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