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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 Wed, 21 Dec 2011 01:11:30 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13173718#comment-13173718
] 

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

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12508160/MAPREDUCE-3566-20111220.txt
  against trunk revision .

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

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

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

    -1 javac.  The applied patch generated 2310 javac compiler warnings (more than the trunk's
current 2308 warnings).

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

    -1 findbugs.  The patch appears to introduce 1 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/1486//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/1486//artifact/trunk/hadoop-mapreduce-project/patchprocess/newPatchFindbugsWarningshadoop-mapreduce-client-app.html
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/1486//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
>             Fix For: 0.23.1
>
>         Attachments: MAPREDUCE-3566-20111215.txt, MAPREDUCE-3566-20111220.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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