Vinod Kumar Vavilapalli created YARN-1210:
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Summary: During RM restart, RM should start a new attempt only
when previous attempt exits for real
Key: YARN-1210
URL: https://issues.apache.org/jira/browse/YARN-1210
Project: Hadoop YARN
Issue Type: Bug
Reporter: Vinod Kumar Vavilapalli
Assignee: Vinod Kumar Vavilapalli
When RM recovers, it can wait for existing AMs to contact RM back and then kill
them forcefully before even starting a new AM. Worst case, RM will start a new
AppAttempt after waiting for 10 mins ( the expiry interval). This way we'll
minimize multiple AMs racing with each other. This can help issues with
downstream components like Pig, Hive and Oozie during RM restart.
In the mean while, new apps will proceed as usual as existing apps wait for
recovery.
This can continue to be useful after work-preserving restart, so that AMs which
can properly sync back up with RM can continue to run and those that don't are
guaranteed to be killed before starting a new attempt.
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