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From "Gunther Hagleitner (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-8151) Dynamic partition sort optimization inserts record wrongly to partition when used with GroupBy
Date Thu, 25 Sep 2014 22:07:35 GMT

    [ https://issues.apache.org/jira/browse/HIVE-8151?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14148387#comment-14148387
] 

Gunther Hagleitner commented on HIVE-8151:
------------------------------------------

Comments on rb.

> Dynamic partition sort optimization inserts record wrongly to partition when used with
GroupBy
> ----------------------------------------------------------------------------------------------
>
>                 Key: HIVE-8151
>                 URL: https://issues.apache.org/jira/browse/HIVE-8151
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 0.14.0, 0.13.1
>            Reporter: Prasanth J
>            Assignee: Prasanth J
>            Priority: Critical
>         Attachments: HIVE-8151.1.patch, HIVE-8151.2.patch
>
>
> HIVE-6455 added dynamic partition sort optimization. It added startGroup() method to
FileSink operator to look for changes in reduce key for creating partition directories. This
method however is not reliable as the key called with startGroup() is different from the key
called with processOp(). startGroup() is called with newly changed key whereas processOp()
is called with previously aggregated key. This will result in processOp() writing the last
row of previous group as the first row of next group. This happens only when used with group
by operator.
> The fix is to not rely on startGroup() and do the partition directory creation in processOp()
itself.



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