[jira] [Commented] (MAPREDUCE-5935) TestMRServerPorts#testTaskTrackerPorts fails with null pointer exception.

["Jorge Gabriel Siqueira (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14905183#comment-14905183 ] 

Jorge Gabriel Siqueira commented on MAPREDUCE-5935:
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Is there the possibility to js.fs be initialized after your check? If so, could it cause some problem (because I think it will never be closed)?

> TestMRServerPorts#testTaskTrackerPorts fails with null pointer exception.
> -------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-5935
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5935
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: test
>    Affects Versions: 1.1.1, 1.2.0, 1.2.1
>            Reporter: Jinghui Wang
>            Assignee: Jinghui Wang
>         Attachments: MAPREDUCE-5935.patch
>
>
> The exception is caused by a race condition. The test case calls Jobtracker.offerservice in a seperate thread JTRunner, which initializes the class variable FileSystem fs. In the main thread it tries to close fs in the finally block of code, but at that point jt.fs might still not be initialized, thus causing the NPE.



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