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Shaofeng SHI commented on KYLIN-1694: ------------------------------------- The inaccurate estimation might be caused by a bug in HyperLogLog counter: https://issues.apache.org/jira/browse/KYLIN-1624 Suggest you take a try with kylin v1.5.2. > make multiply coefficient configurable when estimating cuboid size > ------------------------------------------------------------------ > > Key: KYLIN-1694 > URL: https://issues.apache.org/jira/browse/KYLIN-1694 > Project: Kylin > Issue Type: Bug > Components: Job Engine > Affects Versions: v1.5.0, v1.5.1 > Reporter: kangkaisen > Assignee: Dong Li > > In the current version of MRv2 build engine, in CubeStatsReader when > estimating cuboid size , the curent method is "cube is memory hungry, storage > size estimation multiply 0.05" and "cube is not memory hungry, storage size > estimation multiply 0.25". > This has one major problems:the default multiply coefficient is smaller, this > will make the estimated cuboid size much less than the actual > cuboid size,which will lead to the region numbers of HBase and the reducer > numbers of CubeHFileJob are both smaller. obviously, the current method > makes the job of CubeHFileJob much slower. > After we remove the the default multiply coefficient, the job of CubeHFileJob > becomes much faster. > we'd better make multiply coefficient configurable and this could be more > friendly for user. -- This message was sent by Atlassian JIRA (v6.3.4#6332)