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Date: Thu, 5 Jan 2012 06:26:39 +0000 (UTC)
From: "Hudson (Commented) (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Commented] (MAPREDUCE-3569) TaskAttemptListener holds a
 global lock for all task-updates
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-3569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13180217#comment-13180217 ] 

Hudson commented on MAPREDUCE-3569:
-----------------------------------

Integrated in Hadoop-Mapreduce-0.23-Commit #353 (See [https://builds.apache.org/job/Hadoop-Mapreduce-0.23-Commit/353/])
    merge MAPREDUCE-3569 from trunk

sseth : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1227486
Files : 
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/CHANGES.txt
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapred/TaskAttemptListenerImpl.java
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/TaskAttemptListener.java
* /hadoop/common/branches/branch-0.23/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/branches/branch-0.23/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapred/TestTaskAttemptListenerImpl.java
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/v2/app/MRApp.java

                
> TaskAttemptListener holds a global lock for all task-updates
> ------------------------------------------------------------
>
>                 Key: MAPREDUCE-3569
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3569
>             Project: Hadoop Map/Reduce
>          Issue Type: Sub-task
>          Components: mr-am, mrv2, performance
>    Affects Versions: 0.23.1
>            Reporter: Vinod Kumar Vavilapalli
>            Assignee: Vinod Kumar Vavilapalli
>            Priority: Critical
>             Fix For: 0.23.1
>
>         Attachments: MAPREDUCE-3569-20111115.1.txt, MAPREDUCE-3569-20120104.txt, MR3569.txt
>
>
> This got added via MAPREDUCE-3274. We really don't need the lock if we just implement what I mentioned on that ticket [here|https://issues.apache.org/jira/browse/MAPREDUCE-3274?focusedCommentId=13137214&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13137214].
> This has performance implications on MR AM with lots of tasks.

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