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https://issues.apache.org/jira/browse/MAPREDUCE-102?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Harsh J resolved MAPREDUCE-102.
-------------------------------

    Resolution: Not A Problem

Not a problem anymore on any of the recent stable releases - and we've not seen 
this error appear again either. The methods that remove a tracker use proper 
locking today that seems to prevent this from occurring anymore.

Gone stale, closing as 'Not a Problem' (anymore).
                
> NPE in tracker expiry thread.
> -----------------------------
>
>                 Key: MAPREDUCE-102
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-102
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Vinod Kumar Vavilapalli
>
> I see NullPointerExceptions in Task Expiry thread of the JobTracker. 
> Exception log in JT:
> {code}
> 2009-02-28 07:22:51,392 ERROR org.apache.hadoop.mapred.JobTracker: Tracker 
> Expiry Thread got exception: java.lang.NullPointerException
> {code}

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