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9385a5247e
rocksdb/util/options.cc
Igor Canadi 9385a5247e [RocksDB] [Column Family] Interface proposal 
Summary:
<This diff is for Column Family branch>

Sharing some of the work I've done so far. This diff compiles and passes the tests.

The biggest change is in options.h - I broke down Options into two parts - DBOptions and ColumnFamilyOptions. DBOptions is DB-specific (env, create_if_missing, block_cache, etc.) and ColumnFamilyOptions is column family-specific (all compaction options, compresion options, etc.). Note that this does not break backwards compatibility at all.

Further, I created DBWithColumnFamily which inherits DB interface and adds new functions with column family support. Clients can transparently switch to DBWithColumnFamily and it will not break their backwards compatibility.
There are few methods worth checking out: ListColumnFamilies(), MultiNewIterator(), MultiGet() and GetSnapshot(). [GetSnapshot() returns the snapshot across all column families for now - I think that's what we agreed on]

Finally, I made small changes to WriteBatch so we are able to atomically insert data across column families.

Please provide feedback.

Test Plan: make check works, the code is backward compatible

Reviewers: dhruba, haobo, sdong, kailiu, emayanke

CC: leveldb

Differential Revision: https://reviews.facebook.net/D14445
2013-12-18 13:08:22 -08:00

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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/merge_operator.h"
#include "table/block_based_table_factory.h"
namespace rocksdb {
ColumnFamilyOptions::ColumnFamilyOptions()
: comparator(BytewiseComparator()),
merge_operator(nullptr),
compaction_filter(nullptr),
compaction_filter_factory(
std::shared_ptr<CompactionFilterFactory>(
new DefaultCompactionFilterFactory())),
write_buffer_size(4<<20),
max_write_buffer_number(2),
min_write_buffer_number_to_merge(1),
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),
disable_seek_compaction(false),
soft_rate_limit(0.0),
hard_rate_limit(0.0),
rate_limit_delay_max_milliseconds(1000),
no_block_cache(false),
table_cache_numshardbits(4),
table_cache_remove_scan_count_limit(16),
disable_auto_compactions(false),
purge_redundant_kvs_while_flush(true),
block_size_deviation(10),
compaction_style(kCompactionStyleLevel),
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) {
assert(memtable_factory.get() != nullptr);
}
DBOptions::DBOptions()
: create_if_missing(false),
error_if_exists(false),
paranoid_checks(false),
env(Env::Default()),
info_log(nullptr),
max_open_files(1000),
disableDataSync(false),
use_fsync(false),
db_stats_log_interval(1800),
db_log_dir(""),
wal_dir(""),
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),
max_manifest_file_size(std::numeric_limits<uint64_t>::max()),
arena_block_size(0),
WAL_ttl_seconds(0),
WAL_size_limit_MB(0),
manifest_preallocation_size(4 * 1024 * 1024),
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),
advise_random_on_open(true),
access_hint_on_compaction_start(NORMAL),
use_adaptive_mutex(false),
bytes_per_sync(0) { }
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: %ld", 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: %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: %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: %ld",
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: %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: %lu",
(unsigned long)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.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);
} // 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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