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https://issues.apache.org/jira/browse/YARN-5855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16146014#comment-16146014
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Jian He commented on YARN-5855:
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2 seconds is a bit low, because it takes this full cycle for client to make
sure that the app is fully stopped.
Client issues stop command to AM -> AM unregisters with RM -> RM persists the
final state
During this period client keeps polling RM for app's state to make sure app is
fully stopped
Maybe make it 6 seconds or so?
> DELETE call sometimes returns success when app is not deleted
> -------------------------------------------------------------
>
> Key: YARN-5855
> URL: https://issues.apache.org/jira/browse/YARN-5855
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Billie Rinaldi
> Assignee: Gour Saha
>
> Looking into this issue with [~gsaha], we noticed that multiple things can
> contribute to an app continuing to run after a DELETE call, which consists of
> a stop and a destroy operation. One problem is that the stop call is
> asynchronous unless a force flag is set. Without the force flag, a message is
> sent to the AM and success is returned, and with the flag
> yarnClient.killRunningApplication is called. (There is also an option to wait
> for a fixed amount of time for the app to stop before returning, but DELETE
> is not setting this option and force is preferable in this case.) The other
> issue is that the destroy operation is attempted in a loop, but if the number
> of retries is exceeded the call returns a 204 response.
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