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https://issues.apache.org/jira/browse/YARN-7192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16166969#comment-16166969
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Miklos Szegedi commented on YARN-7192:
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[~asuresh], thank you, I think this is very useful. I worked on something
similar on YARN-7009. Could you review that patch to see, if some parts can be
merged/reused? In general that approach is a bit different using a decorator,
so that the production behavior is not changed. We just use it for the the unit
tests. My concern is that it might cause performance/concurrency issues to call
listeners synchronously from the state machine.
> Add a pluggable StateMachine Listener that is notified of NM Container State
> changes
> ------------------------------------------------------------------------------------
>
> Key: YARN-7192
> URL: https://issues.apache.org/jira/browse/YARN-7192
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Arun Suresh
> Assignee: Arun Suresh
> Attachments: YARN-7192.001.patch
>
>
> This JIRA is to add support for a plugggable class in the NodeManager that is
> notified of changes to the Container StateMachine state and the events that
> caused the change.
> The proposal is to modify the basic StateMachine class add support for a hook
> that is called before and after a transition.
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