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Posted to issues@kylin.apache.org by "Dong Li (JIRA)" <ji...@apache.org> on 2016/05/27 05:57:12 UTC
[jira] [Resolved] (KYLIN-1694) make multiply coefficient
configurable when estimating cuboid size
[ https://issues.apache.org/jira/browse/KYLIN-1694?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Dong Li resolved KYLIN-1694.
----------------------------
Resolution: Fixed
Fix Version/s: v1.5.3
> 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
> Fix For: v1.5.3
>
> 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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