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Date: Tue, 27 Aug 2013 21:13:54 +0000 (UTC)
From: "Achal Soni (JIRA)" <jira@apache.org>
To: issues@tez.incubator.apache.org
Message-ID: <JIRA.12665294.1377284372026.42162.1377638034119@arcas>
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Subject: [jira] [Commented] (TEZ-393) Handle custom partitioners
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    [ https://issues.apache.org/jira/browse/TEZ-393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13751734#comment-13751734 ] 

Achal Soni commented on TEZ-393:
--------------------------------

I believe that when runtime parallelism is enabled, the reducers are picking up ranges of partitions to optimize sequential reads, so the range partitioning should still work.
                
> Handle custom partitioners
> --------------------------
>
>                 Key: TEZ-393
>                 URL: https://issues.apache.org/jira/browse/TEZ-393
>             Project: Apache Tez
>          Issue Type: Sub-task
>            Reporter: Rohini Palaniswamy
>
>   With dynamic allocation of reducers, cases like range partitioning (for ORDER BY) need to be handled properly. Also many users have other custom partitioners. So might be good to have an option to turn of dynamic reducer allocation in case they don't work well with dynamic allocation. 

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