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Posted to dev@hive.apache.org by "Gunther Hagleitner (JIRA)" <ji...@apache.org> on 2013/10/07 22:56:48 UTC

[jira] [Commented] (HIVE-5270) Enable hash joins using tez

    [ https://issues.apache.org/jira/browse/HIVE-5270?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13788559#comment-13788559 ] 

Gunther Hagleitner commented on HIVE-5270:
------------------------------------------

https://reviews.facebook.net/D13323

> Enable hash joins using tez
> ---------------------------
>
>                 Key: HIVE-5270
>                 URL: https://issues.apache.org/jira/browse/HIVE-5270
>             Project: Hive
>          Issue Type: Bug
>          Components: Tez
>    Affects Versions: tez-branch
>            Reporter: Vikram Dixit K
>            Assignee: Vikram Dixit K
>         Attachments: BroadCastJoinsHiveOnTez.pdf, HIVE-5270.1.patch
>
>
> Since hash join involves replicating a hash table to all the map tasks, an equivalent operation needs to be performed in tez. In the tez world, such an operation is done via a broadcast edge (TEZ-410). We need to rework the planning and execution phases within hive for this.



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