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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