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https://issues.apache.org/jira/browse/KYLIN-2242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15713779#comment-15713779
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kangkaisen commented on KYLIN-2242:
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OK, I am willing to do it, but I maybe delay this work.
> Directly write hdfs file in reducer is dangerous
> ------------------------------------------------
>
> Key: KYLIN-2242
> URL: https://issues.apache.org/jira/browse/KYLIN-2242
> Project: Kylin
> Issue Type: Bug
> Components: Job Engine
> Affects Versions: v1.6.0
> Reporter: kangkaisen
> Assignee: kangkaisen
>
> currently, Kylin directly write hdfs file in {{FactDistinctColumnsReducer}},
> which is dangerous because the MapReduce Speculative Execution will result in
> more than one reducers write the same hdfs file at the same time.
> After KYLIN-2217, I think this issue will occur with higher probability. we
> should output the value by {{context.wirte}} in reducer.
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