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https://issues.apache.org/jira/browse/YARN-4472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15065363#comment-15065363
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Steve Loughran commented on YARN-4472:
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If this is exposed in the {{YarnApplicationState}} it's going to break a lot of
code.
> Introduce additional states in the app and app attempt state machines to keep
> track of the upgrade process
> ----------------------------------------------------------------------------------------------------------
>
> Key: YARN-4472
> URL: https://issues.apache.org/jira/browse/YARN-4472
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: resourcemanager
> Reporter: Giovanni Matteo Fumarola
> Assignee: Marco Rabozzi
>
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