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https://issues.apache.org/jira/browse/KYLIN-1694?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dong Li updated KYLIN-1694:
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Assignee: kangkaisen (was: Dong Li)
> 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: kangkaisen
> Attachments: KYLIN-1694.patch
>
>
> 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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