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rocksdb/util/options.cc
Yueh-Hsuan Chiang cda4006e87 Enhance partial merge to support multiple arguments 
Summary:
* PartialMerge api now takes a list of operands instead of two operands.
* Add min_pertial_merge_operands to Options, indicating the minimum
  number of operands to trigger partial merge.
* This diff is based on Schalk's previous diff (D14601), but it also
  includes necessary changes such as updating the pure C api for
  partial merge.

Test Plan:
* make check all
* develop tests for cases where partial merge takes more than two
  operands.

TODOs (from Schalk):
* Add test with min_partial_merge_operands > 2.
* Perform benchmarks to measure the performance improvements (can probably
  use results of task #2837810.)
* Add description of problem to doc/index.html.
* Change wiki pages to reflect the interface changes.

Reviewers: haobo, igor, vamsi

Reviewed By: haobo

CC: leveldb, dhruba

Differential Revision: https://reviews.facebook.net/D16815
2014-03-24 17:57:13 -07:00

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// Copyright (c) 2013, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#include "rocksdb/options.h"
#include <limits>
#include "rocksdb/cache.h"
#include "rocksdb/compaction_filter.h"
#include "rocksdb/comparator.h"
#include "rocksdb/env.h"
#include "rocksdb/filter_policy.h"
#include "rocksdb/memtablerep.h"
#include "rocksdb/merge_operator.h"
#include "rocksdb/slice.h"
#include "rocksdb/slice_transform.h"
#include "rocksdb/table.h"
#include "rocksdb/table_properties.h"
#include "table/block_based_table_factory.h"
namespace rocksdb {
Options::Options()
: comparator(BytewiseComparator()),
merge_operator(nullptr),
compaction_filter(nullptr),
compaction_filter_factory(std::shared_ptr<CompactionFilterFactory>(
new DefaultCompactionFilterFactory())),
create_if_missing(false),
error_if_exists(false),
paranoid_checks(false),
env(Env::Default()),
info_log(nullptr),
info_log_level(INFO),
write_buffer_size(4 << 20),
max_write_buffer_number(2),
min_write_buffer_number_to_merge(1),
max_open_files(1000),
block_cache(nullptr),
block_cache_compressed(nullptr),
block_size(4096),
block_restart_interval(16),
compression(kSnappyCompression),
filter_policy(nullptr),
prefix_extractor(nullptr),
whole_key_filtering(true),
num_levels(7),
level0_file_num_compaction_trigger(4),
level0_slowdown_writes_trigger(8),
level0_stop_writes_trigger(12),
max_mem_compaction_level(2),
target_file_size_base(2 * 1048576),
target_file_size_multiplier(1),
max_bytes_for_level_base(10 * 1048576),
max_bytes_for_level_multiplier(10),
max_bytes_for_level_multiplier_additional(num_levels, 1),
expanded_compaction_factor(25),
source_compaction_factor(1),
max_grandparent_overlap_factor(10),
disableDataSync(false),
use_fsync(false),
db_stats_log_interval(1800),
db_log_dir(""),
wal_dir(""),
disable_seek_compaction(false),
delete_obsolete_files_period_micros(6 * 60 * 60 * 1000000UL),
max_background_compactions(1),
max_background_flushes(0),
max_log_file_size(0),
log_file_time_to_roll(0),
keep_log_file_num(1000),
soft_rate_limit(0.0),
hard_rate_limit(0.0),
rate_limit_delay_max_milliseconds(1000),
max_manifest_file_size(std::numeric_limits<uint64_t>::max()),
no_block_cache(false),
table_cache_numshardbits(4),
table_cache_remove_scan_count_limit(16),
arena_block_size(0),
disable_auto_compactions(false),
WAL_ttl_seconds(0),
WAL_size_limit_MB(0),
manifest_preallocation_size(4 * 1024 * 1024),
purge_redundant_kvs_while_flush(true),
allow_os_buffer(true),
allow_mmap_reads(false),
allow_mmap_writes(true),
is_fd_close_on_exec(true),
skip_log_error_on_recovery(false),
stats_dump_period_sec(3600),
block_size_deviation(10),
advise_random_on_open(true),
access_hint_on_compaction_start(NORMAL),
use_adaptive_mutex(false),
bytes_per_sync(0),
compaction_style(kCompactionStyleLevel),
verify_checksums_in_compaction(true),
filter_deletes(false),
max_sequential_skip_in_iterations(8),
memtable_factory(std::shared_ptr<SkipListFactory>(new SkipListFactory)),
table_factory(
std::shared_ptr<TableFactory>(new BlockBasedTableFactory())),
inplace_update_support(false),
inplace_update_num_locks(10000),
inplace_callback(nullptr),
memtable_prefix_bloom_bits(0),
memtable_prefix_bloom_probes(6),
max_successive_merges(0),
min_partial_merge_operands(2),
allow_thread_local(true) {
assert(memtable_factory.get() != nullptr);
}
static const char* const access_hints[] = {
"NONE", "NORMAL", "SEQUENTIAL", "WILLNEED"
};
void
Options::Dump(Logger* log) const
{
Log(log," Options.comparator: %s", comparator->Name());
Log(log," Options.merge_operator: %s",
merge_operator? merge_operator->Name() : "None");
Log(log," Options.compaction_filter: %s",
compaction_filter? compaction_filter->Name() : "None");
Log(log," Options.compaction_filter_factory: %s",
compaction_filter_factory->Name());
Log(log," Options.memtable_factory: %s",
memtable_factory->Name());
Log(log," Options.table_factory: %s", table_factory->Name());
Log(log," Options.error_if_exists: %d", error_if_exists);
Log(log," Options.create_if_missing: %d", create_if_missing);
Log(log," Options.paranoid_checks: %d", paranoid_checks);
Log(log," Options.env: %p", env);
Log(log," Options.info_log: %p", info_log.get());
Log(log," Options.write_buffer_size: %zd", write_buffer_size);
Log(log," Options.max_write_buffer_number: %d", max_write_buffer_number);
Log(log," Options.max_open_files: %d", max_open_files);
Log(log," Options.block_cache: %p", block_cache.get());
Log(log," Options.block_cache_compressed: %p",
block_cache_compressed.get());
if (block_cache) {
Log(log," Options.block_cache_size: %zd",
block_cache->GetCapacity());
}
if (block_cache_compressed) {
Log(log,"Options.block_cache_compressed_size: %zd",
block_cache_compressed->GetCapacity());
}
Log(log," Options.block_size: %zd", block_size);
Log(log," Options.block_restart_interval: %d", block_restart_interval);
if (!compression_per_level.empty()) {
for (unsigned int i = 0; i < compression_per_level.size(); i++) {
Log(log," Options.compression[%d]: %d",
i, compression_per_level[i]);
}
} else {
Log(log," Options.compression: %d", compression);
}
Log(log," Options.filter_policy: %s",
filter_policy == nullptr ? "nullptr" : filter_policy->Name());
Log(log," Options.prefix_extractor: %s",
prefix_extractor == nullptr ? "nullptr" : prefix_extractor->Name());
Log(log," Options.whole_key_filtering: %d", whole_key_filtering);
Log(log," Options.num_levels: %d", num_levels);
Log(log," Options.disableDataSync: %d", disableDataSync);
Log(log," Options.use_fsync: %d", use_fsync);
Log(log," Options.max_log_file_size: %zu", max_log_file_size);
Log(log,"Options.max_manifest_file_size: %lu",
(unsigned long)max_manifest_file_size);
Log(log," Options.log_file_time_to_roll: %zu", log_file_time_to_roll);
Log(log," Options.keep_log_file_num: %zu", keep_log_file_num);
Log(log," Options.db_stats_log_interval: %d",
db_stats_log_interval);
Log(log," Options.allow_os_buffer: %d", allow_os_buffer);
Log(log," Options.allow_mmap_reads: %d", allow_mmap_reads);
Log(log," Options.allow_mmap_writes: %d", allow_mmap_writes);
Log(log," Options.min_write_buffer_number_to_merge: %d",
min_write_buffer_number_to_merge);
Log(log," Options.purge_redundant_kvs_while_flush: %d",
purge_redundant_kvs_while_flush);
Log(log," Options.compression_opts.window_bits: %d",
compression_opts.window_bits);
Log(log," Options.compression_opts.level: %d",
compression_opts.level);
Log(log," Options.compression_opts.strategy: %d",
compression_opts.strategy);
Log(log," Options.level0_file_num_compaction_trigger: %d",
level0_file_num_compaction_trigger);
Log(log," Options.level0_slowdown_writes_trigger: %d",
level0_slowdown_writes_trigger);
Log(log," Options.level0_stop_writes_trigger: %d",
level0_stop_writes_trigger);
Log(log," Options.max_mem_compaction_level: %d",
max_mem_compaction_level);
Log(log," Options.target_file_size_base: %d",
target_file_size_base);
Log(log," Options.target_file_size_multiplier: %d",
target_file_size_multiplier);
Log(log," Options.max_bytes_for_level_base: %lu",
(unsigned long)max_bytes_for_level_base);
Log(log," Options.max_bytes_for_level_multiplier: %d",
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.db_log_dir: %s",
db_log_dir.c_str());
Log(log," Options.wal_dir: %s",
wal_dir.c_str());
Log(log," Options.disable_seek_compaction: %d",
disable_seek_compaction);
Log(log," Options.no_block_cache: %d",
no_block_cache);
Log(log," Options.table_cache_numshardbits: %d",
table_cache_numshardbits);
Log(log," Options.table_cache_remove_scan_count_limit: %d",
table_cache_remove_scan_count_limit);
Log(log," Options.arena_block_size: %zu",
arena_block_size);
Log(log," Options.delete_obsolete_files_period_micros: %lu",
(unsigned long)delete_obsolete_files_period_micros);
Log(log," Options.max_background_compactions: %d",
max_background_compactions);
Log(log," Options.max_background_flushes: %d",
max_background_flushes);
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.WAL_ttl_seconds: %lu",
(unsigned long)WAL_ttl_seconds);
Log(log," Options.WAL_size_limit_MB: %lu",
(unsigned long)WAL_size_limit_MB);
Log(log," Options.manifest_preallocation_size: %zu",
manifest_preallocation_size);
Log(log," Options.purge_redundant_kvs_while_flush: %d",
purge_redundant_kvs_while_flush);
Log(log," Options.allow_os_buffer: %d",
allow_os_buffer);
Log(log," Options.allow_mmap_reads: %d",
allow_mmap_reads);
Log(log," Options.allow_mmap_writes: %d",
allow_mmap_writes);
Log(log," Options.is_fd_close_on_exec: %d",
is_fd_close_on_exec);
Log(log," Options.skip_log_error_on_recovery: %d",
skip_log_error_on_recovery);
Log(log," Options.stats_dump_period_sec: %u",
stats_dump_period_sec);
Log(log," Options.block_size_deviation: %d",
block_size_deviation);
Log(log," Options.advise_random_on_open: %d",
advise_random_on_open);
Log(log," Options.access_hint_on_compaction_start: %s",
access_hints[access_hint_on_compaction_start]);
Log(log," Options.use_adaptive_mutex: %d",
use_adaptive_mutex);
Log(log," Options.bytes_per_sync: %lu",
(unsigned long)bytes_per_sync);
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 (auto collector : table_properties_collectors) {
collector_names.append(collector->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.max_successive_merges: %zd",
max_successive_merges);
} // 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;
}
} // namespace rocksdb
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