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f3cc66632b
Summary:
Try to align the compaction output file boundaries to the next level ones
(grandparent level), to reduce the level compaction write-amplification.
In level compaction, there are "wasted" data at the beginning and end of the
output level files. Align the file boundary can avoid such "wasted" compaction.
With this PR, it tries to align the non-bottommost level file boundaries to its
next level ones. It may cut file when the file size is large enough (at least
50% of target_file_size) and not too large (2x target_file_size).
db_bench shows about 12.56% compaction reduction:
```
TEST_TMPDIR=/data/dbbench2 ./db_bench --benchmarks=fillrandom,readrandom -max_background_jobs=12 -num=400000000 -target_file_size_base=33554432
# baseline:
Flush(GB): cumulative 25.882, interval 7.216
Cumulative compaction: 285.90 GB write, 162.36 MB/s write, 269.68 GB read, 153.15 MB/s read, 2926.7 seconds
# with this change:
Flush(GB): cumulative 25.882, interval 7.753
Cumulative compaction: 249.97 GB write, 141.96 MB/s write, 233.74 GB read, 132.74 MB/s read, 2534.9 seconds
```
The compaction simulator shows a similar result (14% with 100G random data).
As a side effect, with this PR, the SST file size can exceed the
target_file_size, but is capped at 2x target_file_size. And there will be
smaller files. Here are file size statistics when loading 100GB with the target
file size 32MB:
```
baseline this_PR
count 1.656000e+03 1.705000e+03
mean 3.116062e+07 3.028076e+07
std 7.145242e+06 8.046139e+06
```
The feature is enabled by default, to revert to the old behavior disable it
with `AdvancedColumnFamilyOptions.level_compaction_dynamic_file_size = false`
Also includes https://github.com/facebook/rocksdb/issues/1963 to cut file before skippable grandparent file. Which is for
use case like user adding 2 or more non-overlapping data range at the same
time, it can reduce the overlapping of 2 datasets in the lower levels.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10655
Reviewed By: cbi42
Differential Revision: D39552321
Pulled By: jay-zhuang
fbshipit-source-id: 640d15f159ab0cd973f2426cfc3af266fc8bdde2
339 lines
13 KiB
C++
339 lines
13 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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#pragma once
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#include <string>
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#include <vector>
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#include "db/dbformat.h"
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#include "options/db_options.h"
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#include "rocksdb/options.h"
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#include "util/compression.h"
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namespace ROCKSDB_NAMESPACE {
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// ImmutableCFOptions is a data struct used by RocksDB internal. It contains a
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// subset of Options that should not be changed during the entire lifetime
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// of DB. Raw pointers defined in this struct do not have ownership to the data
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// they point to. Options contains std::shared_ptr to these data.
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struct ImmutableCFOptions {
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public:
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static const char* kName() { return "ImmutableCFOptions"; }
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explicit ImmutableCFOptions();
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explicit ImmutableCFOptions(const ColumnFamilyOptions& cf_options);
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CompactionStyle compaction_style;
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CompactionPri compaction_pri;
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const Comparator* user_comparator;
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InternalKeyComparator internal_comparator; // Only in Immutable
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std::shared_ptr<MergeOperator> merge_operator;
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const CompactionFilter* compaction_filter;
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std::shared_ptr<CompactionFilterFactory> compaction_filter_factory;
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int min_write_buffer_number_to_merge;
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int max_write_buffer_number_to_maintain;
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int64_t max_write_buffer_size_to_maintain;
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bool inplace_update_support;
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UpdateStatus (*inplace_callback)(char* existing_value,
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uint32_t* existing_value_size,
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Slice delta_value,
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std::string* merged_value);
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std::shared_ptr<MemTableRepFactory> memtable_factory;
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std::shared_ptr<TableFactory> table_factory;
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Options::TablePropertiesCollectorFactories
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table_properties_collector_factories;
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// This options is required by PlainTableReader. May need to move it
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// to PlainTableOptions just like bloom_bits_per_key
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uint32_t bloom_locality;
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bool level_compaction_dynamic_level_bytes;
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bool level_compaction_dynamic_file_size;
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int num_levels;
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bool optimize_filters_for_hits;
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bool force_consistency_checks;
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uint64_t preclude_last_level_data_seconds;
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std::shared_ptr<const SliceTransform>
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memtable_insert_with_hint_prefix_extractor;
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std::vector<DbPath> cf_paths;
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std::shared_ptr<ConcurrentTaskLimiter> compaction_thread_limiter;
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std::shared_ptr<SstPartitionerFactory> sst_partitioner_factory;
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std::shared_ptr<Cache> blob_cache;
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};
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struct ImmutableOptions : public ImmutableDBOptions, public ImmutableCFOptions {
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explicit ImmutableOptions();
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explicit ImmutableOptions(const Options& options);
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ImmutableOptions(const DBOptions& db_options,
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const ColumnFamilyOptions& cf_options);
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ImmutableOptions(const ImmutableDBOptions& db_options,
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const ImmutableCFOptions& cf_options);
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ImmutableOptions(const DBOptions& db_options,
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const ImmutableCFOptions& cf_options);
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ImmutableOptions(const ImmutableDBOptions& db_options,
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const ColumnFamilyOptions& cf_options);
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};
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struct MutableCFOptions {
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static const char* kName() { return "MutableCFOptions"; }
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explicit MutableCFOptions(const ColumnFamilyOptions& options)
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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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arena_block_size(options.arena_block_size),
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memtable_prefix_bloom_size_ratio(
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options.memtable_prefix_bloom_size_ratio),
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memtable_whole_key_filtering(options.memtable_whole_key_filtering),
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memtable_huge_page_size(options.memtable_huge_page_size),
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max_successive_merges(options.max_successive_merges),
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inplace_update_num_locks(options.inplace_update_num_locks),
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prefix_extractor(options.prefix_extractor),
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experimental_mempurge_threshold(
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options.experimental_mempurge_threshold),
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disable_auto_compactions(options.disable_auto_compactions),
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soft_pending_compaction_bytes_limit(
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options.soft_pending_compaction_bytes_limit),
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hard_pending_compaction_bytes_limit(
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options.hard_pending_compaction_bytes_limit),
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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_compaction_bytes(options.max_compaction_bytes),
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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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ttl(options.ttl),
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periodic_compaction_seconds(options.periodic_compaction_seconds),
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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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compaction_options_fifo(options.compaction_options_fifo),
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compaction_options_universal(options.compaction_options_universal),
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enable_blob_files(options.enable_blob_files),
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min_blob_size(options.min_blob_size),
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blob_file_size(options.blob_file_size),
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blob_compression_type(options.blob_compression_type),
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enable_blob_garbage_collection(options.enable_blob_garbage_collection),
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blob_garbage_collection_age_cutoff(
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options.blob_garbage_collection_age_cutoff),
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blob_garbage_collection_force_threshold(
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options.blob_garbage_collection_force_threshold),
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blob_compaction_readahead_size(options.blob_compaction_readahead_size),
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blob_file_starting_level(options.blob_file_starting_level),
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prepopulate_blob_cache(options.prepopulate_blob_cache),
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max_sequential_skip_in_iterations(
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options.max_sequential_skip_in_iterations),
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check_flush_compaction_key_order(
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options.check_flush_compaction_key_order),
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paranoid_file_checks(options.paranoid_file_checks),
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report_bg_io_stats(options.report_bg_io_stats),
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compression(options.compression),
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bottommost_compression(options.bottommost_compression),
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compression_opts(options.compression_opts),
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bottommost_compression_opts(options.bottommost_compression_opts),
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last_level_temperature(options.last_level_temperature ==
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Temperature::kUnknown
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? options.bottommost_temperature
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: options.last_level_temperature),
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memtable_protection_bytes_per_key(
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options.memtable_protection_bytes_per_key),
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sample_for_compression(
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options.sample_for_compression), // TODO: is 0 fine here?
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compression_per_level(options.compression_per_level) {
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RefreshDerivedOptions(options.num_levels, options.compaction_style);
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}
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MutableCFOptions()
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: write_buffer_size(0),
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max_write_buffer_number(0),
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arena_block_size(0),
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memtable_prefix_bloom_size_ratio(0),
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memtable_whole_key_filtering(false),
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memtable_huge_page_size(0),
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max_successive_merges(0),
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inplace_update_num_locks(0),
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prefix_extractor(nullptr),
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experimental_mempurge_threshold(0.0),
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disable_auto_compactions(false),
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soft_pending_compaction_bytes_limit(0),
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hard_pending_compaction_bytes_limit(0),
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level0_file_num_compaction_trigger(0),
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level0_slowdown_writes_trigger(0),
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level0_stop_writes_trigger(0),
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max_compaction_bytes(0),
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target_file_size_base(0),
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target_file_size_multiplier(0),
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max_bytes_for_level_base(0),
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max_bytes_for_level_multiplier(0),
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ttl(0),
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periodic_compaction_seconds(0),
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compaction_options_fifo(),
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enable_blob_files(false),
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min_blob_size(0),
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blob_file_size(0),
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blob_compression_type(kNoCompression),
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enable_blob_garbage_collection(false),
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blob_garbage_collection_age_cutoff(0.0),
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blob_garbage_collection_force_threshold(0.0),
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blob_compaction_readahead_size(0),
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blob_file_starting_level(0),
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prepopulate_blob_cache(PrepopulateBlobCache::kDisable),
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max_sequential_skip_in_iterations(0),
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check_flush_compaction_key_order(true),
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paranoid_file_checks(false),
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report_bg_io_stats(false),
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compression(Snappy_Supported() ? kSnappyCompression : kNoCompression),
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bottommost_compression(kDisableCompressionOption),
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last_level_temperature(Temperature::kUnknown),
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memtable_protection_bytes_per_key(0),
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sample_for_compression(0) {}
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explicit MutableCFOptions(const Options& options);
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// Must be called after any change to MutableCFOptions
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void RefreshDerivedOptions(int num_levels, CompactionStyle compaction_style);
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void RefreshDerivedOptions(const ImmutableCFOptions& ioptions) {
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RefreshDerivedOptions(ioptions.num_levels, ioptions.compaction_style);
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}
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int MaxBytesMultiplerAdditional(int level) const {
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if (level >=
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static_cast<int>(max_bytes_for_level_multiplier_additional.size())) {
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return 1;
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}
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return max_bytes_for_level_multiplier_additional[level];
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}
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void Dump(Logger* log) const;
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// Memtable related options
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size_t write_buffer_size;
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int max_write_buffer_number;
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size_t arena_block_size;
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double memtable_prefix_bloom_size_ratio;
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bool memtable_whole_key_filtering;
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size_t memtable_huge_page_size;
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size_t max_successive_merges;
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size_t inplace_update_num_locks;
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std::shared_ptr<const SliceTransform> prefix_extractor;
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// [experimental]
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// Used to activate or deactive the Mempurge feature (memtable garbage
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// collection). (deactivated by default). At every flush, the total useful
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// payload (total entries minus garbage entries) is estimated as a ratio
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// [useful payload bytes]/[size of a memtable (in bytes)]. This ratio is then
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// compared to this `threshold` value:
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// - if ratio<threshold: the flush is replaced by a mempurge operation
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// - else: a regular flush operation takes place.
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// Threshold values:
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// 0.0: mempurge deactivated (default).
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// 1.0: recommended threshold value.
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// >1.0 : aggressive mempurge.
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// 0 < threshold < 1.0: mempurge triggered only for very low useful payload
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// ratios.
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// [experimental]
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double experimental_mempurge_threshold;
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// Compaction related options
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bool disable_auto_compactions;
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uint64_t soft_pending_compaction_bytes_limit;
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uint64_t hard_pending_compaction_bytes_limit;
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int level0_file_num_compaction_trigger;
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int level0_slowdown_writes_trigger;
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int level0_stop_writes_trigger;
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uint64_t max_compaction_bytes;
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uint64_t target_file_size_base;
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int target_file_size_multiplier;
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uint64_t max_bytes_for_level_base;
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double max_bytes_for_level_multiplier;
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uint64_t ttl;
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uint64_t periodic_compaction_seconds;
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std::vector<int> max_bytes_for_level_multiplier_additional;
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CompactionOptionsFIFO compaction_options_fifo;
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CompactionOptionsUniversal compaction_options_universal;
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// Blob file related options
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bool enable_blob_files;
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uint64_t min_blob_size;
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uint64_t blob_file_size;
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CompressionType blob_compression_type;
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bool enable_blob_garbage_collection;
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double blob_garbage_collection_age_cutoff;
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double blob_garbage_collection_force_threshold;
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uint64_t blob_compaction_readahead_size;
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int blob_file_starting_level;
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PrepopulateBlobCache prepopulate_blob_cache;
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// Misc options
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uint64_t max_sequential_skip_in_iterations;
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bool check_flush_compaction_key_order;
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bool paranoid_file_checks;
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bool report_bg_io_stats;
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CompressionType compression;
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CompressionType bottommost_compression;
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CompressionOptions compression_opts;
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CompressionOptions bottommost_compression_opts;
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Temperature last_level_temperature;
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uint32_t memtable_protection_bytes_per_key;
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uint64_t sample_for_compression;
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std::vector<CompressionType> compression_per_level;
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// Derived options
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// Per-level target file size.
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std::vector<uint64_t> max_file_size;
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};
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uint64_t MultiplyCheckOverflow(uint64_t op1, double op2);
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// Get the max file size in a given level.
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uint64_t MaxFileSizeForLevel(const MutableCFOptions& cf_options,
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int level, CompactionStyle compaction_style, int base_level = 1,
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bool level_compaction_dynamic_level_bytes = false);
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// Get the max size of an L0 file for which we will pin its meta-blocks when
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// `pin_l0_filter_and_index_blocks_in_cache` is set.
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size_t MaxFileSizeForL0MetaPin(const MutableCFOptions& cf_options);
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#ifndef ROCKSDB_LITE
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Status GetStringFromMutableCFOptions(const ConfigOptions& config_options,
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const MutableCFOptions& mutable_opts,
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std::string* opt_string);
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Status GetMutableOptionsFromStrings(
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const MutableCFOptions& base_options,
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const std::unordered_map<std::string, std::string>& options_map,
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Logger* info_log, MutableCFOptions* new_options);
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#endif // ROCKSDB_LITE
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} // namespace ROCKSDB_NAMESPACE
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