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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