key-value 存儲系統，RocksDB 3.13 發布，
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。
新特性
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RollbackToSavePoint() in WriteBatch/WriteBatchWithIndex
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Add NewCompactOnDeletionCollectorFactory() in utilities/table_properties_collectors, which allows rocksdb to mark a SST file as need-compaction when it observes at least D deletion entries in any N consecutive entries in that SST file. Note that this feature depends on an experimental NeedCompact() API --- the result of this API will not persist after DB restart.
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Add DBOptions::delete_scheduler. Use NewDeleteScheduler() in include/rocksdb/delete_scheduler.h to create a DeleteScheduler that can be shared among multiple RocksDB instances to control the file deletion rate of SST files that exist in the first db_path.
</li> </ul>公共 API 更新
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Deprecated WriteOptions::timeout_hint_us. We no longer support write timeout. If you really need this option, talk to us and we might consider returning it.
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Deprecated purge_redundant_kvs_while_flush option.
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Removed BackupEngine::NewBackupEngine() and NewReadOnlyBackupEngine() that were deprecated in RocksDB 3.8. Please use BackupEngine::Open() instead.
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Deprecated Compaction Filter V2. We are not aware of any existing use-cases. If you use this filter, your compile will break with RocksDB 3.13. Please let us know if you use it and we'll put it back in RocksDB 3.14.
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Env::FileExists now returns a Status instead of a boolean
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Add statistics::getHistogramString() to print detailed distribution of a histogram metric.
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Add DBOptions::skip_stats_update_on_db_open. When it is on, DB::Open() will run faster as it skips the random reads required for loading necessary stats from SST files to optimize compaction.
</li> </ul>更多內容及下載頁面請點擊：rocksdb-3.13
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