[jira] [Created] (YARN-5633) Update Container Version in NMStateStore only if Resources have changed

["Arun Suresh (JIRA)" <ji...@apache.org>]

Arun Suresh created YARN-5633:
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             Summary: Update Container Version in NMStateStore only if Resources have changed
                 Key: YARN-5633
                 URL: https://issues.apache.org/jira/browse/YARN-5633
             Project: Hadoop YARN
          Issue Type: Bug
            Reporter: Arun Suresh
            Assignee: Arun Suresh


YARN-5221 introduced a containerVersion that is stored in the NMStateStore. The version is stored when
# the container is first started in the NM
# when the AM requests the NM to increase the Container resources.
# when the RM notifies the NM to decrease the Container resources. 

Unfortunately, this would result in NM not being able to rollback after an upgrade (for eg. from 2.8 > 2.7).. as noticed by [~jlowe].

This JIRA proposes to update the version in the NM state store only when 2 and 3 above occurs, this way, the rollback will be hampered only if the user has used the new feature (resource increase / decrease)





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