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https://issues.apache.org/jira/browse/KYLIN-2242?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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kangkaisen closed KYLIN-2242.
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> 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
> Fix For: v2.0.0
>
> Attachments: KYLIN-2242.patch
>
>
> 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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