kangkaisen created KYLIN-2242:

             Summary: 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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