rocksdb/db/compaction.cc

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// Copyright (c) 2013, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#include "db/compaction.h"
#define __STDC_FORMAT_MACROS
#include <inttypes.h>
#include <vector>
#include "db/column_family.h"
#include "util/logging.h"
namespace rocksdb {
static uint64_t TotalFileSize(const std::vector<FileMetaData*>& files) {
uint64_t sum = 0;
for (size_t i = 0; i < files.size() && files[i]; i++) {
sum += files[i]->fd.GetFileSize();
}
return sum;
}
Compaction::Compaction(Version* input_version, int start_level, int out_level,
uint64_t target_file_size,
uint64_t max_grandparent_overlap_bytes,
uint32_t output_path_id,
CompressionType output_compression, bool seek_compaction,
bool deletion_compaction)
: start_level_(start_level),
output_level_(out_level),
max_output_file_size_(target_file_size),
max_grandparent_overlap_bytes_(max_grandparent_overlap_bytes),
input_version_(input_version),
number_levels_(input_version_->NumberLevels()),
cfd_(input_version_->cfd_),
output_path_id_(output_path_id),
output_compression_(output_compression),
seek_compaction_(seek_compaction),
deletion_compaction_(deletion_compaction),
grandparent_index_(0),
seen_key_(false),
overlapped_bytes_(0),
base_index_(-1),
parent_index_(-1),
score_(0),
bottommost_level_(false),
is_full_compaction_(false),
is_manual_compaction_(false),
level_ptrs_(std::vector<size_t>(number_levels_)) {
cfd_->Ref();
input_version_->Ref();
edit_ = new VersionEdit();
edit_->SetColumnFamily(cfd_->GetID());
for (int i = 0; i < number_levels_; i++) {
level_ptrs_[i] = 0;
}
int num_levels = output_level_ - start_level_ + 1;
input_levels_.resize(num_levels);
inputs_.resize(num_levels);
for (int i = 0; i < num_levels; ++i) {
inputs_[i].level = start_level_ + i;
}
}
Compaction::~Compaction() {
delete edit_;
if (input_version_ != nullptr) {
input_version_->Unref();
}
if (cfd_ != nullptr) {
if (cfd_->Unref()) {
delete cfd_;
}
}
}
void Compaction::GenerateFileLevels() {
input_levels_.resize(num_input_levels());
for (int which = 0; which < num_input_levels(); which++) {
DoGenerateFileLevel(&input_levels_[which], inputs_[which].files, &arena_);
}
}
bool Compaction::IsTrivialMove() const {
// Avoid a move if there is lots of overlapping grandparent data.
// Otherwise, the move could create a parent file that will require
// a very expensive merge later on.
// If start_level_== output_level_, the purpose is to force compaction
// filter to be applied to that level, and thus cannot be a trivia move.
return (start_level_ != output_level_ &&
num_input_levels() == 2 &&
num_input_files(0) == 1 &&
num_input_files(1) == 0 &&
TotalFileSize(grandparents_) <= max_grandparent_overlap_bytes_);
}
void Compaction::AddInputDeletions(VersionEdit* edit) {
for (int which = 0; which < num_input_levels(); which++) {
for (size_t i = 0; i < inputs_[which].size(); i++) {
edit->DeleteFile(level(which), inputs_[which][i]->fd.GetNumber());
}
}
}
bool Compaction::KeyNotExistsBeyondOutputLevel(const Slice& user_key) {
assert(cfd_->options()->compaction_style != kCompactionStyleFIFO);
if (cfd_->options()->compaction_style == kCompactionStyleUniversal) {
return bottommost_level_;
}
// Maybe use binary search to find right entry instead of linear search?
const Comparator* user_cmp = cfd_->user_comparator();
for (int lvl = output_level_ + 1; lvl < number_levels_; lvl++) {
const std::vector<FileMetaData*>& files = input_version_->files_[lvl];
for (; level_ptrs_[lvl] < files.size(); ) {
FileMetaData* f = files[level_ptrs_[lvl]];
if (user_cmp->Compare(user_key, f->largest.user_key()) <= 0) {
// We've advanced far enough
if (user_cmp->Compare(user_key, f->smallest.user_key()) >= 0) {
// Key falls in this file's range, so definitely
// exists beyond output level
return false;
}
break;
}
level_ptrs_[lvl]++;
}
}
return true;
}
bool Compaction::ShouldStopBefore(const Slice& internal_key) {
// Scan to find earliest grandparent file that contains key.
const InternalKeyComparator* icmp = &cfd_->internal_comparator();
while (grandparent_index_ < grandparents_.size() &&
icmp->Compare(internal_key,
grandparents_[grandparent_index_]->largest.Encode()) > 0) {
if (seen_key_) {
overlapped_bytes_ += grandparents_[grandparent_index_]->fd.GetFileSize();
}
assert(grandparent_index_ + 1 >= grandparents_.size() ||
icmp->Compare(grandparents_[grandparent_index_]->largest.Encode(),
grandparents_[grandparent_index_+1]->smallest.Encode())
< 0);
grandparent_index_++;
}
seen_key_ = true;
if (overlapped_bytes_ > max_grandparent_overlap_bytes_) {
// Too much overlap for current output; start new output
overlapped_bytes_ = 0;
return true;
} else {
return false;
}
}
// Mark (or clear) each file that is being compacted
void Compaction::MarkFilesBeingCompacted(bool mark_as_compacted) {
for (int i = 0; i < num_input_levels(); i++) {
for (unsigned int j = 0; j < inputs_[i].size(); j++) {
assert(mark_as_compacted ? !inputs_[i][j]->being_compacted :
inputs_[i][j]->being_compacted);
inputs_[i][j]->being_compacted = mark_as_compacted;
}
}
}
// Is this compaction producing files at the bottommost level?
void Compaction::SetupBottomMostLevel(bool is_manual) {
assert(cfd_->options()->compaction_style != kCompactionStyleFIFO);
if (cfd_->options()->compaction_style == kCompactionStyleUniversal) {
// If universal compaction style is used and manual
// compaction is occuring, then we are guaranteed that
// all files will be picked in a single compaction
// run. We can safely set bottommost_level_ = true.
// If it is not manual compaction, then bottommost_level_
// is already set when the Compaction was created.
if (is_manual) {
bottommost_level_ = true;
}
return;
}
bottommost_level_ = true;
// checks whether there are files living beyond the output_level.
for (int i = output_level_ + 1; i < number_levels_; i++) {
if (input_version_->NumLevelFiles(i) > 0) {
bottommost_level_ = false;
break;
}
}
}
void Compaction::ReleaseInputs() {
if (input_version_ != nullptr) {
input_version_->Unref();
input_version_ = nullptr;
}
if (cfd_ != nullptr) {
if (cfd_->Unref()) {
delete cfd_;
}
cfd_ = nullptr;
}
}
void Compaction::ReleaseCompactionFiles(Status status) {
cfd_->compaction_picker()->ReleaseCompactionFiles(this, status);
}
void Compaction::ResetNextCompactionIndex() {
input_version_->ResetNextCompactionIndex(start_level_);
}
namespace {
int InputSummary(const std::vector<FileMetaData*>& files, char* output,
int len) {
*output = '\0';
int write = 0;
for (unsigned int i = 0; i < files.size(); i++) {
int sz = len - write;
int ret;
char sztxt[16];
AppendHumanBytes(files.at(i)->fd.GetFileSize(), sztxt, 16);
ret = snprintf(output + write, sz, "%" PRIu64 "(%s) ",
files.at(i)->fd.GetNumber(), sztxt);
if (ret < 0 || ret >= sz) break;
write += ret;
}
// if files.size() is non-zero, overwrite the last space
return write - !!files.size();
}
} // namespace
void Compaction::Summary(char* output, int len) {
int write =
snprintf(output, len, "Base version %" PRIu64
" Base level %d, seek compaction:%d, inputs: [",
input_version_->GetVersionNumber(),
start_level_, seek_compaction_);
if (write < 0 || write >= len) {
return;
}
for (int level = 0; level < num_input_levels(); ++level) {
if (level > 0) {
write += snprintf(output + write, len - write, "], [");
if (write < 0 || write >= len) {
return;
}
}
write += InputSummary(inputs_[level].files, output + write, len - write);
if (write < 0 || write >= len) {
return;
}
}
snprintf(output + write, len - write, "]");
}
uint64_t Compaction::OutputFilePreallocationSize() {
uint64_t preallocation_size = 0;
if (cfd_->options()->compaction_style == kCompactionStyleLevel) {
preallocation_size =
cfd_->compaction_picker()->MaxFileSizeForLevel(output_level());
} else {
for (int level = 0; level < num_input_levels(); ++level) {
for (const auto& f : inputs_[level].files) {
preallocation_size += f->fd.GetFileSize();
}
}
}
// Over-estimate slightly so we don't end up just barely crossing
// the threshold
return preallocation_size * 1.1;
}
} // namespace rocksdb