| [DBOptions] |
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|
| new_table_reader_for_compaction_inputs=false |
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| recycle_log_file_num=0 |
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| avoid_flush_during_shutdown=false |
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| skip_stats_update_on_db_open=false |
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| use_direct_io_for_flush_and_compaction=false |
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| access_hint_on_compaction_start=NORMAL |
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| allow_fallocate=true |
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| fail_if_options_file_error=false |
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| create_if_missing=false |
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| max_manifest_file_size=18446744073709551615 |
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| write_thread_slow_yield_usec=3 |
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| delayed_write_rate=16777216 |
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| create_missing_column_families=false |
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| error_if_exists=false |
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| allow_concurrent_memtable_write=true |
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| db_log_dir= |
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| paranoid_checks=true |
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| skip_log_error_on_recovery=false |
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| compaction_readahead_size=0 |
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| allow_2pc=false |
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| writable_file_max_buffer_size=1048576 |
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| enable_thread_tracking=false |
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| delete_obsolete_files_period_micros=21600000000 |
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| random_access_max_buffer_size=1048576 |
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| allow_mmap_reads=false |
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| allow_mmap_writes=false |
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| use_adaptive_mutex=false |
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| use_fsync=false |
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| base_background_compactions=1 |
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| max_background_flushes=1 |
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| max_background_compactions=1 |
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| enable_write_thread_adaptive_yield=true |
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| max_file_opening_threads=16 |
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| max_open_files=-1 |
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| table_cache_numshardbits=6 |
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| db_write_buffer_size=0 |
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| wal_bytes_per_sync=0 |
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| keep_log_file_num=1000 |
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| max_total_wal_size=0 |
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| log_file_time_to_roll=0 |
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| manifest_preallocation_size=4194304 |
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| is_fd_close_on_exec=true |
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| max_log_file_size=0 |
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| write_thread_max_yield_usec=100 |
|
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| wal_dir=/var/lib/ceph/mon/ceph-node3/store.db |
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| use_direct_reads=false |
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| WAL_size_limit_MB=0 |
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| max_subcompactions=1 |
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| WAL_ttl_seconds=0 |
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| stats_dump_period_sec=600 |
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| wal_recovery_mode=kPointInTimeRecovery |
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| advise_random_on_open=true |
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| hik_compaction_delay_ms=0 |
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| info_log_level=INFO_LEVEL |
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| bytes_per_sync=0 |
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| dump_malloc_stats=false |
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| avoid_flush_during_recovery=false |
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|
|
| [CFOptions “default”] |
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| compaction_pri=kByCompensatedSize |
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| compaction_filter_factory=nullptr |
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| memtable_factory=SkipListFactory |
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| bottommost_compression=kDisableCompressionOption |
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| compression=kNoCompression |
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| max_sequential_skip_in_iterations=8 |
|
|
| max_bytes_for_level_multiplier_additional=1:1:1:1:1:1:1 |
|
|
| compression_per_level= |
使用这个选项来设置不同层的压缩风格 |
通常我们不压缩level 0 和level 1，值在更高的层压缩数据。你甚至可以再最高层设置最慢的压缩算法，在最底层设置更快的压缩算法（最高层为Lmax）。 |
| max_bytes_for_level_multiplier=10.000000 |
从level1往后，每个level容量是前一个的多少倍 |
|
| max_bytes_for_level_base=1384120320 |
level1的大小 |
建议和level0的大小接近 |
| table_factory=BlockBasedTable |
|
|
| max_successive_merges=0 |
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| arena_block_size=4194304 |
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| merge_operator= |
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|
| target_file_size_multiplier=1 |
每下一层的文件大小会是target_file_size_multiplier倍大于前一层 |
默认target_file_size_multiplier为1，所以每一层文件的大小都一样大 |
| num_levels=7 |
level的层级，一般默认为7 |
这个值一般不进行修改，除非像层数大于7 |
| min_write_buffer_number_to_merge=11 |
在 flush 到 level 0 之前，最少需要被 merge 的 memtable 个数 |
如果这个值是 2，那么当至少有两个 immutable 的 memtable 的时候，RocksDB 会将这两个 immutable memtable 先 merge， 在 flush 到 level 0。预先 merge 能减小需要写入的 key 的数据，譬如一个 key 在不同的 memtable 里面都有修改，那么我们可以 merge 成一次修改。但这个值太大了会影响读取性能， 因为 Get 会遍历所有的 memtable 来看这个 key 是否存在。 |
| prefix_extractor=nullptr |
|
|
| bloom_locality=0 |
|
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| max_write_buffer_number=20 |
最大 memtable 的个数 |
如果 active memtable full 了，并且 active memtable 加上 immutable memtable 的个数已经到了这个阀值，RocksDB 就会停止后续的写入。通常这都是写入太快但是 flush 不及时造成的。 |
| level0_stop_writes_trigger=36 |
|
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| level0_slowdown_writes_trigger=20 |
|
|
| level0_file_num_compaction_trigger=4 |
当 level 0 的文件数据达到这个值的时候，就开始进行 level 0 到 level 1 的 compaction |
通常 level 0 的大小就是 write_buffer_size(memtable的最大尺寸) * min_write_buffer_number_to_merge（最少需要被 merge 的 memtable个数） * level0_file_num_compaction_trigger |
| write_buffer_size=33554432 |
memtable 的最大 size |
如果超过了这个值，RocksDB 就会将其变成 immutable memtable，并在使用另一个新的 memtable |
| memtable_huge_page_size=0 |
|
|
| max_compaction_bytes=16777216000 |
|
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| hard_pending_compaction_bytes_limit=274877906944 |
|
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| target_file_size_base=671088640 |
level 1 SST 文件的 size |
|
| soft_pending_compaction_bytes_limit=68719476736 |
|
|
| comparator=leveldb.BytewiseComparator |
|
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| memtable_insert_with_hint_prefix_extractor=nullptr |
|
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| force_consistency_checks=false |
|
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| max_write_buffer_number_to_maintain=0 |
|
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| paranoid_file_checks=false |
|
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| optimize_filters_for_hits=false |
|
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| level_compaction_dynamic_level_bytes=false |
|
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| purge_redundant_kvs_while_flush=true |
|
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| inplace_update_support=false |
|
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| compaction_style=kCompactionStyleLevel |
|
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| compaction_filter=nullptr |
|
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| disable_auto_compactions=false |
|
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| inplace_update_num_locks=10000 |
|
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| memtable_prefix_bloom_size_ratio=0.000000 |
|
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| report_bg_io_stats=false |
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|
|
| [TableOptions/BlockBasedTable “default”] |
|
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| read_amp_bytes_per_bit=8589934592 |
|
|
| format_version=2 |
|
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| whole_key_filtering=true |
|
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| filter_policy=rocksdb.BuiltinBloomFilter |
|
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| verify_compression=false |
|
|
| block_size_deviation=10 |
|
|
| block_size=4096 |
|
|
| partition_filters=false |
|
|
| checksum=kCRC32c |
|
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| hash_index_allow_collision=true |
|
|
| index_block_restart_interval=1 |
|
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| block_restart_interval=16 |
|
|
| no_block_cache=false |
|
|
| pin_l0_filter_and_index_blocks_in_cache=true |
|
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| cache_index_and_filter_blocks_with_high_priority=true |
|
|
| metadata_block_size=4096 |
|
|
| cache_index_and_filter_blocks=true |
|
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| index_type=kBinarySearch |
|
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| flush_block_policy_factory=FlushBlockBySizePolicyFactory |
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|
