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https://issues.apache.org/jira/browse/HIVE-4103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13637709#comment-13637709
]
Hudson commented on HIVE-4103:
------------------------------
Integrated in Hive-trunk-h0.21 #2073 (See
[https://builds.apache.org/job/Hive-trunk-h0.21/2073/])
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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