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https://issues.apache.org/jira/browse/YARN-8734?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16597902#comment-16597902
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Eric Yang commented on YARN-8734:
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[~billie.rinaldi] {quote}We might need to check the individual components of
the remote service to see if they are in READY state. I think the service can
be in state STABLE before all its components are READY – or at least that used
to be the case. I can't recall if we've fixed that.{quote}
This may have been fixed in YARN-7939. I have not observed service state
anomaly during upgrade dependency test.
{quote}Also, we should consider checking for cycles that would prevent both /
multiple services from starting.{quote}
This is likely a client side check to prevent circular service dependency from
being launched to avoid adding app specific logic into resource manager.
> Readiness check for remote service
> ----------------------------------
>
> Key: YARN-8734
> URL: https://issues.apache.org/jira/browse/YARN-8734
> Project: Hadoop YARN
> Issue Type: New Feature
> Components: yarn-native-services
> Reporter: Eric Yang
> Priority: Major
>
> When a service is deploying, there can be remote service dependency. It
> would be nice to describe ZooKeeper as a dependent service, and the service
> has reached a stable state, then deploy HBase.
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