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https://issues.apache.org/jira/browse/YARN-8489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16654464#comment-16654464
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Billie Rinaldi commented on YARN-8489:
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I'd suggest not to add a component field, but to add a property to the
component configuration properties. (I don't have a good suggestion for what
the property should be called.) It seems like we would only need to adjust the
behavior of the ServiceScheduler#terminateServiceIfAllComponentsFinished
method. Currently whenever a containers stops, this method checks whether all
components have come to completion, then decides whether to stop the service
and what its final state should be. It would be fairly easy to give some
components precedence, instead of waiting for all components to come to
completion.
> Need to support "dominant" component concept inside YARN service
> ----------------------------------------------------------------
>
> Key: YARN-8489
> URL: https://issues.apache.org/jira/browse/YARN-8489
> Project: Hadoop YARN
> Issue Type: Task
> Components: yarn-native-services
> Reporter: Wangda Tan
> Priority: Major
>
> Existing YARN service support termination policy for different restart
> policies. For example ALWAYS means service will not be terminated. And NEVER
> means if all component terminated, service will be terminated.
> The name "dominant" might not be most appropriate , we can figure out better
> names. But in simple, it means, a dominant component which final state will
> determine job's final state regardless of other components.
> Use cases:
> 1) Tensorflow job has master/worker/services/tensorboard. Once master goes to
> final state, no matter if it is succeeded or failed, we should terminate
> ps/tensorboard/workers. And the mark the job to succeeded/failed.
> 2) Not sure if it is a real-world use case: A service which has multiple
> component, some component is not restartable. For such services, if a
> component is failed, we should mark the whole service to failed.
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