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https://issues.apache.org/jira/browse/YARN-5855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16145949#comment-16145949
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Gour Saha commented on YARN-5855:
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DELETE being synchronous makes sense to me too.
Only one point to think on is - since the intent of the app-owner is to destroy
the app, he/she probably doesn't care if the app is stopped elegantly or not
(as long as log-aggregation is done successfully after the app dies). Now in
worst case the API can take up to 10 secs to respond. I think 10 secs is too
high. Do you think we should reduce it? My suggestion is 2 secs.
> 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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