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https://issues.apache.org/jira/browse/HIVE-4078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13629362#comment-13629362
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Hudson commented on HIVE-4078:
------------------------------
Integrated in Hive-trunk-h0.21 #2056 (See
[https://builds.apache.org/job/Hive-trunk-h0.21/2056/])
HIVE-4078 : Delay the serialize-deserialize pair in
CommonJoinTaskDispatcher (Gopal V via Ashutosh Chauhan) (Revision 1466768)
Result = ABORTED
hashutosh :
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1466768
Files :
*
/hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/optimizer/physical/CommonJoinResolver.java
> Delay the serialize-deserialize pair in CommonJoinTaskDispatcher
> ----------------------------------------------------------------
>
> Key: HIVE-4078
> URL: https://issues.apache.org/jira/browse/HIVE-4078
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Gopal V
> Assignee: Gopal V
> Labels: client, perfomance
> Fix For: 0.11.0
>
> Attachments: HIVE-4078-20130305.2.patch, HIVE-4078-20130305.patch,
> HIVE-4078-20130406.patch, HIVE-4078-trunk-rebase.patch
>
>
> CommonJoinProcessor tries to clone a MapredWork while attempting a conversion
> to a map-join
> {code}
> // deep copy a new mapred work from xml
> InputStream in = new ByteArrayInputStream(xml.getBytes("UTF-8"));
> MapredWork newWork = Utilities.deserializeMapRedWork(in,
> physicalContext.getConf());
> {code}
> which is a very heavy operation memory wise & cpu-wise.
> It would be better to do this only if a conditional task is required,
> resulting in a copy of the task.
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