output_level_inputs->empty()) {
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if (!ExpandInputsToCleanCut(cf_name, vstorage, output_level_inputs)) {
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return false;
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}
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}
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// See if we can further grow the number of inputs in "level" without
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// changing the number of "level+1" files we pick up. We also choose NOT
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// to expand if this would cause "level" to include some entries for some
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// user key, while excluding other entries for the same user key. This
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// can happen when one user key spans multiple files.
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if (!output_level_inputs->empty()) {
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const uint64_t limit = mutable_cf_options.max_compaction_bytes;
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const uint64_t output_level_inputs_size =
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TotalCompensatedFileSize(output_level_inputs->files);
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const uint64_t inputs_size = TotalCompensatedFileSize(inputs->files);
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bool expand_inputs = false;
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CompactionInputFiles expanded_inputs;
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expanded_inputs.level = input_level;
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// Get closed interval of output level
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InternalKey all_start, all_limit;
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GetRange(*inputs, *output_level_inputs, &all_start, &all_limit);
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bool try_overlapping_inputs = true;
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vstorage->GetOverlappingInputs(input_level, &all_start, &all_limit,
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&expanded_inputs.files, base_index, nullptr);
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uint64_t expanded_inputs_size =
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TotalCompensatedFileSize(expanded_inputs.files);
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if (!ExpandInputsToCleanCut(cf_name, vstorage, &expanded_inputs)) {
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try_overlapping_inputs = false;
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}
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if (try_overlapping_inputs && expanded_inputs.size() > inputs->size() &&
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output_level_inputs_size + expanded_inputs_size < limit &&
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!AreFilesInCompaction(expanded_inputs.files)) {
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InternalKey new_start, new_limit;
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GetRange(expanded_inputs, &new_start, &new_limit);
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CompactionInputFiles expanded_output_level_inputs;
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expanded_output_level_inputs.level = output_level;
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vstorage->GetOverlappingInputs(output_level, &new_start, &new_limit,
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&expanded_output_level_inputs.files,
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*parent_index, parent_index);
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assert(!expanded_output_level_inputs.empty());
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if (!AreFilesInCompaction(expanded_output_level_inputs.files) &&
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ExpandInputsToCleanCut(cf_name, vstorage,
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&expanded_output_level_inputs) &&
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expanded_output_level_inputs.size() == output_level_inputs->size()) {
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expand_inputs = true;
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}
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}
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if (!expand_inputs) {
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vstorage->GetCleanInputsWithinInterval(input_level, &all_start,
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&all_limit, &expanded_inputs.files,
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base_index, nullptr);
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expanded_inputs_size = TotalCompensatedFileSize(expanded_inputs.files);
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if (expanded_inputs.size() > inputs->size() &&
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output_level_inputs_size + expanded_inputs_size < limit &&
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!AreFilesInCompaction(expanded_inputs.files)) {
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expand_inputs = true;
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}
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}
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if (expand_inputs) {
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ROCKS_LOG_INFO(ioptions_.info_log,
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"[%s] Expanding@%d %" ROCKSDB_PRIszt "+%" ROCKSDB_PRIszt
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"(%" PRIu64 "+%" PRIu64 " bytes) to %" ROCKSDB_PRIszt
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"+%" ROCKSDB_PRIszt " (%" PRIu64 "+%" PRIu64 "bytes)\n",
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cf_name.c_str(), input_level, inputs->size(),
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output_level_inputs->size(), inputs_size,
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output_level_inputs_size, expanded_inputs.size(),
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output_level_inputs->size(), expanded_inputs_size,
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output_level_inputs_size);
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inputs->files = expanded_inputs.files;
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}
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}
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return true;
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}
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void CompactionPicker::GetGrandparents(
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VersionStorageInfo* vstorage, const CompactionInputFiles& inputs,
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const CompactionInputFiles& output_level_inputs,
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std::vector<FileMetaData*>* grandparents) {
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InternalKey start, limit;
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GetRange(inputs, output_level_inputs, &start, &limit);
|
|
// Compute the set of grandparent files that overlap this compaction
|
|
// (parent == level+1; grandparent == level+2)
|
|
if (output_level_inputs.level + 1 < NumberLevels()) {
|
|
vstorage->GetOverlappingInputs(output_level_inputs.level + 1, &start,
|
|
&limit, grandparents);
|
|
}
|
|
}
|
|
|
|
Compaction* CompactionPicker::CompactRange(
|
|
const std::string& cf_name, const MutableCFOptions& mutable_cf_options,
|
|
VersionStorageInfo* vstorage, int input_level, int output_level,
|
|
uint32_t output_path_id, const InternalKey* begin, const InternalKey* end,
|
|
InternalKey** compaction_end, bool* manual_conflict) {
|
|
// CompactionPickerFIFO has its own implementation of compact range
|
|
assert(ioptions_.compaction_style != kCompactionStyleFIFO);
|
|
|
|
if (input_level == ColumnFamilyData::kCompactAllLevels) {
|
|
assert(ioptions_.compaction_style == kCompactionStyleUniversal);
|
|
|
|
// Universal compaction with more than one level always compacts all the
|
|
// files together to the last level.
|
|
assert(vstorage->num_levels() > 1);
|
|
// DBImpl::CompactRange() set output level to be the last level
|
|
assert(output_level == vstorage->num_levels() - 1);
|
|
// DBImpl::RunManualCompaction will make full range for universal compaction
|
|
assert(begin == nullptr);
|
|
assert(end == nullptr);
|
|
*compaction_end = nullptr;
|
|
|
|
int start_level = 0;
|
|
for (; start_level < vstorage->num_levels() &&
|
|
vstorage->NumLevelFiles(start_level) == 0;
|
|
start_level++) {
|
|
}
|
|
if (start_level == vstorage->num_levels()) {
|
|
return nullptr;
|
|
}
|
|
|
|
if ((start_level == 0) && (!level0_compactions_in_progress_.empty())) {
|
|
*manual_conflict = true;
|
|
// Only one level 0 compaction allowed
|
|
return nullptr;
|
|
}
|
|
|
|
std::vector<CompactionInputFiles> inputs(vstorage->num_levels() -
|
|
start_level);
|
|
for (int level = start_level; level < vstorage->num_levels(); level++) {
|
|
inputs[level - start_level].level = level;
|
|
auto& files = inputs[level - start_level].files;
|
|
for (FileMetaData* f : vstorage->LevelFiles(level)) {
|
|
files.push_back(f);
|
|
}
|
|
if (AreFilesInCompaction(files)) {
|
|
*manual_conflict = true;
|
|
return nullptr;
|
|
}
|
|
}
|
|
|
|
// 2 non-exclusive manual compactions could run at the same time producing
|
|
// overlaping outputs in the same level.
|
|
if (FilesRangeOverlapWithCompaction(inputs, output_level)) {
|
|
// This compaction output could potentially conflict with the output
|
|
// of a currently running compaction, we cannot run it.
|
|
*manual_conflict = true;
|
|
return nullptr;
|
|
}
|
|
|
|
Compaction* c = new Compaction(
|
|
vstorage, ioptions_, mutable_cf_options, std::move(inputs),
|
|
output_level, mutable_cf_options.MaxFileSizeForLevel(output_level),
|
|
/* max_compaction_bytes */ LLONG_MAX, output_path_id,
|
|
GetCompressionType(ioptions_, vstorage, mutable_cf_options,
|
|
output_level, 1),
|
|
/* grandparents */ {}, /* is manual */ true);
|
|
RegisterCompaction(c);
|
|
return c;
|
|
}
|
|
|
|
CompactionInputFiles inputs;
|
|
inputs.level = input_level;
|
|
bool covering_the_whole_range = true;
|
|
|
|
// All files are 'overlapping' in universal style compaction.
|
|
// We have to compact the entire range in one shot.
|
|
if (ioptions_.compaction_style == kCompactionStyleUniversal) {
|
|
begin = nullptr;
|
|
end = nullptr;
|
|
}
|
|
|
|
vstorage->GetOverlappingInputs(input_level, begin, end, &inputs.files);
|
|
if (inputs.empty()) {
|
|
return nullptr;
|
|
}
|
|
|
|
if ((input_level == 0) && (!level0_compactions_in_progress_.empty())) {
|
|
// Only one level 0 compaction allowed
|
|
TEST_SYNC_POINT("CompactionPicker::CompactRange:Conflict");
|
|
*manual_conflict = true;
|
|
return nullptr;
|
|
}
|
|
|
|
// Avoid compacting too much in one shot in case the range is large.
|
|
// But we cannot do this for level-0 since level-0 files can overlap
|
|
// and we must not pick one file and drop another older file if the
|
|
// two files overlap.
|
|
if (input_level > 0) {
|
|
const uint64_t limit = mutable_cf_options.max_compaction_bytes;
|
|
uint64_t total = 0;
|
|
for (size_t i = 0; i + 1 < inputs.size(); ++i) {
|
|
uint64_t s = inputs[i]->compensated_file_size;
|
|
total += s;
|
|
if (total >= limit) {
|
|
**compaction_end = inputs[i + 1]->smallest;
|
|
covering_the_whole_range = false;
|
|
inputs.files.resize(i + 1);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
assert(output_path_id < static_cast<uint32_t>(ioptions_.db_paths.size()));
|
|
|
|
if (ExpandInputsToCleanCut(cf_name, vstorage, &inputs) == false) {
|
|
// manual compaction is now multi-threaded, so it can
|
|
// happen that ExpandWhileOverlapping fails
|
|
// we handle it higher in RunManualCompaction
|
|
*manual_conflict = true;
|
|
return nullptr;
|
|
}
|
|
|
|
if (covering_the_whole_range) {
|
|
*compaction_end = nullptr;
|
|
}
|
|
|
|
CompactionInputFiles output_level_inputs;
|
|
if (output_level == ColumnFamilyData::kCompactToBaseLevel) {
|
|
assert(input_level == 0);
|
|
output_level = vstorage->base_level();
|
|
assert(output_level > 0);
|
|
}
|
|
output_level_inputs.level = output_level;
|
|
if (input_level != output_level) {
|
|
int parent_index = -1;
|
|
if (!SetupOtherInputs(cf_name, mutable_cf_options, vstorage, &inputs,
|
|
&output_level_inputs, &parent_index, -1)) {
|
|
// manual compaction is now multi-threaded, so it can
|
|
// happen that SetupOtherInputs fails
|
|
// we handle it higher in RunManualCompaction
|
|
*manual_conflict = true;
|
|
return nullptr;
|
|
}
|
|
}
|
|
|
|
std::vector<CompactionInputFiles> compaction_inputs({inputs});
|
|
if (!output_level_inputs.empty()) {
|
|
compaction_inputs.push_back(output_level_inputs);
|
|
}
|
|
for (size_t i = 0; i < compaction_inputs.size(); i++) {
|
|
if (AreFilesInCompaction(compaction_inputs[i].files)) {
|
|
*manual_conflict = true;
|
|
return nullptr;
|
|
}
|
|
}
|
|
|
|
// 2 non-exclusive manual compactions could run at the same time producing
|
|
// overlaping outputs in the same level.
|
|
if (FilesRangeOverlapWithCompaction(compaction_inputs, output_level)) {
|
|
// This compaction output could potentially conflict with the output
|
|
// of a currently running compaction, we cannot run it.
|
|
*manual_conflict = true;
|
|
return nullptr;
|
|
}
|
|
|
|
std::vector<FileMetaData*> grandparents;
|
|
GetGrandparents(vstorage, inputs, output_level_inputs, &grandparents);
|
|
Compaction* compaction = new Compaction(
|
|
vstorage, ioptions_, mutable_cf_options, std::move(compaction_inputs),
|
|
output_level, mutable_cf_options.MaxFileSizeForLevel(output_level),
|
|
mutable_cf_options.max_compaction_bytes, output_path_id,
|
|
GetCompressionType(ioptions_, vstorage, mutable_cf_options, output_level,
|
|
vstorage->base_level()),
|
|
std::move(grandparents), /* is manual compaction */ true);
|
|
|
|
TEST_SYNC_POINT_CALLBACK("CompactionPicker::CompactRange:Return", compaction);
|
|
RegisterCompaction(compaction);
|
|
|
|
// Creating a compaction influences the compaction score because the score
|
|
// takes running compactions into account (by skipping files that are already
|
|
// being compacted). Since we just changed compaction score, we recalculate it
|
|
// here
|
|
vstorage->ComputeCompactionScore(ioptions_, mutable_cf_options);
|
|
|
|
return compaction;
|
|
}
|
|
|
|
#ifndef ROCKSDB_LITE
|
|
namespace {
|
|
// Test whether two files have overlapping key-ranges.
|
|
bool HaveOverlappingKeyRanges(const Comparator* c, const SstFileMetaData& a,
|
|
const SstFileMetaData& b) {
|
|
if (c->Compare(a.smallestkey, b.smallestkey) >= 0) {
|
|
if (c->Compare(a.smallestkey, b.largestkey) <= 0) {
|
|
// b.smallestkey <= a.smallestkey <= b.largestkey
|
|
return true;
|
|
}
|
|
} else if (c->Compare(a.largestkey, b.smallestkey) >= 0) {
|
|
// a.smallestkey < b.smallestkey <= a.largestkey
|
|
return true;
|
|
}
|
|
if (c->Compare(a.largestkey, b.largestkey) <= 0) {
|
|
if (c->Compare(a.largestkey, b.smallestkey) >= 0) {
|
|
// b.smallestkey <= a.largestkey <= b.largestkey
|
|
return true;
|
|
}
|
|
} else if (c->Compare(a.smallestkey, b.largestkey) <= 0) {
|
|
// a.smallestkey <= b.largestkey < a.largestkey
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
} // namespace
|
|
|
|
Status CompactionPicker::SanitizeCompactionInputFilesForAllLevels(
|
|
std::unordered_set<uint64_t>* input_files,
|
|
const ColumnFamilyMetaData& cf_meta, const int output_level) const {
|
|
auto& levels = cf_meta.levels;
|
|
auto comparator = icmp_->user_comparator();
|
|
|
|
// TODO(yhchiang): If there is any input files of L1 or up and there
|
|
// is at least one L0 files. All L0 files older than the L0 file needs
|
|
// to be included. Otherwise, it is a false conditoin
|
|
|
|
// TODO(yhchiang): add is_adjustable to CompactionOptions
|
|
|
|
// the smallest and largest key of the current compaction input
|
|
std::string smallestkey;
|
|
std::string largestkey;
|
|
// a flag for initializing smallest and largest key
|
|
bool is_first = false;
|
|
const int kNotFound = -1;
|
|
|
|
// For each level, it does the following things:
|
|
// 1. Find the first and the last compaction input files
|
|
// in the current level.
|
|
// 2. Include all files between the first and the last
|
|
// compaction input files.
|
|
// 3. Update the compaction key-range.
|
|
// 4. For all remaining levels, include files that have
|
|
// overlapping key-range with the compaction key-range.
|
|
for (int l = 0; l <= output_level; ++l) {
|
|
auto& current_files = levels[l].files;
|
|
int first_included = static_cast<int>(current_files.size());
|
|
int last_included = kNotFound;
|
|
|
|
// identify the first and the last compaction input files
|
|
// in the current level.
|
|
for (size_t f = 0; f < current_files.size(); ++f) {
|
|
if (input_files->find(TableFileNameToNumber(current_files[f].name)) !=
|
|
input_files->end()) {
|
|
first_included = std::min(first_included, static_cast<int>(f));
|
|
last_included = std::max(last_included, static_cast<int>(f));
|
|
if (is_first == false) {
|
|
smallestkey = current_files[f].smallestkey;
|
|
largestkey = current_files[f].largestkey;
|
|
is_first = true;
|
|
}
|
|
}
|
|
}
|
|
if (last_included == kNotFound) {
|
|
continue;
|
|
}
|
|
|
|
if (l != 0) {
|
|
// expend the compaction input of the current level if it
|
|
// has overlapping key-range with other non-compaction input
|
|
// files in the same level.
|
|
while (first_included > 0) {
|
|
if (comparator->Compare(current_files[first_included - 1].largestkey,
|
|
current_files[first_included].smallestkey) <
|
|
0) {
|
|
break;
|
|
}
|
|
first_included--;
|
|
}
|
|
|
|
while (last_included < static_cast<int>(current_files.size()) - 1) {
|
|
if (comparator->Compare(current_files[last_included + 1].smallestkey,
|
|
current_files[last_included].largestkey) > 0) {
|
|
break;
|
|
}
|
|
last_included++;
|
|
}
|
|
}
|
|
|
|
// include all files between the first and the last compaction input files.
|
|
for (int f = first_included; f <= last_included; ++f) {
|
|
if (current_files[f].being_compacted) {
|
|
return Status::Aborted("Necessary compaction input file " +
|
|
current_files[f].name +
|
|
" is currently being compacted.");
|
|
}
|
|
input_files->insert(TableFileNameToNumber(current_files[f].name));
|
|
}
|
|
|
|
// update smallest and largest key
|
|
if (l == 0) {
|
|
for (int f = first_included; f <= last_included; ++f) {
|
|
if (comparator->Compare(smallestkey, current_files[f].smallestkey) >
|
|
0) {
|
|
smallestkey = current_files[f].smallestkey;
|
|
}
|
|
if (comparator->Compare(largestkey, current_files[f].largestkey) < 0) {
|
|
largestkey = current_files[f].largestkey;
|
|
}
|
|
}
|
|
} else {
|
|
if (comparator->Compare(smallestkey,
|
|
current_files[first_included].smallestkey) > 0) {
|
|
smallestkey = current_files[first_included].smallestkey;
|
|
}
|
|
if (comparator->Compare(largestkey,
|
|
current_files[last_included].largestkey) < 0) {
|
|
largestkey = current_files[last_included].largestkey;
|
|
}
|
|
}
|
|
|
|
SstFileMetaData aggregated_file_meta;
|
|
aggregated_file_meta.smallestkey = smallestkey;
|
|
aggregated_file_meta.largestkey = largestkey;
|
|
|
|
// For all lower levels, include all overlapping files.
|
|
// We need to add overlapping files from the current level too because even
|
|
// if there no input_files in level l, we would still need to add files
|
|
// which overlap with the range containing the input_files in levels 0 to l
|
|
// Level 0 doesn't need to be handled this way because files are sorted by
|
|
// time and not by key
|
|
for (int m = std::max(l, 1); m <= output_level; ++m) {
|
|
for (auto& next_lv_file : levels[m].files) {
|
|
if (HaveOverlappingKeyRanges(comparator, aggregated_file_meta,
|
|
next_lv_file)) {
|
|
if (next_lv_file.being_compacted) {
|
|
return Status::Aborted(
|
|
"File " + next_lv_file.name +
|
|
" that has overlapping key range with one of the compaction "
|
|
" input file is currently being compacted.");
|
|
}
|
|
input_files->insert(TableFileNameToNumber(next_lv_file.name));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return Status::OK();
|
|
}
|
|
|
|
Status CompactionPicker::SanitizeCompactionInputFiles(
|
|
std::unordered_set<uint64_t>* input_files,
|
|
const ColumnFamilyMetaData& cf_meta, const int output_level) const {
|
|
assert(static_cast<int>(cf_meta.levels.size()) - 1 ==
|
|
cf_meta.levels[cf_meta.levels.size() - 1].level);
|
|
if (output_level >= static_cast<int>(cf_meta.levels.size())) {
|
|
return Status::InvalidArgument(
|
|
"Output level for column family " + cf_meta.name +
|
|
" must between [0, " +
|
|
ToString(cf_meta.levels[cf_meta.levels.size() - 1].level) + "].");
|
|
}
|
|
|
|
if (output_level > MaxOutputLevel()) {
|
|
return Status::InvalidArgument(
|
|
"Exceed the maximum output level defined by "
|
|
"the current compaction algorithm --- " +
|
|
ToString(MaxOutputLevel()));
|
|
}
|
|
|
|
if (output_level < 0) {
|
|
return Status::InvalidArgument("Output level cannot be negative.");
|
|
}
|
|
|
|
if (input_files->size() == 0) {
|
|
return Status::InvalidArgument(
|
|
"A compaction must contain at least one file.");
|
|
}
|
|
|
|
Status s = SanitizeCompactionInputFilesForAllLevels(input_files, cf_meta,
|
|
output_level);
|
|
|
|
if (!s.ok()) {
|
|
return s;
|
|
}
|
|
|
|
// for all input files, check whether the file number matches
|
|
// any currently-existing files.
|
|
for (auto file_num : *input_files) {
|
|
bool found = false;
|
|
for (auto level_meta : cf_meta.levels) {
|
|
for (auto file_meta : level_meta.files) {
|
|
if (file_num == TableFileNameToNumber(file_meta.name)) {
|
|
if (file_meta.being_compacted) {
|
|
return Status::Aborted("Specified compaction input file " +
|
|
MakeTableFileName("", file_num) +
|
|
" is already being compacted.");
|
|
}
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
if (found) {
|
|
break;
|
|
}
|
|
}
|
|
if (!found) {
|
|
return Status::InvalidArgument(
|
|
"Specified compaction input file " + MakeTableFileName("", file_num) +
|
|
" does not exist in column family " + cf_meta.name + ".");
|
|
}
|
|
}
|
|
|
|
return Status::OK();
|
|
}
|
|
#endif // !ROCKSDB_LITE
|
|
|
|
void CompactionPicker::RegisterCompaction(Compaction* c) {
|
|
if (c == nullptr) {
|
|
return;
|
|
}
|
|
assert(ioptions_.compaction_style != kCompactionStyleLevel ||
|
|
c->output_level() == 0 ||
|
|
!FilesRangeOverlapWithCompaction(*c->inputs(), c->output_level()));
|
|
if (c->start_level() == 0 ||
|
|
ioptions_.compaction_style == kCompactionStyleUniversal) {
|
|
level0_compactions_in_progress_.insert(c);
|
|
}
|
|
compactions_in_progress_.insert(c);
|
|
}
|
|
|
|
void CompactionPicker::UnregisterCompaction(Compaction* c) {
|
|
if (c == nullptr) {
|
|
return;
|
|
}
|
|
if (c->start_level() == 0 ||
|
|
ioptions_.compaction_style == kCompactionStyleUniversal) {
|
|
level0_compactions_in_progress_.erase(c);
|
|
}
|
|
compactions_in_progress_.erase(c);
|
|
}
|
|
|
|
bool LevelCompactionPicker::NeedsCompaction(
|
|
const VersionStorageInfo* vstorage) const {
|
|
if (!vstorage->FilesMarkedForCompaction().empty()) {
|
|
return true;
|
|
}
|
|
for (int i = 0; i <= vstorage->MaxInputLevel(); i++) {
|
|
if (vstorage->CompactionScore(i) >= 1) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
namespace {
|
|
// A class to build a leveled compaction step-by-step.
|
|
class LevelCompactionBuilder {
|
|
public:
|
|
LevelCompactionBuilder(const std::string& cf_name,
|
|
VersionStorageInfo* vstorage,
|
|
CompactionPicker* compaction_picker,
|
|
LogBuffer* log_buffer,
|
|
const MutableCFOptions& mutable_cf_options,
|
|
const ImmutableCFOptions& ioptions)
|
|
: cf_name_(cf_name),
|
|
vstorage_(vstorage),
|
|
compaction_picker_(compaction_picker),
|
|
log_buffer_(log_buffer),
|
|
mutable_cf_options_(mutable_cf_options),
|
|
ioptions_(ioptions) {}
|
|
|
|
// Pick and return a compaction.
|
|
Compaction* PickCompaction();
|
|
|
|
// Pick the initial files to compact to the next level. (or together
|
|
// in Intra-L0 compactions)
|
|
void SetupInitialFiles();
|
|
|
|
// If the initial files are from L0 level, pick other L0
|
|
// files if needed.
|
|
bool SetupOtherL0FilesIfNeeded();
|
|
|
|
// Based on initial files, setup other files need to be compacted
|
|
// in this compaction, accordingly.
|
|
bool SetupOtherInputsIfNeeded();
|
|
|
|
Compaction* GetCompaction();
|
|
|
|
// For the specfied level, pick a file that we want to compact.
|
|
// Returns false if there is no file to compact.
|
|
// If it returns true, inputs->files.size() will be exactly one.
|
|
// If level is 0 and there is already a compaction on that level, this
|
|
// function will return false.
|
|
bool PickFileToCompact();
|
|
|
|
// For L0->L0, picks the longest span of files that aren't currently
|
|
// undergoing compaction for which work-per-deleted-file decreases. The span
|
|
// always starts from the newest L0 file.
|
|
//
|
|
// Intra-L0 compaction is independent of all other files, so it can be
|
|
// performed even when L0->base_level compactions are blocked.
|
|
//
|
|
// Returns true if `inputs` is populated with a span of files to be compacted;
|
|
// otherwise, returns false.
|
|
bool PickIntraL0Compaction();
|
|
|
|
// If there is any file marked for compaction, put put it into inputs.
|
|
void PickFilesMarkedForCompaction();
|
|
|
|
const std::string& cf_name_;
|
|
VersionStorageInfo* vstorage_;
|
|
CompactionPicker* compaction_picker_;
|
|
LogBuffer* log_buffer_;
|
|
int start_level_ = -1;
|
|
int output_level_ = -1;
|
|
int parent_index_ = -1;
|
|
int base_index_ = -1;
|
|
double start_level_score_ = 0;
|
|
bool is_manual_ = false;
|
|
CompactionInputFiles start_level_inputs_;
|
|
std::vector<CompactionInputFiles> compaction_inputs_;
|
|
CompactionInputFiles output_level_inputs_;
|
|
std::vector<FileMetaData*> grandparents_;
|
|
CompactionReason compaction_reason_ = CompactionReason::kUnknown;
|
|
|
|
const MutableCFOptions& mutable_cf_options_;
|
|
const ImmutableCFOptions& ioptions_;
|
|
// Pick a path ID to place a newly generated file, with its level
|
|
static uint32_t GetPathId(const ImmutableCFOptions& ioptions,
|
|
const MutableCFOptions& mutable_cf_options,
|
|
int level);
|
|
|
|
static const int kMinFilesForIntraL0Compaction = 4;
|
|
};
|
|
|
|
void LevelCompactionBuilder::PickFilesMarkedForCompaction() {
|
|
if (vstorage_->FilesMarkedForCompaction().empty()) {
|
|
return;
|
|
}
|
|
|
|
auto continuation = [&](std::pair<int, FileMetaData*> level_file) {
|
|
// If it's being compacted it has nothing to do here.
|
|
// If this assert() fails that means that some function marked some
|
|
// files as being_compacted, but didn't call ComputeCompactionScore()
|
|
assert(!level_file.second->being_compacted);
|
|
start_level_ = level_file.first;
|
|
output_level_ =
|
|
(start_level_ == 0) ? vstorage_->base_level() : start_level_ + 1;
|
|
|
|
if (start_level_ == 0 &&
|
|
!compaction_picker_->level0_compactions_in_progress()->empty()) {
|
|
return false;
|
|
}
|
|
|
|
start_level_inputs_.files = {level_file.second};
|
|
start_level_inputs_.level = start_level_;
|
|
return compaction_picker_->ExpandInputsToCleanCut(cf_name_, vstorage_,
|
|
&start_level_inputs_);
|
|
};
|
|
|
|
// take a chance on a random file first
|
|
Random64 rnd(/* seed */ reinterpret_cast<uint64_t>(vstorage_));
|
|
size_t random_file_index = static_cast<size_t>(rnd.Uniform(
|
|
static_cast<uint64_t>(vstorage_->FilesMarkedForCompaction().size())));
|
|
|
|
if (continuation(vstorage_->FilesMarkedForCompaction()[random_file_index])) {
|
|
// found the compaction!
|
|
return;
|
|
}
|
|
|
|
for (auto& level_file : vstorage_->FilesMarkedForCompaction()) {
|
|
if (continuation(level_file)) {
|
|
// found the compaction!
|
|
return;
|
|
}
|
|
}
|
|
start_level_inputs_.files.clear();
|
|
}
|
|
|
|
void LevelCompactionBuilder::SetupInitialFiles() {
|
|
// Find the compactions by size on all levels.
|
|
bool skipped_l0_to_base = false;
|
|
for (int i = 0; i < compaction_picker_->NumberLevels() - 1; i++) {
|
|
start_level_score_ = vstorage_->CompactionScore(i);
|
|
start_level_ = vstorage_->CompactionScoreLevel(i);
|
|
assert(i == 0 || start_level_score_ <= vstorage_->CompactionScore(i - 1));
|
|
if (start_level_score_ >= 1) {
|
|
if (skipped_l0_to_base && start_level_ == vstorage_->base_level()) {
|
|
// If L0->base_level compaction is pending, don't schedule further
|
|
// compaction from base level. Otherwise L0->base_level compaction
|
|
// may starve.
|
|
continue;
|
|
}
|
|
output_level_ =
|
|
(start_level_ == 0) ? vstorage_->base_level() : start_level_ + 1;
|
|
if (PickFileToCompact() &&
|
|
compaction_picker_->ExpandInputsToCleanCut(cf_name_, vstorage_,
|
|
&start_level_inputs_) &&
|
|
!compaction_picker_->FilesRangeOverlapWithCompaction(
|
|
{start_level_inputs_}, output_level_)) {
|
|
// found the compaction!
|
|
if (start_level_ == 0) {
|
|
// L0 score = `num L0 files` / `level0_file_num_compaction_trigger`
|
|
compaction_reason_ = CompactionReason::kLevelL0FilesNum;
|
|
} else {
|
|
// L1+ score = `Level files size` / `MaxBytesForLevel`
|
|
compaction_reason_ = CompactionReason::kLevelMaxLevelSize;
|
|
}
|
|
break;
|
|
} else {
|
|
// didn't find the compaction, clear the inputs
|
|
start_level_inputs_.clear();
|
|
if (start_level_ == 0) {
|
|
skipped_l0_to_base = true;
|
|
// L0->base_level may be blocked due to ongoing L0->base_level
|
|
// compactions. It may also be blocked by an ongoing compaction from
|
|
// base_level downwards.
|
|
//
|
|
// In these cases, to reduce L0 file count and thus reduce likelihood
|
|
// of write stalls, we can attempt compacting a span of files within
|
|
// L0.
|
|
if (PickIntraL0Compaction()) {
|
|
output_level_ = 0;
|
|
compaction_reason_ = CompactionReason::kLevelL0FilesNum;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// if we didn't find a compaction, check if there are any files marked for
|
|
// compaction
|
|
if (start_level_inputs_.empty()) {
|
|
is_manual_ = true;
|
|
parent_index_ = base_index_ = -1;
|
|
PickFilesMarkedForCompaction();
|
|
if (!start_level_inputs_.empty()) {
|
|
compaction_reason_ = CompactionReason::kFilesMarkedForCompaction;
|
|
}
|
|
}
|
|
}
|
|
|
|
bool LevelCompactionBuilder::SetupOtherL0FilesIfNeeded() {
|
|
if (start_level_ == 0 && output_level_ != 0) {
|
|
// Two level 0 compaction won't run at the same time, so don't need to worry
|
|
// about files on level 0 being compacted.
|
|
assert(compaction_picker_->level0_compactions_in_progress()->empty());
|
|
InternalKey smallest, largest;
|
|
compaction_picker_->GetRange(start_level_inputs_, &smallest, &largest);
|
|
// Note that the next call will discard the file we placed in
|
|
// c->inputs_[0] earlier and replace it with an overlapping set
|
|
// which will include the picked file.
|
|
start_level_inputs_.files.clear();
|
|
vstorage_->GetOverlappingInputs(0, &smallest, &largest,
|
|
&start_level_inputs_.files);
|
|
|
|
// If we include more L0 files in the same compaction run it can
|
|
// cause the 'smallest' and 'largest' key to get extended to a
|
|
// larger range. So, re-invoke GetRange to get the new key range
|
|
compaction_picker_->GetRange(start_level_inputs_, &smallest, &largest);
|
|
if (compaction_picker_->IsRangeInCompaction(
|
|
vstorage_, &smallest, &largest, output_level_, &parent_index_)) {
|
|
return false;
|
|
}
|
|
}
|
|
assert(!start_level_inputs_.files.empty());
|
|
|
|
return true;
|
|
}
|
|
|
|
bool LevelCompactionBuilder::SetupOtherInputsIfNeeded() {
|
|
// Setup input files from output level. For output to L0, we only compact
|
|
// spans of files that do not interact with any pending compactions, so don't
|
|
// need to consider other levels.
|
|
if (output_level_ != 0) {
|
|
output_level_inputs_.level = output_level_;
|
|
if (!compaction_picker_->SetupOtherInputs(
|
|
cf_name_, mutable_cf_options_, vstorage_, &start_level_inputs_,
|
|
&output_level_inputs_, &parent_index_, base_index_)) {
|
|
return false;
|
|
}
|
|
|
|
compaction_inputs_.push_back(start_level_inputs_);
|
|
if (!output_level_inputs_.empty()) {
|
|
compaction_inputs_.push_back(output_level_inputs_);
|
|
}
|
|
|
|
// In some edge cases we could pick a compaction that will be compacting
|
|
// a key range that overlap with another running compaction, and both
|
|
// of them have the same output level. This could happen if
|
|
// (1) we are running a non-exclusive manual compaction
|
|
// (2) AddFile ingest a new file into the LSM tree
|
|
// We need to disallow this from happening.
|
|
if (compaction_picker_->FilesRangeOverlapWithCompaction(compaction_inputs_,
|
|
output_level_)) {
|
|
// This compaction output could potentially conflict with the output
|
|
// of a currently running compaction, we cannot run it.
|
|
return false;
|
|
}
|
|
compaction_picker_->GetGrandparents(vstorage_, start_level_inputs_,
|
|
output_level_inputs_, &grandparents_);
|
|
} else {
|
|
compaction_inputs_.push_back(start_level_inputs_);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
Compaction* LevelCompactionBuilder::PickCompaction() {
|
|
// Pick up the first file to start compaction. It may have been extended
|
|
// to a clean cut.
|
|
SetupInitialFiles();
|
|
if (start_level_inputs_.empty()) {
|
|
return nullptr;
|
|
}
|
|
assert(start_level_ >= 0 && output_level_ >= 0);
|
|
|
|
// If it is a L0 -> base level compaction, we need to set up other L0
|
|
// files if needed.
|
|
if (!SetupOtherL0FilesIfNeeded()) {
|
|
return nullptr;
|
|
}
|
|
|
|
// Pick files in the output level and expand more files in the start level
|
|
// if needed.
|
|
if (!SetupOtherInputsIfNeeded()) {
|
|
return nullptr;
|
|
}
|
|
|
|
// Form a compaction object containing the files we picked.
|
|
Compaction* c = GetCompaction();
|
|
|
|
TEST_SYNC_POINT_CALLBACK("LevelCompactionPicker::PickCompaction:Return", c);
|
|
|
|
return c;
|
|
}
|
|
|
|
Compaction* LevelCompactionBuilder::GetCompaction() {
|
|
auto c = new Compaction(
|
|
vstorage_, ioptions_, mutable_cf_options_, std::move(compaction_inputs_),
|
|
output_level_, mutable_cf_options_.MaxFileSizeForLevel(output_level_),
|
|
mutable_cf_options_.max_compaction_bytes,
|
|
GetPathId(ioptions_, mutable_cf_options_, output_level_),
|
|
GetCompressionType(ioptions_, vstorage_, mutable_cf_options_,
|
|
output_level_, vstorage_->base_level()),
|
|
std::move(grandparents_), is_manual_, start_level_score_,
|
|
false /* deletion_compaction */, compaction_reason_);
|
|
|
|
// If it's level 0 compaction, make sure we don't execute any other level 0
|
|
// compactions in parallel
|
|
compaction_picker_->RegisterCompaction(c);
|
|
|
|
// Creating a compaction influences the compaction score because the score
|
|
// takes running compactions into account (by skipping files that are already
|
|
// being compacted). Since we just changed compaction score, we recalculate it
|
|
// here
|
|
vstorage_->ComputeCompactionScore(ioptions_, mutable_cf_options_);
|
|
return c;
|
|
}
|
|
|
|
/*
|
|
* Find the optimal path to place a file
|
|
* Given a level, finds the path where levels up to it will fit in levels
|
|
* up to and including this path
|
|
*/
|
|
uint32_t LevelCompactionBuilder::GetPathId(
|
|
const ImmutableCFOptions& ioptions,
|
|
const MutableCFOptions& mutable_cf_options, int level) {
|
|
uint32_t p = 0;
|
|
assert(!ioptions.db_paths.empty());
|
|
|
|
// size remaining in the most recent path
|
|
uint64_t current_path_size = ioptions.db_paths[0].target_size;
|
|
|
|
uint64_t level_size;
|
|
int cur_level = 0;
|
|
|
|
level_size = mutable_cf_options.max_bytes_for_level_base;
|
|
|
|
// Last path is the fallback
|
|
while (p < ioptions.db_paths.size() - 1) {
|
|
if (level_size <= current_path_size) {
|
|
if (cur_level == level) {
|
|
// Does desired level fit in this path?
|
|
return p;
|
|
} else {
|
|
current_path_size -= level_size;
|
|
level_size = static_cast<uint64_t>(
|
|
level_size * mutable_cf_options.max_bytes_for_level_multiplier);
|
|
cur_level++;
|
|
continue;
|
|
}
|
|
}
|
|
p++;
|
|
current_path_size = ioptions.db_paths[p].target_size;
|
|
}
|
|
return p;
|
|
}
|
|
|
|
bool LevelCompactionBuilder::PickFileToCompact() {
|
|
// level 0 files are overlapping. So we cannot pick more
|
|
// than one concurrent compactions at this level. This
|
|
// could be made better by looking at key-ranges that are
|
|
// being compacted at level 0.
|
|
if (start_level_ == 0 &&
|
|
!compaction_picker_->level0_compactions_in_progress()->empty()) {
|
|
TEST_SYNC_POINT("LevelCompactionPicker::PickCompactionBySize:0");
|
|
return false;
|
|
}
|
|
|
|
start_level_inputs_.clear();
|
|
|
|
assert(start_level_ >= 0);
|
|
|
|
// Pick the largest file in this level that is not already
|
|
// being compacted
|
|
const std::vector<int>& file_size =
|
|
vstorage_->FilesByCompactionPri(start_level_);
|
|
const std::vector<FileMetaData*>& level_files =
|
|
vstorage_->LevelFiles(start_level_);
|
|
|
|
// record the first file that is not yet compacted
|
|
int nextIndex = -1;
|
|
|
|
for (unsigned int i = vstorage_->NextCompactionIndex(start_level_);
|
|
i < file_size.size(); i++) {
|
|
int index = file_size[i];
|
|
auto* f = level_files[index];
|
|
|
|
// do not pick a file to compact if it is being compacted
|
|
// from n-1 level.
|
|
if (f->being_compacted) {
|
|
continue;
|
|
}
|
|
|
|
// remember the startIndex for the next call to PickCompaction
|
|
if (nextIndex == -1) {
|
|
nextIndex = i;
|
|
}
|
|
|
|
// Do not pick this file if its parents at level+1 are being compacted.
|
|
// Maybe we can avoid redoing this work in SetupOtherInputs
|
|
parent_index_ = -1;
|
|
if (compaction_picker_->IsRangeInCompaction(vstorage_, &f->smallest,
|
|
&f->largest, output_level_,
|
|
&parent_index_)) {
|
|
continue;
|
|
}
|
|
start_level_inputs_.files.push_back(f);
|
|
start_level_inputs_.level = start_level_;
|
|
base_index_ = index;
|
|
break;
|
|
}
|
|
|
|
// store where to start the iteration in the next call to PickCompaction
|
|
vstorage_->SetNextCompactionIndex(start_level_, nextIndex);
|
|
|
|
return start_level_inputs_.size() > 0;
|
|
}
|
|
|
|
bool LevelCompactionBuilder::PickIntraL0Compaction() {
|
|
start_level_inputs_.clear();
|
|
const std::vector<FileMetaData*>& level_files =
|
|
vstorage_->LevelFiles(0 /* level */);
|
|
if (level_files.size() <
|
|
static_cast<size_t>(
|
|
mutable_cf_options_.level0_file_num_compaction_trigger + 2) ||
|
|
level_files[0]->being_compacted) {
|
|
// If L0 isn't accumulating much files beyond the regular trigger, don't
|
|
// resort to L0->L0 compaction yet.
|
|
return false;
|
|
}
|
|
|
|
size_t compact_bytes = level_files[0]->fd.file_size;
|
|
size_t compact_bytes_per_del_file = port::kMaxSizet;
|
|
// compaction range will be [0, span_len).
|
|
size_t span_len;
|
|
// pull in files until the amount of compaction work per deleted file begins
|
|
// increasing.
|
|
for (span_len = 1; span_len < level_files.size(); ++span_len) {
|
|
compact_bytes += level_files[span_len]->fd.file_size;
|
|
size_t new_compact_bytes_per_del_file = compact_bytes / span_len;
|
|
if (level_files[span_len]->being_compacted ||
|
|
new_compact_bytes_per_del_file > compact_bytes_per_del_file) {
|
|
break;
|
|
}
|
|
compact_bytes_per_del_file = new_compact_bytes_per_del_file;
|
|
}
|
|
|
|
if (span_len >= kMinFilesForIntraL0Compaction) {
|
|
start_level_inputs_.level = 0;
|
|
for (size_t i = 0; i < span_len; ++i) {
|
|
start_level_inputs_.files.push_back(level_files[i]);
|
|
}
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
} // namespace
|
|
|
|
Compaction* LevelCompactionPicker::PickCompaction(
|
|
const std::string& cf_name, const MutableCFOptions& mutable_cf_options,
|
|
VersionStorageInfo* vstorage, LogBuffer* log_buffer) {
|
|
LevelCompactionBuilder builder(cf_name, vstorage, this, log_buffer,
|
|
mutable_cf_options, ioptions_);
|
|
return builder.PickCompaction();
|
|
}
|
|
|
|
#ifndef ROCKSDB_LITE
|
|
bool FIFOCompactionPicker::NeedsCompaction(
|
|
const VersionStorageInfo* vstorage) const {
|
|
const int kLevel0 = 0;
|
|
return vstorage->CompactionScore(kLevel0) >= 1;
|
|
}
|
|
|
|
Compaction* FIFOCompactionPicker::PickCompaction(
|
|
const std::string& cf_name, const MutableCFOptions& mutable_cf_options,
|
|
VersionStorageInfo* vstorage, LogBuffer* log_buffer) {
|
|
assert(vstorage->num_levels() == 1);
|
|
const int kLevel0 = 0;
|
|
const std::vector<FileMetaData*>& level_files = vstorage->LevelFiles(kLevel0);
|
|
uint64_t total_size = 0;
|
|
for (const auto& file : level_files) {
|
|
total_size += file->fd.file_size;
|
|
}
|
|
|
|
if (total_size <= ioptions_.compaction_options_fifo.max_table_files_size ||
|
|
level_files.size() == 0) {
|
|
// total size not exceeded
|
|
ROCKS_LOG_BUFFER(log_buffer,
|
|
"[%s] FIFO compaction: nothing to do. Total size %" PRIu64
|
|
", max size %" PRIu64 "\n",
|
|
cf_name.c_str(), total_size,
|
|
ioptions_.compaction_options_fifo.max_table_files_size);
|
|
return nullptr;
|
|
}
|
|
|
|
if (!level0_compactions_in_progress_.empty()) {
|
|
ROCKS_LOG_BUFFER(
|
|
log_buffer,
|
|
"[%s] FIFO compaction: Already executing compaction. No need "
|
|
"to run parallel compactions since compactions are very fast",
|
|
cf_name.c_str());
|
|
return nullptr;
|
|
}
|
|
|
|
std::vector<CompactionInputFiles> inputs;
|
|
inputs.emplace_back();
|
|
inputs[0].level = 0;
|
|
// delete old files (FIFO)
|
|
for (auto ritr = level_files.rbegin(); ritr != level_files.rend(); ++ritr) {
|
|
auto f = *ritr;
|
|
total_size -= f->compensated_file_size;
|
|
inputs[0].files.push_back(f);
|
|
char tmp_fsize[16];
|
|
AppendHumanBytes(f->fd.GetFileSize(), tmp_fsize, sizeof(tmp_fsize));
|
|
ROCKS_LOG_BUFFER(log_buffer, "[%s] FIFO compaction: picking file %" PRIu64
|
|
" with size %s for deletion",
|
|
cf_name.c_str(), f->fd.GetNumber(), tmp_fsize);
|
|
if (total_size <= ioptions_.compaction_options_fifo.max_table_files_size) {
|
|
break;
|
|
}
|
|
}
|
|
Compaction* c = new Compaction(
|
|
vstorage, ioptions_, mutable_cf_options, std::move(inputs), 0, 0, 0, 0,
|
|
kNoCompression, {}, /* is manual */ false, vstorage->CompactionScore(0),
|
|
/* is deletion compaction */ true, CompactionReason::kFIFOMaxSize);
|
|
RegisterCompaction(c);
|
|
return c;
|
|
}
|
|
|
|
Compaction* FIFOCompactionPicker::CompactRange(
|
|
const std::string& cf_name, const MutableCFOptions& mutable_cf_options,
|
|
VersionStorageInfo* vstorage, int input_level, int output_level,
|
|
uint32_t output_path_id, const InternalKey* begin, const InternalKey* end,
|
|
InternalKey** compaction_end, bool* manual_conflict) {
|
|
assert(input_level == 0);
|
|
assert(output_level == 0);
|
|
*compaction_end = nullptr;
|
|
LogBuffer log_buffer(InfoLogLevel::INFO_LEVEL, ioptions_.info_log);
|
|
Compaction* c =
|
|
PickCompaction(cf_name, mutable_cf_options, vstorage, &log_buffer);
|
|
log_buffer.FlushBufferToLog();
|
|
return c;
|
|
}
|
|
|
|
#endif // !ROCKSDB_LITE
|
|
|
|
} // namespace rocksdb
|