RocksDB 4.1 发布，key-value 存储系统
12月12日北京OSC源创会 —— 开源技术的年终盛典 »RocksDB 4.1 发布，更新内容如下：
新特性
[*] Added single delete operation as a more efficient way to delete keys that have not been overwritten.
[*] Added experimental AddFile() to DB interface that allow users to addfiles created by SstFileWriter into an empty Database, see include/rocksdb/sst_file_writer.h and DB::AddFile() for more info.
[*] Added support for opening SST files with .ldb suffix which enables opening LevelDB databases.
[*] CompactionFilter now supports filtering of merge operands and merge results.
公共 API 更新
[*] Added SingleDelete() to the DB interface.
[*] Added AddFile() to DB interface.
[*] Added SstFileWriter class.
[*] CompactionFilter has a new method FilterMergeOperand() that RocksDB applies to every merge operand during compaction to decide whether to filter the operand.
[*] We removed CompactionFilterV2 interfaces from include/rocksdb/compaction_filter.h. The functionality was deprecated already in version 3.13.
下载页面：rocksdb-4.1
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。关于 RocksDB 的性能说明。
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