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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4813) AM timing out during job commit
Date Fri, 30 Nov 2012 02:09:58 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13507040#comment-13507040
] 

Hadoop QA commented on MAPREDUCE-4813:
--------------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12555453/MAPREDUCE-4813.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3085//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3085//console

This message is automatically generated.
                
> AM timing out during job commit
> -------------------------------
>
>                 Key: MAPREDUCE-4813
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4813
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: applicationmaster
>    Affects Versions: 0.23.3, 2.0.1-alpha
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>            Priority: Critical
>         Attachments: MAPREDUCE-4813.patch, MAPREDUCE-4813.patch, MAPREDUCE-4813.patch
>
>
> The AM calls the output committer's {{commitJob}} method synchronously during JobImpl
state transitions, which means the JobImpl write lock is held the entire time the job is being
committed.  Holding the write lock prevents the RM allocator thread from heartbeating to the
RM.  Therefore if committing the job takes too long (e.g.: the job has tons of files to commit
and/or the namenode is bogged down) then the AM appears to be unresponsive to the RM and the
RM kills the AM attempt.

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