key-value 存储系统，RocksDB 4.0 发布

jopen 9年前

RocksDB 是一个来自 非死book 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 构建。关于 RocksDB 的性能说明。

key-value 存储系统，RocksDB 4.0 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  • Previous 'experimental' OptimisticTransaction class has been replaced by Transaction class.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