TaskAttemptListener should respond with errors to unregistered tasks
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Key: MAPREDUCE-3670
URL: https://issues.apache.org/jira/browse/MAPREDUCE-3670
Project: Hadoop Map/Reduce
Issue Type: Task
Components: mr-am, mrv2
Affects Versions: 0.23.0
Reporter: Siddharth Seth
The TaskAttemptListener currently accepts TaskUmbilical calls from tasks which
may have already been unregistered and processes updates. It should just send
back Exceptions so that the tasks die.
This isn't critical though - since the task/container would eventually be
killed by the AM (via a call to NM stopContainer).
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