[jira] [Commented] (KYLIN-1694) make multiply coefficient configurable when estimating cuboid size

["Shaofeng SHI (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KYLIN-1694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15284231#comment-15284231 ] 

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.



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