key-value 存儲系統，RocksDB 4.0 發布

jopen 9年前發布 | 5K 次閱讀 RocksDB

RocksDB 是一個來自 非死book 的可嵌入式的支持持久化的 key-value 存儲系統，也可作為 C/S 模式下的存儲數據庫，但主要目的還是嵌入式。RocksDB 基于 LevelDB 構建。關于 RocksDB 的性能說明。

key-value 存儲系統，RocksDB 4.0 發布

RocksDB 4.0 發布，更新內容如下：

新特性

  • Added support for transactions.  See include/rocksdb/utilities/transaction.h for more info.

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  • 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.

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  • Add compression option kZSTDNotFinalCompression for people to experiment ZSTD although its format is not finalized.

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  • 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.

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    公共 API 變化

    • Removed class Env::RandomRWFile and Env::NewRandomRWFile().

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    • Renamed DBOptions.num_subcompactions to DBOptions.max_subcompactions to make the name better match the actual functionality of the option.

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    • 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.

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    • Previous 'experimental' OptimisticTransaction class has been replaced by Transaction class.

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      下載頁面：RocksDB 4.0


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