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Posted to issues@hive.apache.org by "Deepak Jaiswal (JIRA)" <ji...@apache.org> on 2017/02/03 22:37:51 UTC

[jira] [Commented] (HIVE-15808) Remove Semijoin reduction branch on reducers if there is hash join

    [ https://issues.apache.org/jira/browse/HIVE-15808?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15852232#comment-15852232 ] 

Deepak Jaiswal commented on HIVE-15808:
---------------------------------------

Posted a review at,

https://reviews.apache.org/r/56294/

> Remove Semijoin reduction branch on reducers if there is hash join
> ------------------------------------------------------------------
>
>                 Key: HIVE-15808
>                 URL: https://issues.apache.org/jira/browse/HIVE-15808
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Deepak Jaiswal
>            Assignee: Deepak Jaiswal
>         Attachments: HIVE-15808.patch
>
>
> It is found that the current logic of cycle detection does not find cycles created when there is a semijoin branch parallel to a hash join on a reducer.
> To avoid such cycles, remove the semijoin reduction optimization.



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