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rocksdb/util/options.cc
Naman Gupta cbf4a06427 Add option for storing transaction logs in a separate dir 
Summary: In some cases, you might not want to store the data log (write ahead log) files in the same dir as the sst files. An example use case is leaf, which stores sst files in tmpfs. And would like to save the log files in a separate dir (disk) to save memory.

Test Plan: make all. Ran db_test test. A few test failing. P2785018. If you guys don't see an obvious problem with the code, maybe somebody from the rocksdb team could help me debug the issue here. Running this on leaf worked well. I could see logs stored on disk, and deleted appropriately after compactions. Obviously this is only one set of options. The unit tests cover different options. Seems like I'm missing some edge cases.

Reviewers: dhruba, haobo, leveldb

CC: xinyaohu, sumeet

Differential Revision: https://reviews.facebook.net/D13239
2013-10-08 17:40:27 -07:00

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// 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/merge_operator.h"
namespace rocksdb {
Options::Options()
: comparator(BytewiseComparator()),
merge_operator(nullptr),
compaction_filter(nullptr),
create_if_missing(false),
error_if_exists(false),
paranoid_checks(false),
env(Env::Default()),
info_log(nullptr),
write_buffer_size(4<<20),
max_write_buffer_number(2),
min_write_buffer_number_to_merge(1),
max_open_files(1000),
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(0),
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),
arena_block_size(0),
disable_auto_compactions(false),
WAL_ttl_seconds(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),
filter_deletes(false),
max_sequential_skip_in_iterations(8),
memtable_factory(std::shared_ptr<SkipListFactory>(new SkipListFactory)),
compaction_filter_factory(
std::shared_ptr<CompactionFilterFactory>(
new DefaultCompactionFilterFactory())),
purge_log_after_memtable_flush(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.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());
if (block_cache) {
Log(log," Options.block_cache_size: %zd",
block_cache->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: %ld", max_log_file_size);
Log(log,"Options.max_manifest_file_size: %ld",
max_manifest_file_size);
Log(log," Options.log_file_time_to_roll: %ld", log_file_time_to_roll);
Log(log," Options.keep_log_file_num: %ld", 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: %ld",
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: %ld",
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.arena_block_size: %ld",
arena_block_size);
Log(log," Options.delete_obsolete_files_period_micros: %ld",
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: %ld",
WAL_ttl_seconds);
Log(log," Options.manifest_preallocation_size: %ld",
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: %ld",
bytes_per_sync);
Log(log," Options.filter_deletes: %d",
filter_deletes);
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.purge_log_after_memtable_flush: %d",
purge_log_after_memtable_flush);
} // 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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