标签：files leveldb based rocksdb filter cache compaction 转载 bloom
作者：godj链接：https://www.zhihu.com/question/328622742/answer/713388283
RocksDB Features that are not in LevelDB
Performance
- Multithread compaction
- Multithread memtable inserts
- Reduced DB mutex holding
- Optimized level-based compaction style and universal compaction style
- Prefix bloom filter
- Memtable bloom filter
- Single bloom filter covering the whole SST file
- Write lock optimization
- Improved Iter::Prev() performance
- Fewer comparator calls during SkipList searches
- Allocate memtable memory using huge page.
Features
- Column Families
- Transactions and WriteBatchWithIndex
- Backup and Checkpoints
- Merge Operators
- Compaction Filters
- RocksDB Java
- Manual Compactions Run in Parallel with Automatic Compactions
- Persistent Cache
- Bulk loading
- Forward Iterators/ Tailing iterator
- Single delete
- Delete files in range
- Pin iterator key/value
Alternative Data Structures And Formats
- Plain Table format for memory-only use cases
- Vector-based and hash-based memtable format
- Clock-based cache (coming soon)
- Pluggable information log
- Annotate transaction log write with blob (for replication)
Tunability
- Rate limiting
- Tunable Slowdown and Stop threshold
- Option to keep all files open
- Option to keep all index and bloom filter blocks in block cache
- Multiple WAL recovery modes
- Fadvise hints for readahead and to avoid caching in OS page cache
- Option to pin indexes and bloom filters of L0 files in memory
- More Compression Types: zlib, lz4, zstd
- Compression Dictionary
- Checksum Type: xxhash
- Different level size multiplier and compression type for each level.
Manageability
- Statistics
- Thread-local profiling
- More commands in command-line tools
- User-defined table properties
- Event listeners
- More DB Properties
- Dynamic option changes
- Get options from a string or map
- Persistent options to option files
标签：files,leveldb,based,rocksdb,filter,cache,compaction,转载,bloom 来源： https://www.cnblogs.com/jiangshifu/p/16246986.html
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