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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-8349) DISTRIBUTE BY should work with tez auto-parallelism enabled
Date Fri, 17 Oct 2014 20:06:34 GMT

    [ https://issues.apache.org/jira/browse/HIVE-8349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14175480#comment-14175480
] 

Gopal V commented on HIVE-8349:
-------------------------------

Committed to 0.14 as well.

> DISTRIBUTE BY should work with tez auto-parallelism enabled
> -----------------------------------------------------------
>
>                 Key: HIVE-8349
>                 URL: https://issues.apache.org/jira/browse/HIVE-8349
>             Project: Hive
>          Issue Type: Bug
>          Components: Physical Optimizer, Tez
>    Affects Versions: 0.14.0
>            Reporter: Gopal V
>            Assignee: Gopal V
>             Fix For: 0.14.0
>
>         Attachments: HIVE-8349.1.patch, HIVE-8349.2.patch, HIVE-8349.3.patch, HIVE-8349.4.patch
>
>
> Current implementation of DISTRIBUTE BY does not work when tez auto-parallelism is turned
on, because of hashCode distribution issues.
> In case of distribute by, the key is actually zero bytes, with only partitioning enabled
via hashCode - this adversely affects the uniform hashing implementation.
> In an ideal scenario, the edge should go from the ordered kv input to the unordered partitioned
edge, to speed up the processing massively.



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