f383641a1d
Summary: Performing unordered writes in rocksdb when unordered_write option is set to true. When enabled the writes to memtable are done without joining any write thread. This offers much higher write throughput since the upcoming writes would not have to wait for the slowest memtable write to finish. The tradeoff is that the writes visible to a snapshot might change over time. If the application cannot tolerate that, it should implement its own mechanisms to work around that. Using TransactionDB with WRITE_PREPARED write policy is one way to achieve that. Doing so increases the max throughput by 2.2x without however compromising the snapshot guarantees. The patch is prepared based on an original by siying Existing unit tests are extended to include unordered_write option. Benchmark Results: ``` TEST_TMPDIR=/dev/shm/ ./db_bench_unordered --benchmarks=fillrandom --threads=32 --num=10000000 -max_write_buffer_number=16 --max_background_jobs=64 --batch_size=8 --writes=3000000 -level0_file_num_compaction_trigger=99999 --level0_slowdown_writes_trigger=99999 --level0_stop_writes_trigger=99999 -enable_pipelined_write=false -disable_auto_compactions --unordered_write=1 ``` With WAL - Vanilla RocksDB: 78.6 MB/s - WRITER_PREPARED with unordered_write: 177.8 MB/s (2.2x) - unordered_write: 368.9 MB/s (4.7x with relaxed snapshot guarantees) Without WAL - Vanilla RocksDB: 111.3 MB/s - WRITER_PREPARED with unordered_write: 259.3 MB/s MB/s (2.3x) - unordered_write: 645.6 MB/s (5.8x with relaxed snapshot guarantees) - WRITER_PREPARED with unordered_write disable concurrency control: 185.3 MB/s MB/s (2.35x) Limitations: - The feature is not yet extended to `max_successive_merges` > 0. The feature is also incompatible with `enable_pipelined_write` = true as well as with `allow_concurrent_memtable_write` = false. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5218 Differential Revision: D15219029 Pulled By: maysamyabandeh fbshipit-source-id: 38f2abc4af8780148c6128acdba2b3227bc81759
310 lines
15 KiB
C++
310 lines
15 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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#include "options/db_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 "port/port.h"
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#include "rocksdb/cache.h"
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#include "rocksdb/env.h"
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#include "rocksdb/sst_file_manager.h"
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#include "rocksdb/wal_filter.h"
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#include "util/logging.h"
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namespace rocksdb {
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ImmutableDBOptions::ImmutableDBOptions() : ImmutableDBOptions(Options()) {}
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ImmutableDBOptions::ImmutableDBOptions(const DBOptions& options)
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: create_if_missing(options.create_if_missing),
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create_missing_column_families(options.create_missing_column_families),
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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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rate_limiter(options.rate_limiter),
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sst_file_manager(options.sst_file_manager),
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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_file_opening_threads(options.max_file_opening_threads),
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statistics(options.statistics),
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use_fsync(options.use_fsync),
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db_paths(options.db_paths),
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db_log_dir(options.db_log_dir),
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wal_dir(options.wal_dir),
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max_subcompactions(options.max_subcompactions),
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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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recycle_log_file_num(options.recycle_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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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_mmap_reads(options.allow_mmap_reads),
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allow_mmap_writes(options.allow_mmap_writes),
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use_direct_reads(options.use_direct_reads),
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use_direct_io_for_flush_and_compaction(
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options.use_direct_io_for_flush_and_compaction),
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allow_fallocate(options.allow_fallocate),
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is_fd_close_on_exec(options.is_fd_close_on_exec),
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advise_random_on_open(options.advise_random_on_open),
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db_write_buffer_size(options.db_write_buffer_size),
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write_buffer_manager(options.write_buffer_manager),
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access_hint_on_compaction_start(options.access_hint_on_compaction_start),
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new_table_reader_for_compaction_inputs(
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options.new_table_reader_for_compaction_inputs),
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random_access_max_buffer_size(options.random_access_max_buffer_size),
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use_adaptive_mutex(options.use_adaptive_mutex),
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listeners(options.listeners),
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enable_thread_tracking(options.enable_thread_tracking),
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enable_pipelined_write(options.enable_pipelined_write),
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unordered_write(options.unordered_write),
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allow_concurrent_memtable_write(options.allow_concurrent_memtable_write),
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enable_write_thread_adaptive_yield(
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options.enable_write_thread_adaptive_yield),
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write_thread_max_yield_usec(options.write_thread_max_yield_usec),
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write_thread_slow_yield_usec(options.write_thread_slow_yield_usec),
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skip_stats_update_on_db_open(options.skip_stats_update_on_db_open),
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wal_recovery_mode(options.wal_recovery_mode),
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allow_2pc(options.allow_2pc),
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row_cache(options.row_cache),
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#ifndef ROCKSDB_LITE
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wal_filter(options.wal_filter),
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#endif // ROCKSDB_LITE
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fail_if_options_file_error(options.fail_if_options_file_error),
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dump_malloc_stats(options.dump_malloc_stats),
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avoid_flush_during_recovery(options.avoid_flush_during_recovery),
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allow_ingest_behind(options.allow_ingest_behind),
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preserve_deletes(options.preserve_deletes),
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two_write_queues(options.two_write_queues),
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manual_wal_flush(options.manual_wal_flush),
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atomic_flush(options.atomic_flush),
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avoid_unnecessary_blocking_io(options.avoid_unnecessary_blocking_io) {
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}
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void ImmutableDBOptions::Dump(Logger* log) const {
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ROCKS_LOG_HEADER(log, " Options.error_if_exists: %d",
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error_if_exists);
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ROCKS_LOG_HEADER(log, " Options.create_if_missing: %d",
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create_if_missing);
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ROCKS_LOG_HEADER(log, " Options.paranoid_checks: %d",
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paranoid_checks);
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ROCKS_LOG_HEADER(log, " Options.env: %p",
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env);
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ROCKS_LOG_HEADER(log, " Options.info_log: %p",
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info_log.get());
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ROCKS_LOG_HEADER(log, " Options.max_file_opening_threads: %d",
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max_file_opening_threads);
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ROCKS_LOG_HEADER(log, " Options.statistics: %p",
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statistics.get());
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ROCKS_LOG_HEADER(log, " Options.use_fsync: %d",
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use_fsync);
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ROCKS_LOG_HEADER(
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log, " Options.max_log_file_size: %" ROCKSDB_PRIszt,
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max_log_file_size);
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ROCKS_LOG_HEADER(log,
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" Options.max_manifest_file_size: %" PRIu64,
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max_manifest_file_size);
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ROCKS_LOG_HEADER(
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log, " Options.log_file_time_to_roll: %" ROCKSDB_PRIszt,
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log_file_time_to_roll);
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ROCKS_LOG_HEADER(
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log, " Options.keep_log_file_num: %" ROCKSDB_PRIszt,
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keep_log_file_num);
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ROCKS_LOG_HEADER(
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log, " Options.recycle_log_file_num: %" ROCKSDB_PRIszt,
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recycle_log_file_num);
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ROCKS_LOG_HEADER(log, " Options.allow_fallocate: %d",
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allow_fallocate);
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ROCKS_LOG_HEADER(log, " Options.allow_mmap_reads: %d",
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allow_mmap_reads);
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ROCKS_LOG_HEADER(log, " Options.allow_mmap_writes: %d",
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allow_mmap_writes);
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ROCKS_LOG_HEADER(log, " Options.use_direct_reads: %d",
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use_direct_reads);
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ROCKS_LOG_HEADER(log,
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" "
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"Options.use_direct_io_for_flush_and_compaction: %d",
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use_direct_io_for_flush_and_compaction);
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ROCKS_LOG_HEADER(log, " Options.create_missing_column_families: %d",
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create_missing_column_families);
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ROCKS_LOG_HEADER(log, " Options.db_log_dir: %s",
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db_log_dir.c_str());
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ROCKS_LOG_HEADER(log, " Options.wal_dir: %s",
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wal_dir.c_str());
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ROCKS_LOG_HEADER(log, " Options.table_cache_numshardbits: %d",
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table_cache_numshardbits);
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ROCKS_LOG_HEADER(log,
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" Options.max_subcompactions: %" PRIu32,
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max_subcompactions);
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ROCKS_LOG_HEADER(log, " Options.max_background_flushes: %d",
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max_background_flushes);
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ROCKS_LOG_HEADER(log,
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" Options.WAL_ttl_seconds: %" PRIu64,
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wal_ttl_seconds);
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ROCKS_LOG_HEADER(log,
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" Options.WAL_size_limit_MB: %" PRIu64,
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wal_size_limit_mb);
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ROCKS_LOG_HEADER(
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log, " Options.manifest_preallocation_size: %" ROCKSDB_PRIszt,
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manifest_preallocation_size);
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ROCKS_LOG_HEADER(log, " Options.is_fd_close_on_exec: %d",
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is_fd_close_on_exec);
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ROCKS_LOG_HEADER(log, " Options.advise_random_on_open: %d",
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advise_random_on_open);
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ROCKS_LOG_HEADER(
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log, " Options.db_write_buffer_size: %" ROCKSDB_PRIszt,
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db_write_buffer_size);
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ROCKS_LOG_HEADER(log, " Options.write_buffer_manager: %p",
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write_buffer_manager.get());
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ROCKS_LOG_HEADER(log, " Options.access_hint_on_compaction_start: %d",
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static_cast<int>(access_hint_on_compaction_start));
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ROCKS_LOG_HEADER(log, " Options.new_table_reader_for_compaction_inputs: %d",
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new_table_reader_for_compaction_inputs);
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ROCKS_LOG_HEADER(
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log, " Options.random_access_max_buffer_size: %" ROCKSDB_PRIszt,
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random_access_max_buffer_size);
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ROCKS_LOG_HEADER(log, " Options.use_adaptive_mutex: %d",
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use_adaptive_mutex);
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ROCKS_LOG_HEADER(log, " Options.rate_limiter: %p",
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rate_limiter.get());
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Header(
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log, " Options.sst_file_manager.rate_bytes_per_sec: %" PRIi64,
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sst_file_manager ? sst_file_manager->GetDeleteRateBytesPerSecond() : 0);
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ROCKS_LOG_HEADER(log, " Options.wal_recovery_mode: %d",
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static_cast<int>(wal_recovery_mode));
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ROCKS_LOG_HEADER(log, " Options.enable_thread_tracking: %d",
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enable_thread_tracking);
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ROCKS_LOG_HEADER(log, " Options.enable_pipelined_write: %d",
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enable_pipelined_write);
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ROCKS_LOG_HEADER(log, " Options.unordered_write: %d",
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unordered_write);
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ROCKS_LOG_HEADER(log, " Options.allow_concurrent_memtable_write: %d",
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allow_concurrent_memtable_write);
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ROCKS_LOG_HEADER(log, " Options.enable_write_thread_adaptive_yield: %d",
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enable_write_thread_adaptive_yield);
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ROCKS_LOG_HEADER(log,
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" Options.write_thread_max_yield_usec: %" PRIu64,
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write_thread_max_yield_usec);
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ROCKS_LOG_HEADER(log,
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" Options.write_thread_slow_yield_usec: %" PRIu64,
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write_thread_slow_yield_usec);
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if (row_cache) {
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ROCKS_LOG_HEADER(
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log,
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" Options.row_cache: %" ROCKSDB_PRIszt,
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row_cache->GetCapacity());
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} else {
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ROCKS_LOG_HEADER(log,
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" Options.row_cache: None");
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}
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#ifndef ROCKSDB_LITE
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ROCKS_LOG_HEADER(log, " Options.wal_filter: %s",
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wal_filter ? wal_filter->Name() : "None");
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#endif // ROCKDB_LITE
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ROCKS_LOG_HEADER(log, " Options.avoid_flush_during_recovery: %d",
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avoid_flush_during_recovery);
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ROCKS_LOG_HEADER(log, " Options.allow_ingest_behind: %d",
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allow_ingest_behind);
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ROCKS_LOG_HEADER(log, " Options.preserve_deletes: %d",
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preserve_deletes);
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ROCKS_LOG_HEADER(log, " Options.two_write_queues: %d",
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two_write_queues);
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ROCKS_LOG_HEADER(log, " Options.manual_wal_flush: %d",
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manual_wal_flush);
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ROCKS_LOG_HEADER(log, " Options.atomic_flush: %d", atomic_flush);
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ROCKS_LOG_HEADER(log,
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" Options.avoid_unnecessary_blocking_io: %d",
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avoid_unnecessary_blocking_io);
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}
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MutableDBOptions::MutableDBOptions()
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: max_background_jobs(2),
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base_background_compactions(-1),
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max_background_compactions(-1),
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avoid_flush_during_shutdown(false),
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writable_file_max_buffer_size(1024 * 1024),
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delayed_write_rate(2 * 1024U * 1024U),
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max_total_wal_size(0),
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delete_obsolete_files_period_micros(6ULL * 60 * 60 * 1000000),
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stats_dump_period_sec(600),
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stats_persist_period_sec(600),
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stats_history_buffer_size(1024 * 1024),
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max_open_files(-1),
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bytes_per_sync(0),
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wal_bytes_per_sync(0),
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strict_bytes_per_sync(false),
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compaction_readahead_size(0) {}
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MutableDBOptions::MutableDBOptions(const DBOptions& options)
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: max_background_jobs(options.max_background_jobs),
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base_background_compactions(options.base_background_compactions),
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max_background_compactions(options.max_background_compactions),
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avoid_flush_during_shutdown(options.avoid_flush_during_shutdown),
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writable_file_max_buffer_size(options.writable_file_max_buffer_size),
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delayed_write_rate(options.delayed_write_rate),
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max_total_wal_size(options.max_total_wal_size),
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delete_obsolete_files_period_micros(
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options.delete_obsolete_files_period_micros),
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stats_dump_period_sec(options.stats_dump_period_sec),
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stats_persist_period_sec(options.stats_persist_period_sec),
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stats_history_buffer_size(options.stats_history_buffer_size),
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max_open_files(options.max_open_files),
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bytes_per_sync(options.bytes_per_sync),
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wal_bytes_per_sync(options.wal_bytes_per_sync),
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strict_bytes_per_sync(options.strict_bytes_per_sync),
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compaction_readahead_size(options.compaction_readahead_size) {}
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void MutableDBOptions::Dump(Logger* log) const {
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ROCKS_LOG_HEADER(log, " Options.max_background_jobs: %d",
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max_background_jobs);
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ROCKS_LOG_HEADER(log, " Options.max_background_compactions: %d",
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max_background_compactions);
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ROCKS_LOG_HEADER(log, " Options.avoid_flush_during_shutdown: %d",
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avoid_flush_during_shutdown);
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ROCKS_LOG_HEADER(
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log, " Options.writable_file_max_buffer_size: %" ROCKSDB_PRIszt,
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writable_file_max_buffer_size);
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ROCKS_LOG_HEADER(log, " Options.delayed_write_rate : %" PRIu64,
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delayed_write_rate);
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ROCKS_LOG_HEADER(log, " Options.max_total_wal_size: %" PRIu64,
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max_total_wal_size);
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ROCKS_LOG_HEADER(
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log, " Options.delete_obsolete_files_period_micros: %" PRIu64,
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delete_obsolete_files_period_micros);
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ROCKS_LOG_HEADER(log, " Options.stats_dump_period_sec: %u",
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stats_dump_period_sec);
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ROCKS_LOG_HEADER(log, " Options.stats_persist_period_sec: %d",
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stats_persist_period_sec);
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ROCKS_LOG_HEADER(
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log,
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" Options.stats_history_buffer_size: %" ROCKSDB_PRIszt,
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stats_history_buffer_size);
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ROCKS_LOG_HEADER(log, " Options.max_open_files: %d",
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max_open_files);
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ROCKS_LOG_HEADER(log,
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" Options.bytes_per_sync: %" PRIu64,
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bytes_per_sync);
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ROCKS_LOG_HEADER(log,
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" Options.wal_bytes_per_sync: %" PRIu64,
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wal_bytes_per_sync);
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ROCKS_LOG_HEADER(log,
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" Options.strict_bytes_per_sync: %d",
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strict_bytes_per_sync);
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ROCKS_LOG_HEADER(log,
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" Options.compaction_readahead_size: %" ROCKSDB_PRIszt,
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compaction_readahead_size);
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}
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} // namespace rocksdb
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