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Update ch3.md #87

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Expand Up @@ -193,7 +193,7 @@ $ cat database

#### 用SSTables制作LSM树

这里描述的算法本质上是LevelDB 【6】和RocksDB 【7】中使用的关键值存储引擎库，被设计嵌入到其他应用程序中。除此之外，LevelDB可以在Riak中用作Bitcask的替代品。在Cassandra和HBase中使用了类似的存储引擎【8】，这两种引擎都受到了Google的Bigtable文档【9】（引入了SSTable和memtable）的启发。
这里描述的算法本质上就是LevelDB 【6】和RocksDB 【7】这类被设计为嵌入到其他应用程序中键值对存储引擎库中使用的。除此之外，LevelDB可以在Riak中用作Bitcask的替代品。在Cassandra和HBase中使用了类似的存储引擎【8】，这两种引擎都受到了Google的Bigtable文档【9】（引入了SSTable和memtable）的启发。

最初这种索引结构是由Patrick O'Neil等人描述的。在日志结构合并树（或LSM树）【10】的基础上，建立在以前的工作上日志结构的文件系统【11】。基于这种合并和压缩排序文件原理的存储引擎通常被称为LSM存储引擎。

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