[jira] [Commented] (TRAFODION-2604) sort operator merge phase memory pool improvement

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TRAFODION-2604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15993883#comment-15993883 ] 

ASF GitHub Bot commented on TRAFODION-2604:
-------------------------------------------

GitHub user prashanth-vasudev opened a pull request:

    https://github.com/apache/incubator-trafodion/pull/1081

    [TRAFODION-2604] sort merge phase memory pool improvements

    

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/prashanth-vasudev/incubator-trafodion traf2604

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/incubator-trafodion/pull/1081.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #1081
    
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> sort operator merge phase memory pool improvement 
> --------------------------------------------------
>
>                 Key: TRAFODION-2604
>                 URL: https://issues.apache.org/jira/browse/TRAFODION-2604
>             Project: Apache Trafodion
>          Issue Type: Bug
>            Reporter: Prashanth Vasudev
>            Assignee: Prashanth Vasudev
>             Fix For: 2.2-incubating
>
>
> Currently, executor sort goes through initial sort phase followed by merge phase in overflow situation. The memory pool used during sort phase is not efficiently reused for merge phase , causing sort merge to slow down in case of large merge. Sort merge happens only if sort overflows.
> Fix is to detect overflow situation and reuse the memory pool for merge phase.



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