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https://issues.apache.org/jira/browse/HIVE-13343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15257066#comment-15257066
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Gunther Hagleitner commented on HIVE-13343:
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The map join list only gets cleaned when the task can run in llap, but should
be cleared always - or better yet, initialized each time we run the decider. I
think it's working right now, because the compiler initializes a new decider
each time a query is compiled.
Also, two of the log statements are not very helpful, I think. They repeat
stuff that's already logged (mode) or tell you something obvious (reducer not
running when mode=map).
> Need to disable hybrid grace hash join in llap mode except for dynamically
> partitioned hash join
> ------------------------------------------------------------------------------------------------
>
> Key: HIVE-13343
> URL: https://issues.apache.org/jira/browse/HIVE-13343
> Project: Hive
> Issue Type: Bug
> Components: llap
> Affects Versions: 2.1.0
> Reporter: Vikram Dixit K
> Assignee: Vikram Dixit K
> Attachments: HIVE-13343.1.patch, HIVE-13343.2.patch
>
>
> Due to performance reasons, we should disable use of hybrid grace hash join
> in llap when dynamic partition hash join is not used. With dynamic partition
> hash join, we need hybrid grace hash join due to the possibility of skews.
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