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From "Ramya R (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-754) NPE in expiry thread when a TT is lost
Date Mon, 13 Jul 2009 12:05:14 GMT
NPE in expiry thread when a TT is lost
--------------------------------------

                 Key: MAPREDUCE-754
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-754
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: jobtracker
            Reporter: Ramya R
            Priority: Minor


NullPointerException is obtained in Tracker Expiry Thread. Below is the exception obtained
in the JT logs 
{noformat}
ERROR org.apache.hadoop.mapred.JobTracker: Tracker Expiry Thread got exception: java.lang.NullPointerException
        at org.apache.hadoop.mapred.JobTracker.updateTaskTrackerStatus(JobTracker.java:2971)
        at org.apache.hadoop.mapred.JobTracker.access$300(JobTracker.java:104)
        at org.apache.hadoop.mapred.JobTracker$ExpireTrackers.run(JobTracker.java:381)
        at java.lang.Thread.run(Thread.java:619)
{noformat}
The steps to reproduce this issue are:
* Blacklist a TT. 
* Restart it. 
* The above exception is obtained when the first instance of TT is marked as lost.

However the above exception does not break any functionality.




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