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Date: Thu, 15 Apr 2010 04:58:53 -0400 (EDT)
From: "Amareshwari Sriramadasu (JIRA)" <jira@apache.org>
To: mapreduce-dev@hadoop.apache.org
Subject: [jira] Created: (MAPREDUCE-1707) TaskRunner can get NPE in getting
 ugi from TaskTracker
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TaskRunner can get NPE in getting ugi from TaskTracker
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                 Key: MAPREDUCE-1707
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1707
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: tasktracker
    Affects Versions: 0.22.0
            Reporter: Amareshwari Sriramadasu
             Fix For: 0.22.0


The following code in TaskRunner can get NPE in the scenario described below.
{code}
      UserGroupInformation ugi = 
        tracker.getRunningJob(t.getJobID()).getUGI();
{code}

The scenario:
Tracker got a LaunchTaskAction; Task is localized and TaskRunner is started.
Then Tracker got a KillJobAction; This would issue a kill for the task. But, kill will be a no-op because the task did not actually start; The job is removed from runningJobs. 
Then if TaskRunner calls tracker.getRunningJob(t.getJobID()), it will be null.

Instead of TaskRunner doing a back call to tasktracker to get the ugi, tracker.getRunningJob(t.getJobID()).getUGI(), ugi should be passed a parameter in the constructor of TaskRunner. 


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