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https://issues.apache.org/jira/browse/MAPREDUCE-1992?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12895406#action_12895406
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Kan Zhang commented on MAPREDUCE-1992:
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I wonder about that, too. But I suggest we commit this patch now so that other
people are unblocked. I'll take a look later on why existing unit tests didn't
catch it and open a new jira if necessary.
> NPE in JobTracker's constructor
> -------------------------------
>
> Key: MAPREDUCE-1992
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1992
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: jobtracker
> Affects Versions: 0.22.0
> Reporter: Ravi Gummadi
> Assignee: Kan Zhang
> Fix For: 0.22.0
>
> Attachments: m1992-02.patch
>
>
> On my local machine, JobTracker is *not* coming up with current trunk. Logs
> show the following NPE:
> 2010-08-03 14:01:41,449 FATAL org.apache.hadoop.mapred.JobTracker:
> java.lang.NullPointerException
> at
> org.apache.hadoop.security.UserGroupInformation.isLoginKeytabBased(UserGroupInformation.java:703)
> at org.apache.hadoop.mapred.JobTracker.<init>(JobTracker.java:1383)
> at org.apache.hadoop.mapred.JobTracker.startTracker(JobTracker.java:275)
> at org.apache.hadoop.mapred.JobTracker.startTracker(JobTracker.java:267)
> at org.apache.hadoop.mapred.JobTracker.startTracker(JobTracker.java:262)
> at org.apache.hadoop.mapred.JobTracker.main(JobTracker.java:4236)
> 2010-08-03 14:01:41,449 INFO org.apache.hadoop.mapred.JobTracker:
> SHUTDOWN_MSG:
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