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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4832) MR AM can get in a split brain situation
Date Wed, 02 Jan 2013 23:44:14 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13542561#comment-13542561
] 

Hadoop QA commented on MAPREDUCE-4832:
--------------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12562975/MAPREDUCE-4832.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 7 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/3185//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3185//console

This message is automatically generated.
                
> MR AM can get in a split brain situation
> ----------------------------------------
>
>                 Key: MAPREDUCE-4832
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4832
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: applicationmaster
>    Affects Versions: 2.0.2-alpha, 0.23.5
>            Reporter: Robert Joseph Evans
>            Assignee: Jason Lowe
>            Priority: Critical
>         Attachments: MAPREDUCE-4832.patch
>
>
> It is possible for a networking issue to happen where the RM thinks an AM has gone down
and launches a replacement, but the previous AM is still up and running.  If the previous
AM does not need any more resources from the RM it could try to commit either tasks or jobs.
 This could cause lots of problems where the second AM finishes and tries to commit too. 
This could result in data corruption.  

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