TaskTracker should release slot if task is not launched
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                 Key: MAPREDUCE-2214
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2214
             Project: Hadoop Map/Reduce
          Issue Type: Bug
    Affects Versions: 0.20.1
            Reporter: Ramkumar Vadali
            Assignee: Ramkumar Vadali


TaskTracker.TaskInProgress.launchTask() does not launch a task if it is not in 
an expected state. However, in the case where the task is not launched, the 
slot is not released. We have observed this in production - the task was in 
SUCCEEDED state by the time launchTask() got to it and then the slot was never 
released. It is not clear how the task got into that state, but it is better to 
handle the case.

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