Firefox 135.0 发布
RocksDB 4.0 发布，更新内容如下：
新特性
- Added support for transactions. See include/rocksdb/utilities/transaction.h for more info.
- DB::GetProperty() now accepts “rocksdb.aggregated-table-properties” and “rocksdb.aggregated-table-properties-at-levelN”, in which case it returns aggregated table properties of the target column family, or the aggregated table properties of the specified level N if the “at-level” version is used.
- Add compression option kZSTDNotFinalCompression for people to experiment ZSTD although its format is not finalized.
- We removed the need for LATEST_BACKUP file in BackupEngine. We still keep writing it when we create new backups (because of backward compatibility), but we don’t read it anymore.
公共 API 变化
- Removed class Env::RandomRWFile and Env::NewRandomRWFile().
- Renamed DBOptions.num_subcompactions to DBOptions.max_subcompactions to make the name better match the actual functionality of the option.
- Added Equal() method to the Comparator interface that can optionally be overwritten in cases where equality comparisons can be done more efficiently than three-way comparisons.
- Previous ‘experimental’ OptimisticTransaction class has been replaced by Transaction class.
下载页面：RocksDB 4.0
RocksDB 是一个来自 facebook 的可嵌入式的支持持久化的 key-value 存储系统，也可作为 C/S 模式下的存储数据库，但主要目的还是嵌入式。RocksDB 基于 leveldb” target=”_blank”>LevelDB 构建。关于 RocksDB 的性能说明。
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