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From "Vinod K V (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-1707) TaskRunner can get NPE in getting ugi from TaskTracker
Date Tue, 04 May 2010 06:32:56 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1707?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vinod K V updated MAPREDUCE-1707:
---------------------------------

          Status: Resolved  (was: Patch Available)
    Hadoop Flags: [Reviewed]
    Release Note: Fixed a bug that causes TaskRunner to get NPE in getting ugi from TaskTracker
and subsequently crashes it resulting in a failing task after task-timeout period.
      Resolution: Fixed

I just committed this to trunk.

> TaskRunner can get NPE in getting ugi from TaskTracker
> ------------------------------------------------------
>
>                 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
>            Assignee: Vinod K V
>             Fix For: 0.22.0
>
>         Attachments: MAPREDUCE-1707-20100429.txt, MAPREDUCE-1707-20100430.txt
>
>
> 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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