| 配置参数： | 参数含义 | 附加说明 |
|---|---|---|
| [DBOptions] | ||
| new_table_reader_for_compaction_inputs=false | ||
| recycle_log_file_num=0 | ||
| avoid_flush_during_shutdown=false | ||
| skip_stats_update_on_db_open=false | ||
| use_direct_io_for_flush_and_compaction=false | ||
| access_hint_on_compaction_start=NORMAL | ||
| allow_fallocate=true | ||
| fail_if_options_file_error=false | ||
| create_if_missing=false | ||
| max_manifest_file_size=18446744073709551615 | ||
| write_thread_slow_yield_usec=3 | ||
| delayed_write_rate=16777216 | ||
| create_missing_column_families=false | ||
| error_if_exists=false | ||
| allow_concurrent_memtable_write=true | ||
| db_log_dir= | ||
| paranoid_checks=true | ||
| skip_log_error_on_recovery=false | ||
| compaction_readahead_size=0 | ||
| allow_2pc=false | ||
| writable_file_max_buffer_size=1048576 | ||
| enable_thread_tracking=false | ||
| delete_obsolete_files_period_micros=21600000000 | ||
| random_access_max_buffer_size=1048576 | ||
| allow_mmap_reads=false | ||
| allow_mmap_writes=false | ||
| use_adaptive_mutex=false | ||
| use_fsync=false | ||
| base_background_compactions=1 | ||
| max_background_flushes=1 | ||
| max_background_compactions=1 | ||
| enable_write_thread_adaptive_yield=true | ||
| max_file_opening_threads=16 | ||
| max_open_files=-1 | ||
| table_cache_numshardbits=6 | ||
| db_write_buffer_size=0 | ||
| wal_bytes_per_sync=0 | ||
| keep_log_file_num=1000 | ||
| max_total_wal_size=0 | ||
| log_file_time_to_roll=0 | ||
| manifest_preallocation_size=4194304 | ||
| is_fd_close_on_exec=true | ||
| max_log_file_size=0 | ||
| write_thread_max_yield_usec=100 | ||
| wal_dir=/var/lib/ceph/mon/ceph-node3/store.db | ||
| use_direct_reads=false | ||
| WAL_size_limit_MB=0 | ||
| max_subcompactions=1 | ||
| WAL_ttl_seconds=0 | ||
| stats_dump_period_sec=600 | ||
| wal_recovery_mode=kPointInTimeRecovery | ||
| advise_random_on_open=true | ||
| hik_compaction_delay_ms=0 | ||
| info_log_level=INFO_LEVEL | ||
| bytes_per_sync=0 | ||
| dump_malloc_stats=false | ||
| avoid_flush_during_recovery=false | ||
| [CFOptions “default”] | ||
| compaction_pri=kByCompensatedSize | ||
| compaction_filter_factory=nullptr | ||
| memtable_factory=SkipListFactory | ||
| bottommost_compression=kDisableCompressionOption | ||
| compression=kNoCompression | ||
| 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 | ||
| arena_block_size=4194304 | ||
| merge_operator= | ||
| 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 | ||
| 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 | ||
| 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 | ||
| hard_pending_compaction_bytes_limit=274877906944 | ||
| target_file_size_base=671088640 | level 1 SST 文件的 size | |
| soft_pending_compaction_bytes_limit=68719476736 | ||
| comparator=leveldb.BytewiseComparator | ||
| memtable_insert_with_hint_prefix_extractor=nullptr | ||
| force_consistency_checks=false | ||
| max_write_buffer_number_to_maintain=0 | ||
| paranoid_file_checks=false | ||
| optimize_filters_for_hits=false | ||
| level_compaction_dynamic_level_bytes=false | ||
| purge_redundant_kvs_while_flush=true | ||
| inplace_update_support=false | ||
| compaction_style=kCompactionStyleLevel | ||
| compaction_filter=nullptr | ||
| disable_auto_compactions=false | ||
| inplace_update_num_locks=10000 | ||
| memtable_prefix_bloom_size_ratio=0.000000 | ||
| report_bg_io_stats=false | ||
| [TableOptions/BlockBasedTable “default”] | ||
| read_amp_bytes_per_bit=8589934592 | ||
| format_version=2 | ||
| whole_key_filtering=true | ||
| filter_policy=rocksdb.BuiltinBloomFilter | ||
| verify_compression=false | ||
| block_size_deviation=10 | ||
| block_size=4096 | ||
| partition_filters=false | ||
| checksum=kCRC32c | ||
| hash_index_allow_collision=true | ||
| index_block_restart_interval=1 | ||
| block_restart_interval=16 | ||
| no_block_cache=false | ||
| pin_l0_filter_and_index_blocks_in_cache=true | ||
| cache_index_and_filter_blocks_with_high_priority=true | ||
| metadata_block_size=4096 | ||
| cache_index_and_filter_blocks=true | ||
| index_type=kBinarySearch | ||
| flush_block_policy_factory=FlushBlockBySizePolicyFactory |
来源：CSDN
作者：学无止境966
链接：https://blog.csdn.net/qq_23929673/article/details/96507146