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https://issues.apache.org/jira/browse/MAPREDUCE-3566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13180126#comment-13180126
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Hudson commented on MAPREDUCE-3566:
-----------------------------------
Integrated in Hadoop-Mapreduce-0.23-Commit #351 (See
[https://builds.apache.org/job/Hadoop-Mapreduce-0.23-Commit/351/])
Merge -c 1227422 from trunk to branch-0.23 to fix MAPREDUCE-3566. Fixed MR
AM to construct CLC only once across all tasks.
acmurthy :
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1227424
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/MapReduceChildJVM.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/main/java/org/apache/hadoop/mapreduce/v2/app/launcher/ContainerRemoteLaunchEvent.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
*
/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/TestMRApp.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/job/impl/TestMapReduceChildJVM.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/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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