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https://issues.apache.org/jira/browse/KYLIN-2242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15711996#comment-15711996
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Shaofeng SHI commented on KYLIN-2242:
-------------------------------------

+1 kaisen; it need be fixed

> 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: Dong Li
>
> 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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