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https://issues.apache.org/jira/browse/YARN-7248?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16179231#comment-16179231
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Jason Lowe commented on YARN-7248:
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Clients should pass a version flag or something similar to indicate that they
understand and expect the new SCHEDULED enum, and that new enum should be
mapped to the older enum values for older clients for backwards compatibility.
> NM returns new SCHEDULED container status to older clients
> ----------------------------------------------------------
>
> Key: YARN-7248
> URL: https://issues.apache.org/jira/browse/YARN-7248
> Project: Hadoop YARN
> Issue Type: Bug
> Components: nodemanager
> Affects Versions: 2.9.0, 3.0.0-alpha2
> Reporter: Jason Lowe
> Priority: Blocker
>
> YARN-4597 added a new SCHEDULED container state and that state is returned to
> clients when the container is localizing, etc. However the client may be
> running on an older software version that does not have the new SCHEDULED
> state which could lead the client to crash on the unexpected container state
> value or make incorrect assumptions like any state != NEW and != RUNNING must
> be COMPLETED which was true in the older version.
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