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506e8448be
Summary: Part of compaction cpu goes to processing snapshot list, the larger the list the bigger the overhead. Although the lifetime of most of the snapshots is much shorter than the lifetime of compactions, the compaction conservatively operates on the list of snapshots that it initially obtained. This patch allows the snapshot list to be updated via a callback if the compaction is taking long. This should let the compaction to continue more efficiently with much smaller snapshot list. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5099 Differential Revision: D15086710 Pulled By: maysamyabandeh fbshipit-source-id: 7649f56c3b6b2fb334962048150142a3bf9c1a12
621 lines
25 KiB
C++
621 lines
25 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 "rocksdb/options.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 "monitoring/statistics.h"
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#include "options/db_options.h"
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#include "options/options_helper.h"
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#include "rocksdb/cache.h"
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#include "rocksdb/compaction_filter.h"
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#include "rocksdb/comparator.h"
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#include "rocksdb/env.h"
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#include "rocksdb/memtablerep.h"
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#include "rocksdb/merge_operator.h"
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#include "rocksdb/slice.h"
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#include "rocksdb/slice_transform.h"
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#include "rocksdb/sst_file_manager.h"
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#include "rocksdb/table.h"
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#include "rocksdb/table_properties.h"
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#include "rocksdb/wal_filter.h"
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#include "table/block_based_table_factory.h"
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#include "util/compression.h"
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namespace rocksdb {
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AdvancedColumnFamilyOptions::AdvancedColumnFamilyOptions() {
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assert(memtable_factory.get() != nullptr);
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}
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AdvancedColumnFamilyOptions::AdvancedColumnFamilyOptions(const Options& options)
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: max_write_buffer_number(options.max_write_buffer_number),
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min_write_buffer_number_to_merge(
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options.min_write_buffer_number_to_merge),
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max_write_buffer_number_to_maintain(
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options.max_write_buffer_number_to_maintain),
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inplace_update_support(options.inplace_update_support),
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inplace_update_num_locks(options.inplace_update_num_locks),
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inplace_callback(options.inplace_callback),
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memtable_prefix_bloom_size_ratio(
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options.memtable_prefix_bloom_size_ratio),
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memtable_whole_key_filtering(options.memtable_whole_key_filtering),
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memtable_huge_page_size(options.memtable_huge_page_size),
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memtable_insert_with_hint_prefix_extractor(
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options.memtable_insert_with_hint_prefix_extractor),
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bloom_locality(options.bloom_locality),
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arena_block_size(options.arena_block_size),
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compression_per_level(options.compression_per_level),
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num_levels(options.num_levels),
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level0_slowdown_writes_trigger(options.level0_slowdown_writes_trigger),
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level0_stop_writes_trigger(options.level0_stop_writes_trigger),
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target_file_size_base(options.target_file_size_base),
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target_file_size_multiplier(options.target_file_size_multiplier),
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level_compaction_dynamic_level_bytes(
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options.level_compaction_dynamic_level_bytes),
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max_bytes_for_level_multiplier(options.max_bytes_for_level_multiplier),
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max_bytes_for_level_multiplier_additional(
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options.max_bytes_for_level_multiplier_additional),
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max_compaction_bytes(options.max_compaction_bytes),
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soft_pending_compaction_bytes_limit(
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options.soft_pending_compaction_bytes_limit),
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hard_pending_compaction_bytes_limit(
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options.hard_pending_compaction_bytes_limit),
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compaction_style(options.compaction_style),
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compaction_pri(options.compaction_pri),
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compaction_options_universal(options.compaction_options_universal),
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compaction_options_fifo(options.compaction_options_fifo),
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max_sequential_skip_in_iterations(
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options.max_sequential_skip_in_iterations),
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memtable_factory(options.memtable_factory),
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table_properties_collector_factories(
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options.table_properties_collector_factories),
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max_successive_merges(options.max_successive_merges),
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optimize_filters_for_hits(options.optimize_filters_for_hits),
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paranoid_file_checks(options.paranoid_file_checks),
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force_consistency_checks(options.force_consistency_checks),
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report_bg_io_stats(options.report_bg_io_stats),
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ttl(options.ttl),
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periodic_compaction_seconds(options.periodic_compaction_seconds),
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sample_for_compression(options.sample_for_compression) {
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assert(memtable_factory.get() != nullptr);
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if (max_bytes_for_level_multiplier_additional.size() <
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static_cast<unsigned int>(num_levels)) {
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max_bytes_for_level_multiplier_additional.resize(num_levels, 1);
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}
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}
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ColumnFamilyOptions::ColumnFamilyOptions()
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: compression(Snappy_Supported() ? kSnappyCompression : kNoCompression),
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table_factory(
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std::shared_ptr<TableFactory>(new BlockBasedTableFactory())) {}
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ColumnFamilyOptions::ColumnFamilyOptions(const Options& options)
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: ColumnFamilyOptions(*static_cast<const ColumnFamilyOptions*>(&options)) {}
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DBOptions::DBOptions() {}
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DBOptions::DBOptions(const Options& options)
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: DBOptions(*static_cast<const DBOptions*>(&options)) {}
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void DBOptions::Dump(Logger* log) const {
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ImmutableDBOptions(*this).Dump(log);
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MutableDBOptions(*this).Dump(log);
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} // DBOptions::Dump
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void ColumnFamilyOptions::Dump(Logger* log) const {
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ROCKS_LOG_HEADER(log, " Options.comparator: %s",
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comparator->Name());
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ROCKS_LOG_HEADER(log, " Options.merge_operator: %s",
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merge_operator ? merge_operator->Name() : "None");
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ROCKS_LOG_HEADER(log, " Options.compaction_filter: %s",
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compaction_filter ? compaction_filter->Name() : "None");
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ROCKS_LOG_HEADER(
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log, " Options.compaction_filter_factory: %s",
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compaction_filter_factory ? compaction_filter_factory->Name() : "None");
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ROCKS_LOG_HEADER(log, " Options.memtable_factory: %s",
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memtable_factory->Name());
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ROCKS_LOG_HEADER(log, " Options.table_factory: %s",
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table_factory->Name());
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ROCKS_LOG_HEADER(log, " table_factory options: %s",
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table_factory->GetPrintableTableOptions().c_str());
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ROCKS_LOG_HEADER(log, " Options.write_buffer_size: %" ROCKSDB_PRIszt,
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write_buffer_size);
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ROCKS_LOG_HEADER(log, " Options.max_write_buffer_number: %d",
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max_write_buffer_number);
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if (!compression_per_level.empty()) {
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for (unsigned int i = 0; i < compression_per_level.size(); i++) {
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ROCKS_LOG_HEADER(
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log, " Options.compression[%d]: %s", i,
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CompressionTypeToString(compression_per_level[i]).c_str());
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}
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} else {
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ROCKS_LOG_HEADER(log, " Options.compression: %s",
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CompressionTypeToString(compression).c_str());
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}
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ROCKS_LOG_HEADER(
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log, " Options.bottommost_compression: %s",
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bottommost_compression == kDisableCompressionOption
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? "Disabled"
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: CompressionTypeToString(bottommost_compression).c_str());
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ROCKS_LOG_HEADER(
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log, " Options.prefix_extractor: %s",
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prefix_extractor == nullptr ? "nullptr" : prefix_extractor->Name());
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ROCKS_LOG_HEADER(log,
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" Options.memtable_insert_with_hint_prefix_extractor: %s",
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memtable_insert_with_hint_prefix_extractor == nullptr
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? "nullptr"
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: memtable_insert_with_hint_prefix_extractor->Name());
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ROCKS_LOG_HEADER(log, " Options.num_levels: %d", num_levels);
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ROCKS_LOG_HEADER(log, " Options.min_write_buffer_number_to_merge: %d",
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min_write_buffer_number_to_merge);
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ROCKS_LOG_HEADER(log, " Options.max_write_buffer_number_to_maintain: %d",
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max_write_buffer_number_to_maintain);
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ROCKS_LOG_HEADER(
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log, " Options.bottommost_compression_opts.window_bits: %d",
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bottommost_compression_opts.window_bits);
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ROCKS_LOG_HEADER(
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log, " Options.bottommost_compression_opts.level: %d",
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bottommost_compression_opts.level);
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ROCKS_LOG_HEADER(
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log, " Options.bottommost_compression_opts.strategy: %d",
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bottommost_compression_opts.strategy);
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ROCKS_LOG_HEADER(
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log,
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" Options.bottommost_compression_opts.max_dict_bytes: "
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"%" PRIu32,
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bottommost_compression_opts.max_dict_bytes);
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ROCKS_LOG_HEADER(
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log,
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" Options.bottommost_compression_opts.zstd_max_train_bytes: "
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"%" PRIu32,
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bottommost_compression_opts.zstd_max_train_bytes);
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ROCKS_LOG_HEADER(
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log, " Options.bottommost_compression_opts.enabled: %s",
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bottommost_compression_opts.enabled ? "true" : "false");
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ROCKS_LOG_HEADER(log, " Options.compression_opts.window_bits: %d",
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compression_opts.window_bits);
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ROCKS_LOG_HEADER(log, " Options.compression_opts.level: %d",
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compression_opts.level);
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ROCKS_LOG_HEADER(log, " Options.compression_opts.strategy: %d",
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compression_opts.strategy);
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ROCKS_LOG_HEADER(
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log,
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" Options.compression_opts.max_dict_bytes: %" PRIu32,
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compression_opts.max_dict_bytes);
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ROCKS_LOG_HEADER(log,
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" Options.compression_opts.zstd_max_train_bytes: "
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"%" PRIu32,
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compression_opts.zstd_max_train_bytes);
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ROCKS_LOG_HEADER(log,
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" Options.compression_opts.enabled: %s",
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compression_opts.enabled ? "true" : "false");
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ROCKS_LOG_HEADER(log, " Options.level0_file_num_compaction_trigger: %d",
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level0_file_num_compaction_trigger);
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ROCKS_LOG_HEADER(log, " Options.level0_slowdown_writes_trigger: %d",
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level0_slowdown_writes_trigger);
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ROCKS_LOG_HEADER(log, " Options.level0_stop_writes_trigger: %d",
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level0_stop_writes_trigger);
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ROCKS_LOG_HEADER(
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log, " Options.target_file_size_base: %" PRIu64,
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target_file_size_base);
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ROCKS_LOG_HEADER(log, " Options.target_file_size_multiplier: %d",
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target_file_size_multiplier);
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ROCKS_LOG_HEADER(
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log, " Options.max_bytes_for_level_base: %" PRIu64,
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max_bytes_for_level_base);
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ROCKS_LOG_HEADER(
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log, " Options.snap_refresh_nanos: %" PRIu64,
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snap_refresh_nanos);
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ROCKS_LOG_HEADER(log, "Options.level_compaction_dynamic_level_bytes: %d",
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level_compaction_dynamic_level_bytes);
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ROCKS_LOG_HEADER(log, " Options.max_bytes_for_level_multiplier: %f",
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max_bytes_for_level_multiplier);
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for (size_t i = 0; i < max_bytes_for_level_multiplier_additional.size();
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i++) {
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ROCKS_LOG_HEADER(
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log, "Options.max_bytes_for_level_multiplier_addtl[%" ROCKSDB_PRIszt
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"]: %d",
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i, max_bytes_for_level_multiplier_additional[i]);
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}
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ROCKS_LOG_HEADER(
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log, " Options.max_sequential_skip_in_iterations: %" PRIu64,
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max_sequential_skip_in_iterations);
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ROCKS_LOG_HEADER(
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log, " Options.max_compaction_bytes: %" PRIu64,
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max_compaction_bytes);
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ROCKS_LOG_HEADER(
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log,
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" Options.arena_block_size: %" ROCKSDB_PRIszt,
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arena_block_size);
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ROCKS_LOG_HEADER(log,
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" Options.soft_pending_compaction_bytes_limit: %" PRIu64,
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soft_pending_compaction_bytes_limit);
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ROCKS_LOG_HEADER(log,
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" Options.hard_pending_compaction_bytes_limit: %" PRIu64,
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hard_pending_compaction_bytes_limit);
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ROCKS_LOG_HEADER(log, " Options.rate_limit_delay_max_milliseconds: %u",
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rate_limit_delay_max_milliseconds);
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ROCKS_LOG_HEADER(log, " Options.disable_auto_compactions: %d",
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disable_auto_compactions);
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const auto& it_compaction_style =
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compaction_style_to_string.find(compaction_style);
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std::string str_compaction_style;
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if (it_compaction_style == compaction_style_to_string.end()) {
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assert(false);
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str_compaction_style = "unknown_" + std::to_string(compaction_style);
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} else {
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str_compaction_style = it_compaction_style->second;
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}
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ROCKS_LOG_HEADER(log,
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" Options.compaction_style: %s",
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str_compaction_style.c_str());
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const auto& it_compaction_pri =
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compaction_pri_to_string.find(compaction_pri);
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std::string str_compaction_pri;
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if (it_compaction_pri == compaction_pri_to_string.end()) {
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assert(false);
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str_compaction_pri = "unknown_" + std::to_string(compaction_pri);
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} else {
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str_compaction_pri = it_compaction_pri->second;
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}
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ROCKS_LOG_HEADER(log,
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" Options.compaction_pri: %s",
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str_compaction_pri.c_str());
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ROCKS_LOG_HEADER(log,
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"Options.compaction_options_universal.size_ratio: %u",
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compaction_options_universal.size_ratio);
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ROCKS_LOG_HEADER(log,
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"Options.compaction_options_universal.min_merge_width: %u",
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compaction_options_universal.min_merge_width);
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ROCKS_LOG_HEADER(log,
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"Options.compaction_options_universal.max_merge_width: %u",
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compaction_options_universal.max_merge_width);
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ROCKS_LOG_HEADER(
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log,
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"Options.compaction_options_universal."
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"max_size_amplification_percent: %u",
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compaction_options_universal.max_size_amplification_percent);
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ROCKS_LOG_HEADER(
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log,
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"Options.compaction_options_universal.compression_size_percent: %d",
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compaction_options_universal.compression_size_percent);
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const auto& it_compaction_stop_style = compaction_stop_style_to_string.find(
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compaction_options_universal.stop_style);
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std::string str_compaction_stop_style;
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if (it_compaction_stop_style == compaction_stop_style_to_string.end()) {
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assert(false);
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str_compaction_stop_style =
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"unknown_" + std::to_string(compaction_options_universal.stop_style);
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} else {
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str_compaction_stop_style = it_compaction_stop_style->second;
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}
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ROCKS_LOG_HEADER(log,
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"Options.compaction_options_universal.stop_style: %s",
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str_compaction_stop_style.c_str());
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ROCKS_LOG_HEADER(
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log, "Options.compaction_options_fifo.max_table_files_size: %" PRIu64,
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compaction_options_fifo.max_table_files_size);
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ROCKS_LOG_HEADER(log,
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"Options.compaction_options_fifo.allow_compaction: %d",
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compaction_options_fifo.allow_compaction);
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std::string collector_names;
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for (const auto& collector_factory : table_properties_collector_factories) {
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collector_names.append(collector_factory->Name());
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collector_names.append("; ");
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}
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ROCKS_LOG_HEADER(
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log, " Options.table_properties_collectors: %s",
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collector_names.c_str());
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ROCKS_LOG_HEADER(log,
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" Options.inplace_update_support: %d",
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inplace_update_support);
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ROCKS_LOG_HEADER(
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log,
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" Options.inplace_update_num_locks: %" ROCKSDB_PRIszt,
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inplace_update_num_locks);
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// TODO: easier config for bloom (maybe based on avg key/value size)
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ROCKS_LOG_HEADER(
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log, " Options.memtable_prefix_bloom_size_ratio: %f",
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memtable_prefix_bloom_size_ratio);
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ROCKS_LOG_HEADER(log,
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" Options.memtable_whole_key_filtering: %d",
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memtable_whole_key_filtering);
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ROCKS_LOG_HEADER(log, " Options.memtable_huge_page_size: %" ROCKSDB_PRIszt,
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memtable_huge_page_size);
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ROCKS_LOG_HEADER(log,
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" Options.bloom_locality: %d",
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bloom_locality);
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ROCKS_LOG_HEADER(
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log,
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" Options.max_successive_merges: %" ROCKSDB_PRIszt,
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max_successive_merges);
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ROCKS_LOG_HEADER(log,
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" Options.optimize_filters_for_hits: %d",
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optimize_filters_for_hits);
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ROCKS_LOG_HEADER(log, " Options.paranoid_file_checks: %d",
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paranoid_file_checks);
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ROCKS_LOG_HEADER(log, " Options.force_consistency_checks: %d",
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force_consistency_checks);
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ROCKS_LOG_HEADER(log, " Options.report_bg_io_stats: %d",
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report_bg_io_stats);
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ROCKS_LOG_HEADER(log, " Options.ttl: %" PRIu64,
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ttl);
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ROCKS_LOG_HEADER(log,
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" Options.periodic_compaction_seconds: %" PRIu64,
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periodic_compaction_seconds);
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} // ColumnFamilyOptions::Dump
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void Options::Dump(Logger* log) const {
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DBOptions::Dump(log);
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ColumnFamilyOptions::Dump(log);
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} // Options::Dump
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void Options::DumpCFOptions(Logger* log) const {
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ColumnFamilyOptions::Dump(log);
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} // Options::DumpCFOptions
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//
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// The goal of this method is to create a configuration that
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// allows an application to write all files into L0 and
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// then do a single compaction to output all files into L1.
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Options*
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Options::PrepareForBulkLoad()
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{
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// never slowdown ingest.
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level0_file_num_compaction_trigger = (1<<30);
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level0_slowdown_writes_trigger = (1<<30);
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level0_stop_writes_trigger = (1<<30);
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soft_pending_compaction_bytes_limit = 0;
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hard_pending_compaction_bytes_limit = 0;
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// no auto compactions please. The application should issue a
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// manual compaction after all data is loaded into L0.
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disable_auto_compactions = true;
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// A manual compaction run should pick all files in L0 in
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// a single compaction run.
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max_compaction_bytes = (static_cast<uint64_t>(1) << 60);
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|
|
|
// It is better to have only 2 levels, otherwise a manual
|
|
// compaction would compact at every possible level, thereby
|
|
// increasing the total time needed for compactions.
|
|
num_levels = 2;
|
|
|
|
// Need to allow more write buffers to allow more parallism
|
|
// of flushes.
|
|
max_write_buffer_number = 6;
|
|
min_write_buffer_number_to_merge = 1;
|
|
|
|
// When compaction is disabled, more parallel flush threads can
|
|
// help with write throughput.
|
|
max_background_flushes = 4;
|
|
|
|
// Prevent a memtable flush to automatically promote files
|
|
// to L1. This is helpful so that all files that are
|
|
// input to the manual compaction are all at L0.
|
|
max_background_compactions = 2;
|
|
|
|
// The compaction would create large files in L1.
|
|
target_file_size_base = 256 * 1024 * 1024;
|
|
return this;
|
|
}
|
|
|
|
Options* Options::OptimizeForSmallDb() {
|
|
// 16MB block cache
|
|
std::shared_ptr<Cache> cache = NewLRUCache(16 << 20);
|
|
|
|
ColumnFamilyOptions::OptimizeForSmallDb(&cache);
|
|
DBOptions::OptimizeForSmallDb(&cache);
|
|
return this;
|
|
}
|
|
|
|
Options* Options::OldDefaults(int rocksdb_major_version,
|
|
int rocksdb_minor_version) {
|
|
ColumnFamilyOptions::OldDefaults(rocksdb_major_version,
|
|
rocksdb_minor_version);
|
|
DBOptions::OldDefaults(rocksdb_major_version, rocksdb_minor_version);
|
|
return this;
|
|
}
|
|
|
|
DBOptions* DBOptions::OldDefaults(int rocksdb_major_version,
|
|
int rocksdb_minor_version) {
|
|
if (rocksdb_major_version < 4 ||
|
|
(rocksdb_major_version == 4 && rocksdb_minor_version < 7)) {
|
|
max_file_opening_threads = 1;
|
|
table_cache_numshardbits = 4;
|
|
}
|
|
if (rocksdb_major_version < 5 ||
|
|
(rocksdb_major_version == 5 && rocksdb_minor_version < 2)) {
|
|
delayed_write_rate = 2 * 1024U * 1024U;
|
|
} else if (rocksdb_major_version < 5 ||
|
|
(rocksdb_major_version == 5 && rocksdb_minor_version < 6)) {
|
|
delayed_write_rate = 16 * 1024U * 1024U;
|
|
}
|
|
max_open_files = 5000;
|
|
wal_recovery_mode = WALRecoveryMode::kTolerateCorruptedTailRecords;
|
|
return this;
|
|
}
|
|
|
|
ColumnFamilyOptions* ColumnFamilyOptions::OldDefaults(
|
|
int rocksdb_major_version, int rocksdb_minor_version) {
|
|
if (rocksdb_major_version < 5 ||
|
|
(rocksdb_major_version == 5 && rocksdb_minor_version <= 18)) {
|
|
compaction_pri = CompactionPri::kByCompensatedSize;
|
|
}
|
|
if (rocksdb_major_version < 4 ||
|
|
(rocksdb_major_version == 4 && rocksdb_minor_version < 7)) {
|
|
write_buffer_size = 4 << 20;
|
|
target_file_size_base = 2 * 1048576;
|
|
max_bytes_for_level_base = 10 * 1048576;
|
|
soft_pending_compaction_bytes_limit = 0;
|
|
hard_pending_compaction_bytes_limit = 0;
|
|
}
|
|
if (rocksdb_major_version < 5) {
|
|
level0_stop_writes_trigger = 24;
|
|
} else if (rocksdb_major_version == 5 && rocksdb_minor_version < 2) {
|
|
level0_stop_writes_trigger = 30;
|
|
}
|
|
|
|
return this;
|
|
}
|
|
|
|
// Optimization functions
|
|
DBOptions* DBOptions::OptimizeForSmallDb(std::shared_ptr<Cache>* cache) {
|
|
max_file_opening_threads = 1;
|
|
max_open_files = 5000;
|
|
|
|
// Cost memtable to block cache too.
|
|
std::shared_ptr<rocksdb::WriteBufferManager> wbm =
|
|
std::make_shared<rocksdb::WriteBufferManager>(
|
|
0, (cache != nullptr) ? *cache : std::shared_ptr<Cache>());
|
|
write_buffer_manager = wbm;
|
|
|
|
return this;
|
|
}
|
|
|
|
ColumnFamilyOptions* ColumnFamilyOptions::OptimizeForSmallDb(
|
|
std::shared_ptr<Cache>* cache) {
|
|
write_buffer_size = 2 << 20;
|
|
target_file_size_base = 2 * 1048576;
|
|
max_bytes_for_level_base = 10 * 1048576;
|
|
snap_refresh_nanos = 0;
|
|
soft_pending_compaction_bytes_limit = 256 * 1048576;
|
|
hard_pending_compaction_bytes_limit = 1073741824ul;
|
|
|
|
BlockBasedTableOptions table_options;
|
|
table_options.block_cache =
|
|
(cache != nullptr) ? *cache : std::shared_ptr<Cache>();
|
|
table_options.cache_index_and_filter_blocks = true;
|
|
// Two level iterator to avoid LRU cache imbalance
|
|
table_options.index_type =
|
|
BlockBasedTableOptions::IndexType::kTwoLevelIndexSearch;
|
|
table_factory.reset(new BlockBasedTableFactory(table_options));
|
|
|
|
|
|
return this;
|
|
}
|
|
|
|
#ifndef ROCKSDB_LITE
|
|
ColumnFamilyOptions* ColumnFamilyOptions::OptimizeForPointLookup(
|
|
uint64_t block_cache_size_mb) {
|
|
BlockBasedTableOptions block_based_options;
|
|
block_based_options.data_block_index_type =
|
|
BlockBasedTableOptions::kDataBlockBinaryAndHash;
|
|
block_based_options.data_block_hash_table_util_ratio = 0.75;
|
|
block_based_options.filter_policy.reset(NewBloomFilterPolicy(10));
|
|
block_based_options.block_cache =
|
|
NewLRUCache(static_cast<size_t>(block_cache_size_mb * 1024 * 1024));
|
|
table_factory.reset(new BlockBasedTableFactory(block_based_options));
|
|
memtable_prefix_bloom_size_ratio = 0.02;
|
|
memtable_whole_key_filtering = true;
|
|
return this;
|
|
}
|
|
|
|
ColumnFamilyOptions* ColumnFamilyOptions::OptimizeLevelStyleCompaction(
|
|
uint64_t memtable_memory_budget) {
|
|
write_buffer_size = static_cast<size_t>(memtable_memory_budget / 4);
|
|
// merge two memtables when flushing to L0
|
|
min_write_buffer_number_to_merge = 2;
|
|
// this means we'll use 50% extra memory in the worst case, but will reduce
|
|
// write stalls.
|
|
max_write_buffer_number = 6;
|
|
// start flushing L0->L1 as soon as possible. each file on level0 is
|
|
// (memtable_memory_budget / 2). This will flush level 0 when it's bigger than
|
|
// memtable_memory_budget.
|
|
level0_file_num_compaction_trigger = 2;
|
|
// doesn't really matter much, but we don't want to create too many files
|
|
target_file_size_base = memtable_memory_budget / 8;
|
|
// make Level1 size equal to Level0 size, so that L0->L1 compactions are fast
|
|
max_bytes_for_level_base = memtable_memory_budget;
|
|
|
|
// level style compaction
|
|
compaction_style = kCompactionStyleLevel;
|
|
|
|
// only compress levels >= 2
|
|
compression_per_level.resize(num_levels);
|
|
for (int i = 0; i < num_levels; ++i) {
|
|
if (i < 2) {
|
|
compression_per_level[i] = kNoCompression;
|
|
} else {
|
|
compression_per_level[i] = kSnappyCompression;
|
|
}
|
|
}
|
|
return this;
|
|
}
|
|
|
|
ColumnFamilyOptions* ColumnFamilyOptions::OptimizeUniversalStyleCompaction(
|
|
uint64_t memtable_memory_budget) {
|
|
write_buffer_size = static_cast<size_t>(memtable_memory_budget / 4);
|
|
// merge two memtables when flushing to L0
|
|
min_write_buffer_number_to_merge = 2;
|
|
// this means we'll use 50% extra memory in the worst case, but will reduce
|
|
// write stalls.
|
|
max_write_buffer_number = 6;
|
|
// universal style compaction
|
|
compaction_style = kCompactionStyleUniversal;
|
|
compaction_options_universal.compression_size_percent = 80;
|
|
return this;
|
|
}
|
|
|
|
DBOptions* DBOptions::IncreaseParallelism(int total_threads) {
|
|
max_background_jobs = total_threads;
|
|
env->SetBackgroundThreads(total_threads, Env::LOW);
|
|
env->SetBackgroundThreads(1, Env::HIGH);
|
|
return this;
|
|
}
|
|
|
|
#endif // !ROCKSDB_LITE
|
|
|
|
ReadOptions::ReadOptions()
|
|
: snapshot(nullptr),
|
|
iterate_lower_bound(nullptr),
|
|
iterate_upper_bound(nullptr),
|
|
readahead_size(0),
|
|
max_skippable_internal_keys(0),
|
|
read_tier(kReadAllTier),
|
|
verify_checksums(true),
|
|
fill_cache(true),
|
|
tailing(false),
|
|
managed(false),
|
|
total_order_seek(false),
|
|
prefix_same_as_start(false),
|
|
pin_data(false),
|
|
background_purge_on_iterator_cleanup(false),
|
|
ignore_range_deletions(false),
|
|
iter_start_seqnum(0) {}
|
|
|
|
ReadOptions::ReadOptions(bool cksum, bool cache)
|
|
: snapshot(nullptr),
|
|
iterate_lower_bound(nullptr),
|
|
iterate_upper_bound(nullptr),
|
|
readahead_size(0),
|
|
max_skippable_internal_keys(0),
|
|
read_tier(kReadAllTier),
|
|
verify_checksums(cksum),
|
|
fill_cache(cache),
|
|
tailing(false),
|
|
managed(false),
|
|
total_order_seek(false),
|
|
prefix_same_as_start(false),
|
|
pin_data(false),
|
|
background_purge_on_iterator_cleanup(false),
|
|
ignore_range_deletions(false),
|
|
iter_start_seqnum(0) {}
|
|
|
|
} // namespace rocksdb
|