HBase单个scan和并行scan的效率-问答-阿里云开发者社区-阿里云

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开发者社区> 问答> 正文

HBase单个scan和并行scan的效率

hbase小能手

2018-11-06 13:40:03

1077

背景：假设有一个表，一个region，10个hfile，有bf，20条数据。
现在发起一个 get请求
数据在20条数据中
一问 hfile open了几次？
二问有几次rpc调用？

数据不在这20条数据中
一问 hfile open了几次？
二问有几次rpc调用？

分布式数据库 Hbase

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hbase小能手
2019-07-17 23:12:25

强答一下，理论上cpu和内存有富裕的情况下，并发的加载数据到blockcache然后再scan肯定要比单线程的操作快，但是数据量太小和太大都会出现相反的结果。如果数据量不是很大的话，建议请自测试。

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