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From "Kan Zhang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1992) NPE in JobTracker's constructor
Date Wed, 04 Aug 2010 20:28:17 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1992?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12895406#action_12895406
] 

Kan Zhang commented on MAPREDUCE-1992:
--------------------------------------

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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