Aug 08, 2021 · LSM-Tree全称是Log Structured Merge Tree(日志合并树),是一种分层,有序,面向磁盘的数据结构,其核心思想是充分了利用了,磁盘批量的顺序写要远比随机写性能高出很多,围绕这一原理进行设计和优化,以此让写性能达到最优,正如我们普通的Log的写入方式,这种结构的写入,全部都是以Append的模式追加,不存在删除和修改。 当然有得就有舍,这种结构虽然大大提升了数据的写入能力,却是以牺牲部分读取性能为代价,故此这种结构通常适合于写多读少的场景。 故LSM被设计来提供比传统的B+树或者ISAM更好的写操作吞吐量,通过消去随机的本地更新操作来达到这个目标。. "/>
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简介 hbase是bigtable的开源山寨版本.是建立的hdfs之上,提供高可靠性.高性能.列存储.可伸缩.实时读写的数据库系统.它介于nosql和RDBMS之间,仅能通过主键(row key)和主键的range来检索数据,仅支持单行事务(可通过hive支持来实现多表join等复杂操作).主要用来存储非结构化.
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