Le Anh Vu commented on KYLIN-3084:

Using distribute by makes Create flat table step run slower in kylin 2.3.0 
compare to previous versions. Can you guys have another solution for this 
issue? I've already made a comment here on github: 
[https://github.com/apache/kylin/commit/849faec]. Thanks

> File not found Exception when processing union-all in TEZ mode
> --------------------------------------------------------------
>                 Key: KYLIN-3084
>                 URL: https://issues.apache.org/jira/browse/KYLIN-3084
>             Project: Kylin
>          Issue Type: Bug
>            Reporter: Wang Cheng
>            Assignee: Wang Cheng
>            Priority: Minor
>             Fix For: v2.3.0
> If hive.execution.engine=TEZ and hql contains union all, it causes exception 
> like: file not found when materializing the view or redistributing flat hive 
> table.
> Here is the reason:
> http://grokbase.com/t/hive/user/162r80a2g9/anyway-to-avoid-creating-subdirectories-by-insert-with-union
> i.e. "The Tez execution of UNION is entirely parallel &
> the task-ids overlaps - so the files created have to have unique names.
> But the total counts for "Map 1" and "Map 2" are only available as the job
> runs, so they write to different dirs."

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