kangkaisen created KYLIN-2242:
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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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