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From "Hadoop QA (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3566) MR AM slows down due to repeatedly constructing ContainerLaunchContext
Date Tue, 03 Jan 2012 20:52:42 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13179007#comment-13179007
] 

Hadoop QA commented on MAPREDUCE-3566:
--------------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12509334/MAPREDUCE-3566-20120103.1.txt
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 11 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 eclipse:eclipse.  The patch built with eclipse:eclipse.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

    +1 core tests.  The patch passed unit tests in .

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/1529//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/1529//console

This message is automatically generated.
                
> MR AM slows down due to repeatedly constructing ContainerLaunchContext
> ----------------------------------------------------------------------
>
>                 Key: MAPREDUCE-3566
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3566
>             Project: Hadoop Map/Reduce
>          Issue Type: Sub-task
>          Components: mr-am, mrv2
>    Affects Versions: 0.23.0
>            Reporter: Vinod Kumar Vavilapalli
>            Assignee: Vinod Kumar Vavilapalli
>            Priority: Critical
>             Fix For: 0.23.1
>
>         Attachments: MAPREDUCE-3566-20111215.txt, MAPREDUCE-3566-20111220.txt, MAPREDUCE-3566-20120103.1.txt,
MAPREDUCE-3566-20120103.txt
>
>
> The construction of the context is expensive, includes per-task trips to NameNode for
obtaining the information about job.jar, job splits etc which is redundant across all tasks.
> We should have a common job-level context and a task-specific context inheriting from
the common job-level context.

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