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Date: Thu, 5 Jan 2012 01:36:40 +0000 (UTC)
From: "Hudson (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (MAPREDUCE-3566) MR AM slows down due to
 repeatedly constructing ContainerLaunchContext
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-3566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13180085#comment-13180085 ] 

Hudson commented on MAPREDUCE-3566:
-----------------------------------

Integrated in Hadoop-Hdfs-trunk-Commit #1569 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk-Commit/1569/])
    MAPREDUCE-3566. Fixed MR AM to construct CLC only once across all tasks. Contributed by Vinod K V.

acmurthy : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1227422
Files : 
* /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapred/MapReduceChildJVM.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/job/impl/TaskAttemptImpl.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/launcher/ContainerRemoteLaunchEvent.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/v2/app/MRApp.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/v2/app/TestMRApp.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/v2/app/job/impl/TestMapReduceChildJVM.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/v2/app/job/impl/TestTaskAttempt.java

                
> 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, MAPREDUCE-3566.patch
>
>
> 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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