26f5dd9a5a
Summary: This diff addresses task #4296714 and rethinks how users provide us with TablePropertiesCollectors as part of Options. Here's description of task #4296714: I'm debugging #4295529 and noticed that our count of user properties kDeletedKeys is wrong. We're sharing one single InternalKeyPropertiesCollector with all Table Builders. In LOG Files, we're outputting number of kDeletedKeys as connected with a single table, while it's actually the total count of deleted keys since creation of the DB. For example, this table has 3155 entries and 1391828 deleted keys. The problem with current approach that we call methods on a single TablePropertiesCollector for all the tables we create. Even worse, we could do it from multiple threads at the same time and TablePropertiesCollector has no way of knowing which table we're calling it for. Good part: Looks like nobody inside Facebook is using Options::table_properties_collectors. This means we should be able to painfully change the API. In this change, I introduce TablePropertiesCollectorFactory. For every table we create, we call `CreateTablePropertiesCollector`, which creates a TablePropertiesCollector for a single table. We then use it sequentially from a single thread, which means it doesn't have to be thread-safe. Test Plan: Added a test in table_properties_collector_test that fails on master (build two tables, assert that kDeletedKeys count is correct for the second one). Also, all other tests Reviewers: sdong, dhruba, haobo, kailiu Reviewed By: kailiu CC: leveldb Differential Revision: https://reviews.facebook.net/D18579
549 lines
24 KiB
C++
549 lines
24 KiB
C++
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include "rocksdb/options.h"
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#define __STDC_FORMAT_MACROS
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#include <inttypes.h>
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#include <limits>
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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/filter_policy.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/table.h"
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#include "rocksdb/table_properties.h"
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#include "table/block_based_table_factory.h"
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namespace rocksdb {
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ColumnFamilyOptions::ColumnFamilyOptions()
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: comparator(BytewiseComparator()),
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merge_operator(nullptr),
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compaction_filter(nullptr),
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compaction_filter_factory(std::shared_ptr<CompactionFilterFactory>(
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new DefaultCompactionFilterFactory())),
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compaction_filter_factory_v2(new DefaultCompactionFilterFactoryV2()),
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write_buffer_size(4 << 20),
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max_write_buffer_number(2),
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min_write_buffer_number_to_merge(1),
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block_cache(nullptr),
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block_cache_compressed(nullptr),
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block_size(4096),
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block_restart_interval(16),
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compression(kSnappyCompression),
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filter_policy(nullptr),
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prefix_extractor(nullptr),
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whole_key_filtering(true),
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num_levels(7),
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level0_file_num_compaction_trigger(4),
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level0_slowdown_writes_trigger(20),
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level0_stop_writes_trigger(24),
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max_mem_compaction_level(2),
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target_file_size_base(2 * 1048576),
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target_file_size_multiplier(1),
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max_bytes_for_level_base(10 * 1048576),
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max_bytes_for_level_multiplier(10),
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max_bytes_for_level_multiplier_additional(num_levels, 1),
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expanded_compaction_factor(25),
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source_compaction_factor(1),
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max_grandparent_overlap_factor(10),
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disable_seek_compaction(true),
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soft_rate_limit(0.0),
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hard_rate_limit(0.0),
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rate_limit_delay_max_milliseconds(1000),
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no_block_cache(false),
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arena_block_size(0),
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disable_auto_compactions(false),
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purge_redundant_kvs_while_flush(true),
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block_size_deviation(10),
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compaction_style(kCompactionStyleLevel),
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verify_checksums_in_compaction(true),
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filter_deletes(false),
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max_sequential_skip_in_iterations(8),
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memtable_factory(std::shared_ptr<SkipListFactory>(new SkipListFactory)),
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table_factory(
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std::shared_ptr<TableFactory>(new BlockBasedTableFactory())),
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inplace_update_support(false),
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inplace_update_num_locks(10000),
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inplace_callback(nullptr),
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memtable_prefix_bloom_bits(0),
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memtable_prefix_bloom_probes(6),
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memtable_prefix_bloom_huge_page_tlb_size(0),
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bloom_locality(0),
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max_successive_merges(0),
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min_partial_merge_operands(2) {
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assert(memtable_factory.get() != nullptr);
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}
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ColumnFamilyOptions::ColumnFamilyOptions(const Options& options)
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: comparator(options.comparator),
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merge_operator(options.merge_operator),
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compaction_filter(options.compaction_filter),
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compaction_filter_factory(options.compaction_filter_factory),
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compaction_filter_factory_v2(options.compaction_filter_factory_v2),
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write_buffer_size(options.write_buffer_size),
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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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block_cache(options.block_cache),
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block_cache_compressed(options.block_cache_compressed),
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block_size(options.block_size),
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block_restart_interval(options.block_restart_interval),
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compression(options.compression),
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compression_per_level(options.compression_per_level),
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compression_opts(options.compression_opts),
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filter_policy(options.filter_policy),
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prefix_extractor(options.prefix_extractor),
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whole_key_filtering(options.whole_key_filtering),
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num_levels(options.num_levels),
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level0_file_num_compaction_trigger(
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options.level0_file_num_compaction_trigger),
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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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max_mem_compaction_level(options.max_mem_compaction_level),
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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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max_bytes_for_level_base(options.max_bytes_for_level_base),
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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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expanded_compaction_factor(options.expanded_compaction_factor),
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source_compaction_factor(options.source_compaction_factor),
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max_grandparent_overlap_factor(options.max_grandparent_overlap_factor),
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disable_seek_compaction(options.disable_seek_compaction),
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soft_rate_limit(options.soft_rate_limit),
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hard_rate_limit(options.hard_rate_limit),
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rate_limit_delay_max_milliseconds(
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options.rate_limit_delay_max_milliseconds),
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no_block_cache(options.no_block_cache),
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arena_block_size(options.arena_block_size),
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disable_auto_compactions(options.disable_auto_compactions),
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purge_redundant_kvs_while_flush(options.purge_redundant_kvs_while_flush),
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block_size_deviation(options.block_size_deviation),
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compaction_style(options.compaction_style),
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verify_checksums_in_compaction(options.verify_checksums_in_compaction),
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compaction_options_universal(options.compaction_options_universal),
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filter_deletes(options.filter_deletes),
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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_factory(options.table_factory),
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table_properties_collector_factories(
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options.table_properties_collector_factories),
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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_bits(options.memtable_prefix_bloom_bits),
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memtable_prefix_bloom_probes(options.memtable_prefix_bloom_probes),
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memtable_prefix_bloom_huge_page_tlb_size(
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options.memtable_prefix_bloom_huge_page_tlb_size),
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bloom_locality(options.bloom_locality),
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max_successive_merges(options.max_successive_merges),
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min_partial_merge_operands(options.min_partial_merge_operands) {
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assert(memtable_factory.get() != nullptr);
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}
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DBOptions::DBOptions()
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: create_if_missing(false),
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error_if_exists(false),
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paranoid_checks(true),
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env(Env::Default()),
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info_log(nullptr),
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info_log_level(INFO_LEVEL),
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max_open_files(5000),
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max_total_wal_size(0),
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statistics(nullptr),
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disableDataSync(false),
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use_fsync(false),
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db_stats_log_interval(1800),
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db_log_dir(""),
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wal_dir(""),
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delete_obsolete_files_period_micros(6 * 60 * 60 * 1000000UL),
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max_background_compactions(1),
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max_background_flushes(1),
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max_log_file_size(0),
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log_file_time_to_roll(0),
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keep_log_file_num(1000),
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max_manifest_file_size(std::numeric_limits<uint64_t>::max()),
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table_cache_numshardbits(4),
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table_cache_remove_scan_count_limit(16),
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WAL_ttl_seconds(0),
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WAL_size_limit_MB(0),
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manifest_preallocation_size(4 * 1024 * 1024),
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allow_os_buffer(true),
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allow_mmap_reads(false),
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allow_mmap_writes(false),
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is_fd_close_on_exec(true),
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skip_log_error_on_recovery(false),
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stats_dump_period_sec(3600),
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advise_random_on_open(true),
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access_hint_on_compaction_start(NORMAL),
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use_adaptive_mutex(false),
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bytes_per_sync(0),
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allow_thread_local(true) {}
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DBOptions::DBOptions(const Options& options)
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: create_if_missing(options.create_if_missing),
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error_if_exists(options.error_if_exists),
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paranoid_checks(options.paranoid_checks),
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env(options.env),
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info_log(options.info_log),
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info_log_level(options.info_log_level),
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max_open_files(options.max_open_files),
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max_total_wal_size(options.max_total_wal_size),
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statistics(options.statistics),
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disableDataSync(options.disableDataSync),
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use_fsync(options.use_fsync),
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db_stats_log_interval(options.db_stats_log_interval),
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db_log_dir(options.db_log_dir),
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wal_dir(options.wal_dir),
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delete_obsolete_files_period_micros(
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options.delete_obsolete_files_period_micros),
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max_background_compactions(options.max_background_compactions),
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max_background_flushes(options.max_background_flushes),
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max_log_file_size(options.max_log_file_size),
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log_file_time_to_roll(options.log_file_time_to_roll),
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keep_log_file_num(options.keep_log_file_num),
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max_manifest_file_size(options.max_manifest_file_size),
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table_cache_numshardbits(options.table_cache_numshardbits),
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table_cache_remove_scan_count_limit(
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options.table_cache_remove_scan_count_limit),
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WAL_ttl_seconds(options.WAL_ttl_seconds),
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WAL_size_limit_MB(options.WAL_size_limit_MB),
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manifest_preallocation_size(options.manifest_preallocation_size),
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allow_os_buffer(options.allow_os_buffer),
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allow_mmap_reads(options.allow_mmap_reads),
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allow_mmap_writes(options.allow_mmap_writes),
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is_fd_close_on_exec(options.is_fd_close_on_exec),
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skip_log_error_on_recovery(options.skip_log_error_on_recovery),
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stats_dump_period_sec(options.stats_dump_period_sec),
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advise_random_on_open(options.advise_random_on_open),
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access_hint_on_compaction_start(options.access_hint_on_compaction_start),
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use_adaptive_mutex(options.use_adaptive_mutex),
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bytes_per_sync(options.bytes_per_sync),
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allow_thread_local(options.allow_thread_local) {}
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static const char* const access_hints[] = {
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"NONE", "NORMAL", "SEQUENTIAL", "WILLNEED"
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};
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void DBOptions::Dump(Logger* log) const {
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Log(log," Options.error_if_exists: %d", error_if_exists);
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Log(log," Options.create_if_missing: %d", create_if_missing);
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Log(log," Options.paranoid_checks: %d", paranoid_checks);
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Log(log," Options.env: %p", env);
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Log(log," Options.info_log: %p", info_log.get());
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Log(log," Options.max_open_files: %d", max_open_files);
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Log(log," Options.max_total_wal_size: %" PRIu64, max_total_wal_size);
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Log(log, " Options.disableDataSync: %d", disableDataSync);
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Log(log, " Options.use_fsync: %d", use_fsync);
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Log(log, " Options.max_log_file_size: %zu", max_log_file_size);
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Log(log, "Options.max_manifest_file_size: %lu",
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(unsigned long)max_manifest_file_size);
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Log(log, " Options.log_file_time_to_roll: %zu", log_file_time_to_roll);
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Log(log, " Options.keep_log_file_num: %zu", keep_log_file_num);
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Log(log, " Options.db_stats_log_interval: %d", db_stats_log_interval);
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Log(log, " Options.allow_os_buffer: %d", allow_os_buffer);
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Log(log, " Options.allow_mmap_reads: %d", allow_mmap_reads);
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Log(log, " Options.allow_mmap_writes: %d", allow_mmap_writes);
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Log(log, " Options.db_log_dir: %s",
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db_log_dir.c_str());
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Log(log, " Options.wal_dir: %s",
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wal_dir.c_str());
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Log(log, " Options.table_cache_numshardbits: %d",
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table_cache_numshardbits);
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Log(log, " Options.table_cache_remove_scan_count_limit: %d",
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table_cache_remove_scan_count_limit);
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Log(log, " Options.delete_obsolete_files_period_micros: %lu",
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(unsigned long)delete_obsolete_files_period_micros);
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Log(log, " Options.max_background_compactions: %d",
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max_background_compactions);
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Log(log, " Options.max_background_flushes: %d",
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max_background_flushes);
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Log(log, " Options.WAL_ttl_seconds: %lu",
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(unsigned long)WAL_ttl_seconds);
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Log(log, " Options.WAL_size_limit_MB: %lu",
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(unsigned long)WAL_size_limit_MB);
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Log(log, " Options.manifest_preallocation_size: %zu",
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manifest_preallocation_size);
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Log(log, " Options.allow_os_buffer: %d",
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allow_os_buffer);
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Log(log, " Options.allow_mmap_reads: %d",
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allow_mmap_reads);
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Log(log, " Options.allow_mmap_writes: %d",
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allow_mmap_writes);
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Log(log, " Options.is_fd_close_on_exec: %d",
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is_fd_close_on_exec);
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Log(log, " Options.skip_log_error_on_recovery: %d",
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skip_log_error_on_recovery);
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Log(log, " Options.stats_dump_period_sec: %u",
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stats_dump_period_sec);
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Log(log, " Options.advise_random_on_open: %d",
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advise_random_on_open);
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Log(log, " Options.access_hint_on_compaction_start: %s",
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access_hints[access_hint_on_compaction_start]);
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Log(log, " Options.use_adaptive_mutex: %d",
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use_adaptive_mutex);
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Log(log, " Options.bytes_per_sync: %lu",
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(unsigned long)bytes_per_sync);
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} // DBOptions::Dump
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void ColumnFamilyOptions::Dump(Logger* log) const {
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Log(log, " Options.comparator: %s", comparator->Name());
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Log(log, " Options.merge_operator: %s",
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merge_operator ? merge_operator->Name() : "None");
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Log(log, " Options.compaction_filter_factory: %s",
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compaction_filter_factory->Name());
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Log(log, " Options.compaction_filter_factory_v2: %s",
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compaction_filter_factory_v2->Name());
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Log(log, " Options.memtable_factory: %s", memtable_factory->Name());
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Log(log, " Options.table_factory: %s", table_factory->Name());
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Log(log, " Options.write_buffer_size: %zd", write_buffer_size);
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Log(log, " Options.max_write_buffer_number: %d", max_write_buffer_number);
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Log(log," Options.block_cache: %p", block_cache.get());
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Log(log," Options.block_cache_compressed: %p",
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block_cache_compressed.get());
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if (block_cache) {
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Log(log," Options.block_cache_size: %zd",
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block_cache->GetCapacity());
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}
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if (block_cache_compressed) {
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Log(log,"Options.block_cache_compressed_size: %zd",
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block_cache_compressed->GetCapacity());
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}
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Log(log," Options.block_size: %zd", block_size);
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Log(log," Options.block_restart_interval: %d", block_restart_interval);
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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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Log(log," Options.compression[%d]: %d",
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i, compression_per_level[i]);
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}
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} else {
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Log(log," Options.compression: %d", compression);
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}
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Log(log," Options.filter_policy: %s",
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filter_policy == nullptr ? "nullptr" : filter_policy->Name());
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Log(log," Options.prefix_extractor: %s",
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prefix_extractor == nullptr ? "nullptr" : prefix_extractor->Name());
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Log(log," Options.whole_key_filtering: %d", whole_key_filtering);
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Log(log," Options.num_levels: %d", num_levels);
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Log(log," Options.min_write_buffer_number_to_merge: %d",
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min_write_buffer_number_to_merge);
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Log(log," Options.purge_redundant_kvs_while_flush: %d",
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purge_redundant_kvs_while_flush);
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Log(log," Options.compression_opts.window_bits: %d",
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compression_opts.window_bits);
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Log(log," Options.compression_opts.level: %d",
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compression_opts.level);
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Log(log," Options.compression_opts.strategy: %d",
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compression_opts.strategy);
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Log(log," Options.level0_file_num_compaction_trigger: %d",
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level0_file_num_compaction_trigger);
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Log(log," Options.level0_slowdown_writes_trigger: %d",
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level0_slowdown_writes_trigger);
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Log(log," Options.level0_stop_writes_trigger: %d",
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level0_stop_writes_trigger);
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Log(log," Options.max_mem_compaction_level: %d",
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max_mem_compaction_level);
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Log(log," Options.target_file_size_base: %d",
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target_file_size_base);
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Log(log," Options.target_file_size_multiplier: %d",
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target_file_size_multiplier);
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Log(log," Options.max_bytes_for_level_base: %lu",
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(unsigned long)max_bytes_for_level_base);
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Log(log," Options.max_bytes_for_level_multiplier: %d",
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|
max_bytes_for_level_multiplier);
|
|
for (int i = 0; i < num_levels; i++) {
|
|
Log(log,"Options.max_bytes_for_level_multiplier_addtl[%d]: %d",
|
|
i, max_bytes_for_level_multiplier_additional[i]);
|
|
}
|
|
Log(log," Options.max_sequential_skip_in_iterations: %lu",
|
|
(unsigned long)max_sequential_skip_in_iterations);
|
|
Log(log," Options.expanded_compaction_factor: %d",
|
|
expanded_compaction_factor);
|
|
Log(log," Options.source_compaction_factor: %d",
|
|
source_compaction_factor);
|
|
Log(log," Options.max_grandparent_overlap_factor: %d",
|
|
max_grandparent_overlap_factor);
|
|
Log(log," Options.disable_seek_compaction: %d",
|
|
disable_seek_compaction);
|
|
Log(log," Options.no_block_cache: %d",
|
|
no_block_cache);
|
|
Log(log," Options.arena_block_size: %zu",
|
|
arena_block_size);
|
|
Log(log," Options.soft_rate_limit: %.2f",
|
|
soft_rate_limit);
|
|
Log(log," Options.hard_rate_limit: %.2f",
|
|
hard_rate_limit);
|
|
Log(log," Options.rate_limit_delay_max_milliseconds: %u",
|
|
rate_limit_delay_max_milliseconds);
|
|
Log(log," Options.disable_auto_compactions: %d",
|
|
disable_auto_compactions);
|
|
Log(log," Options.purge_redundant_kvs_while_flush: %d",
|
|
purge_redundant_kvs_while_flush);
|
|
Log(log," Options.block_size_deviation: %d",
|
|
block_size_deviation);
|
|
Log(log," Options.filter_deletes: %d",
|
|
filter_deletes);
|
|
Log(log, " Options.verify_checksums_in_compaction: %d",
|
|
verify_checksums_in_compaction);
|
|
Log(log," Options.compaction_style: %d",
|
|
compaction_style);
|
|
Log(log," Options.compaction_options_universal.size_ratio: %u",
|
|
compaction_options_universal.size_ratio);
|
|
Log(log,"Options.compaction_options_universal.min_merge_width: %u",
|
|
compaction_options_universal.min_merge_width);
|
|
Log(log,"Options.compaction_options_universal.max_merge_width: %u",
|
|
compaction_options_universal.max_merge_width);
|
|
Log(log,"Options.compaction_options_universal."
|
|
"max_size_amplification_percent: %u",
|
|
compaction_options_universal.max_size_amplification_percent);
|
|
Log(log,
|
|
"Options.compaction_options_universal.compression_size_percent: %u",
|
|
compaction_options_universal.compression_size_percent);
|
|
std::string collector_names;
|
|
for (const auto& collector_factory : table_properties_collector_factories) {
|
|
collector_names.append(collector_factory->Name());
|
|
collector_names.append("; ");
|
|
}
|
|
Log(log, " Options.table_properties_collectors: %s",
|
|
collector_names.c_str());
|
|
Log(log, " Options.inplace_update_support: %d",
|
|
inplace_update_support);
|
|
Log(log, " Options.inplace_update_num_locks: %zd",
|
|
inplace_update_num_locks);
|
|
Log(log, " Options.min_partial_merge_operands: %u",
|
|
min_partial_merge_operands);
|
|
// TODO: easier config for bloom (maybe based on avg key/value size)
|
|
Log(log, " Options.memtable_prefix_bloom_bits: %d",
|
|
memtable_prefix_bloom_bits);
|
|
Log(log, " Options.memtable_prefix_bloom_probes: %d",
|
|
memtable_prefix_bloom_probes);
|
|
Log(log, " Options.memtable_prefix_bloom_huge_page_tlb_size: %zu",
|
|
memtable_prefix_bloom_huge_page_tlb_size);
|
|
Log(log, " Options.bloom_locality: %d",
|
|
bloom_locality);
|
|
Log(log, " Options.max_successive_merges: %zd",
|
|
max_successive_merges);
|
|
} // ColumnFamilyOptions::Dump
|
|
|
|
void Options::Dump(Logger* log) const {
|
|
DBOptions::Dump(log);
|
|
ColumnFamilyOptions::Dump(log);
|
|
} // Options::Dump
|
|
|
|
//
|
|
// The goal of this method is to create a configuration that
|
|
// allows an application to write all files into L0 and
|
|
// then do a single compaction to output all files into L1.
|
|
Options*
|
|
Options::PrepareForBulkLoad()
|
|
{
|
|
// never slowdown ingest.
|
|
level0_file_num_compaction_trigger = (1<<30);
|
|
level0_slowdown_writes_trigger = (1<<30);
|
|
level0_stop_writes_trigger = (1<<30);
|
|
|
|
// no auto compactions please. The application should issue a
|
|
// manual compaction after all data is loaded into L0.
|
|
disable_auto_compactions = true;
|
|
disable_seek_compaction = true;
|
|
disableDataSync = true;
|
|
|
|
// A manual compaction run should pick all files in L0 in
|
|
// a single compaction run.
|
|
source_compaction_factor = (1<<30);
|
|
|
|
// 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;
|
|
|
|
// 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;
|
|
}
|
|
|
|
// Optimization functions
|
|
ColumnFamilyOptions* ColumnFamilyOptions::OptimizeForPointLookup() {
|
|
prefix_extractor.reset(NewNoopTransform());
|
|
BlockBasedTableOptions block_based_options;
|
|
block_based_options.index_type = BlockBasedTableOptions::kBinarySearch;
|
|
table_factory.reset(new BlockBasedTableFactory(block_based_options));
|
|
memtable_factory.reset(NewHashLinkListRepFactory());
|
|
return this;
|
|
}
|
|
|
|
ColumnFamilyOptions* ColumnFamilyOptions::OptimizeLevelStyleCompaction(
|
|
uint64_t memtable_memory_budget) {
|
|
write_buffer_size = 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 = 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_compactions = total_threads - 1;
|
|
max_background_flushes = 1;
|
|
env->SetBackgroundThreads(total_threads, Env::LOW);
|
|
env->SetBackgroundThreads(1, Env::HIGH);
|
|
return this;
|
|
}
|
|
|
|
} // namespace rocksdb
|