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From "Robert Joseph Evans (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-4071) NPE while executing MRAppMaster shutdown hook
Date Wed, 04 Apr 2012 18:15:23 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-4071?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Robert Joseph Evans updated MAPREDUCE-4071:

    Affects Version/s:     (was: 0.23.2)
                           (was: 0.23.1)
               Status: Open  (was: Patch Available)

Can you please address the findbugs warning. (inconsistent synchronization)

I did a quick look at your patch and I am a bit confused by the implementation of setSignaled.
 I realize that you did not really change the code at all, but is there a reason that the
parameter is ignored?  If you don't know I can look into it myself.
> NPE while executing MRAppMaster shutdown hook
> ---------------------------------------------
>                 Key: MAPREDUCE-4071
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4071
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mr-am, mrv2
>    Affects Versions: 0.23.3, 2.0.0
>            Reporter: Bhallamudi Venkata Siva Kamesh
>            Assignee: Bhallamudi Venkata Siva Kamesh
>         Attachments: MAPREDUCE-4071.patch
> While running the shutdown hook of MRAppMaster, hit NPE
> {noformat}
> Exception in thread "Thread-1" java.lang.NullPointerException
> 	at org.apache.hadoop.mapreduce.v2.app.MRAppMaster$ContainerAllocatorRouter.setSignalled(MRAppMaster.java:668)
> 	at org.apache.hadoop.mapreduce.v2.app.MRAppMaster$MRAppMasterShutdownHook.run(MRAppMaster.java:1004)
> {noformat}

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