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Posted to issues@kylin.apache.org by "kangkaisen (JIRA)" <ji...@apache.org> on 2017/11/03 06:12:00 UTC

[jira] [Commented] (KYLIN-2992) Avoid OOM in CubeHFileJob.Reducer

    [ https://issues.apache.org/jira/browse/KYLIN-2992?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16237137#comment-16237137 ] 

kangkaisen commented on KYLIN-2992:
-----------------------------------

The main idea is changing reducer sort to shuffle sort, There are two key points:

# implement a {{RowKeyWritable}} class to compare KeyValue with KeyValue.KVComparator()
# construct a KeyValue base on cuboid with KeyValue.createFirstOnRow

The more detail could refer this Chinese blog:  https://blog.bcmeng.com/post/kylin-hfile-improve.html

> Avoid OOM in  CubeHFileJob.Reducer
> ----------------------------------
>
>                 Key: KYLIN-2992
>                 URL: https://issues.apache.org/jira/browse/KYLIN-2992
>             Project: Kylin
>          Issue Type: Improvement
>          Components: Storage - HBase
>    Affects Versions: v2.1.0
>            Reporter: kangkaisen
>            Assignee: kangkaisen
>            Priority: Major
>
> Refer to  HBASE-13897, we also could improve CubeHFileJob.Reducer and avoid OOM.



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