Shaofeng SHI closed KYLIN-2365.

> multi FactDistinctColumnsReducer task write the same output file
> ----------------------------------------------------------------
>                 Key: KYLIN-2365
>                 URL: https://issues.apache.org/jira/browse/KYLIN-2365
>             Project: Kylin
>          Issue Type: Bug
>          Components: streaming
>    Affects Versions: v1.6.0
>            Reporter: zheng zhifeng
>   Multi FactDistinctColumnsReducer task will write the 
> distinct columns to the same output file if the mapreduce
> property mapreduce.reduce.speculative is true. This will
> make the mapreduce job failed or the output file is redundancy.
>   I think it shoud set mapreduce.reduce.speculative to false on
> Extract Fact Table Distinct Columns step.

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