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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-4103) Remove System.gc() call from the map-join local-task loop
Date Sun, 21 Apr 2013 04:27:18 GMT

    [ https://issues.apache.org/jira/browse/HIVE-4103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13637467#comment-13637467
] 

Hudson commented on HIVE-4103:
------------------------------

Integrated in Hive-trunk-hadoop2 #168 (See [https://builds.apache.org/job/Hive-trunk-hadoop2/168/])
    HIVE-4103 : Remove System.gc() call from the map-join local-task loop (Gopal V via Ashutosh
Chauhan) (Revision 1470227)

     Result = FAILURE
hashutosh : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1470227
Files : 
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/exec/persistence/HashMapWrapper.java

                
> Remove System.gc() call from the map-join local-task loop
> ---------------------------------------------------------
>
>                 Key: HIVE-4103
>                 URL: https://issues.apache.org/jira/browse/HIVE-4103
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Gopal V
>            Assignee: Gopal V
>            Priority: Minor
>             Fix For: 0.12.0
>
>         Attachments: HIVE-4103.patch
>
>
> Hive's HashMapWrapper calls System.gc() twice within the HashMapWrapper::isAbort() which
produces a significant slow-down during the loop.
> {code}
> 2013-03-01 04:54:28 The gc calls took 677 ms
> 2013-03-01 04:54:28     Processing rows:        200000  Hashtable size: 199999  Memory
usage:   62955432        rate:   0.033
> 2013-03-01 04:54:31 The gc calls took 956 ms
> 2013-03-01 04:54:31     Processing rows:        300000  Hashtable size: 299999  Memory
usage:   90826656        rate:   0.048
> 2013-03-01 04:54:33 The gc calls took 967 ms
> 2013-03-01 04:54:33     Processing rows:        384160  Hashtable size: 384160  Memory
usage:   114412712       rate:   0.06
> {code}

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