RocksDB 5.2.1 发布了，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 构建。
更新内容：
公共 API 更改
NewLRUCache() will determine number of shard bits automatically based on capacity, if the user doesn't pass one. This also impacts the default block cache when the user doesn't explict provide one.
Change the default of delayed slowdown value to 16MB/s and further increase the L0 stop condition to 36 files.
(Experimental) Two-level indexing that partition the index and creates a 2nd level index on the partitions. The feature can be enabled by setting kTwoLevelIndexSearch as IndexType and configuring index_per_partition.
新特性
Added new overloaded function GetApproximateSizes that allows to specify if memtable stats should be computed only without computing SST files' stats approximations.
Added new function GetApproximateMemTableStats that approximates both number of records and size of memtables.
Bug 修复
RangeSync() should work if ROCKSDB_FALLOCATE_PRESENT is not set
Fix wrong results in a data race case in Get()
Some fixes related to 2PC.
Fix several bugs in Direct I/O supports.
Fix a regression bug which can cause Seek() to miss some keys if the return key has been updated many times after the snapshot which is used by the iterator.
下载地址：https://github.com/facebook/rocksdb/archive/rocksdb-5.2.1.zip
来自:开源中国社区
