RocksDB 3.4 发布，此版本更新内容如下：
新特性
Support Multiple DB paths in universal style compactions
Add feature of storing plain table index and bloom filter in SST file.
CompactRange() will never output compacted files to level 0. This used to be the case when all the compaction input files were at level 0.
公共 API 修改
DBOptions.db_paths now is a vector of a DBPath structure which indicates both of path and target size
NewPlainTableFactory instead of bunch of parameters now accepts PlainTableOptions, which is defined in include/rocksdb/table.h
Moved include/utilities/.h to include/rocksdb/utilities/.h
Statistics APIs now take uint32_t as type instead of Tickers. Also make two access functions getTickerCount and histogramData const
Add DB property rocksdb.estimate-num-keys, estimated number of live keys in DB.
Add DB::GetIntProperty(), which returns DB properties that are integer as uint64_t.
其他 bug 修复
Fixed a data race bug that might cause segment fault
Fixed a bug of manual compaction.
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。
软件详情：https://github.com/facebook/rocksdb
来自:开源中国社区
