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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root 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/compaction_picker_fifo.h"
#ifndef ROCKSDB_LITE
#include <cinttypes>
#include <string>
#include <vector>
#include "db/column_family.h"
#include "logging/log_buffer.h"
#include "util/string_util.h"
namespace ROCKSDB_NAMESPACE {
namespace {
uint64_t GetTotalFilesSize(const std::vector<FileMetaData*>& files) {
uint64_t total_size = 0;
for (const auto& f : files) {
total_size += f->fd.file_size;
}
return total_size;
}
} // anonymous namespace
bool FIFOCompactionPicker::NeedsCompaction(
const VersionStorageInfo* vstorage) const {
const int kLevel0 = 0;
return vstorage->CompactionScore(kLevel0) >= 1;
}
Compaction* FIFOCompactionPicker::PickTTLCompaction(
const std::string& cf_name, const MutableCFOptions& mutable_cf_options,
VersionStorageInfo* vstorage, LogBuffer* log_buffer) {
assert(mutable_cf_options.ttl > 0);
const int kLevel0 = 0;
const std::vector<FileMetaData*>& level_files = vstorage->LevelFiles(kLevel0);
uint64_t total_size = GetTotalFilesSize(level_files);
int64_t _current_time;
auto status = ioptions_.env->GetCurrentTime(&_current_time);
if (!status.ok()) {
ROCKS_LOG_BUFFER(log_buffer,
"[%s] FIFO compaction: Couldn't get current time: %s. "
"Not doing compactions based on TTL. ",
cf_name.c_str(), status.ToString().c_str());
return nullptr;
}
const uint64_t current_time = static_cast<uint64_t>(_current_time);
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;
// avoid underflow
if (current_time > mutable_cf_options.ttl) {
for (auto ritr = level_files.rbegin(); ritr != level_files.rend(); ++ritr) {
FileMetaData* f = *ritr;
if (f->fd.table_reader && f->fd.table_reader->GetTableProperties()) {
uint64_t creation_time =
f->fd.table_reader->GetTableProperties()->creation_time;
if (creation_time == 0 ||
creation_time >= (current_time - mutable_cf_options.ttl)) {
break;
}
total_size -= f->compensated_file_size;
inputs[0].files.push_back(f);
}
}
}
// Return a nullptr and proceed to size-based FIFO compaction if:
// 1. there are no files older than ttl OR
// 2. there are a few files older than ttl, but deleting them will not bring
// the total size to be less than max_table_files_size threshold.
if (inputs[0].files.empty() ||
total_size >
mutable_cf_options.compaction_options_fifo.max_table_files_size) {
return nullptr;
}
for (const auto& f : inputs[0].files) {
uint64_t creation_time = 0;
if (f && f->fd.table_reader && f->fd.table_reader->GetTableProperties()) {
creation_time = f->fd.table_reader->GetTableProperties()->creation_time;
}
ROCKS_LOG_BUFFER(log_buffer,
"[%s] FIFO compaction: picking file %" PRIu64
" with creation time %" PRIu64 " for deletion",
cf_name.c_str(), f->fd.GetNumber(), creation_time);
}
Compaction* c = new Compaction(
vstorage, ioptions_, mutable_cf_options, std::move(inputs), 0, 0, 0, 0,
kNoCompression, ioptions_.compression_opts, /* max_subcompactions */ 0,
{}, /* is manual */ false, vstorage->CompactionScore(0),
/* is deletion compaction */ true, CompactionReason::kFIFOTtl);
return c;
}
Compaction* FIFOCompactionPicker::PickSizeCompaction(
const std::string& cf_name, const MutableCFOptions& mutable_cf_options,
VersionStorageInfo* vstorage, LogBuffer* log_buffer) {
const int kLevel0 = 0;
const std::vector<FileMetaData*>& level_files = vstorage->LevelFiles(kLevel0);
uint64_t total_size = GetTotalFilesSize(level_files);
if (total_size <=
mutable_cf_options.compaction_options_fifo.max_table_files_size ||
level_files.size() == 0) {
// total size not exceeded
if (mutable_cf_options.compaction_options_fifo.allow_compaction &&
level_files.size() > 0) {
CompactionInputFiles comp_inputs;
// try to prevent same files from being compacted multiple times, which
// could produce large files that may never TTL-expire. Achieve this by
// disallowing compactions with files larger than memtable (inflate its
// size by 10% to account for uncompressed L0 files that may have size
// slightly greater than memtable size limit).
size_t max_compact_bytes_per_del_file =
static_cast<size_t>(MultiplyCheckOverflow(
static_cast<uint64_t>(mutable_cf_options.write_buffer_size),
1.1));
if (FindIntraL0Compaction(
level_files,
mutable_cf_options
.level0_file_num_compaction_trigger /* min_files_to_compact */
,
max_compact_bytes_per_del_file,
mutable_cf_options.max_compaction_bytes, &comp_inputs)) {
Compaction* c = new Compaction(
vstorage, ioptions_, mutable_cf_options, {comp_inputs}, 0,
16 * 1024 * 1024 /* output file size limit */,
0 /* max compaction bytes, not applicable */,
0 /* output path ID */, mutable_cf_options.compression,
ioptions_.compression_opts, 0 /* max_subcompactions */, {},
/* is manual */ false, vstorage->CompactionScore(0),
/* is deletion compaction */ false,
CompactionReason::kFIFOReduceNumFiles);
return c;
}
}
ROCKS_LOG_BUFFER(
log_buffer,
"[%s] FIFO compaction: nothing to do. Total size %" PRIu64
", max size %" PRIu64 "\n",
cf_name.c_str(), total_size,
mutable_cf_options.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;
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 <=
mutable_cf_options.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, ioptions_.compression_opts, /* max_subcompactions */ 0,
{}, /* is manual */ false, vstorage->CompactionScore(0),
/* is deletion compaction */ true, CompactionReason::kFIFOMaxSize);
return c;
}
Compaction* FIFOCompactionPicker::PickCompaction(
const std::string& cf_name, const MutableCFOptions& mutable_cf_options,
VersionStorageInfo* vstorage, LogBuffer* log_buffer,
SequenceNumber /*earliest_memtable_seqno*/) {
assert(vstorage->num_levels() == 1);
Compaction* c = nullptr;
if (mutable_cf_options.ttl > 0) {
c = PickTTLCompaction(cf_name, mutable_cf_options, vstorage, log_buffer);
}
if (c == nullptr) {
c = PickSizeCompaction(cf_name, mutable_cf_options, vstorage, log_buffer);
}
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,
const CompactRangeOptions& /*compact_range_options*/,
const InternalKey* /*begin*/, const InternalKey* /*end*/,
InternalKey** compaction_end, bool* /*manual_conflict*/,
uint64_t /*max_file_num_to_ignore*/) {
#ifdef NDEBUG
(void)input_level;
(void)output_level;
#endif
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;
}
} // namespace ROCKSDB_NAMESPACE
#endif // !ROCKSDB_LITE
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