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https://issues.apache.org/jira/browse/YARN-5630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15477666#comment-15477666
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Arun Suresh commented on YARN-5630:
-----------------------------------
Good point...
One option is to
# keep an in memory reference count of : new_NM_store_key - > running
containers are using new NM store keys
# ensure Db version is written only during NM shutdown. If any new_NM_store_key
has a count > 0, increment dbVersion.
> NM fails to start after downgrade from 2.8 to 2.7
> -------------------------------------------------
>
> Key: YARN-5630
> URL: https://issues.apache.org/jira/browse/YARN-5630
> Project: Hadoop YARN
> Issue Type: Bug
> Components: nodemanager
> Reporter: Jason Lowe
> Assignee: Jason Lowe
> Priority: Blocker
> Attachments: YARN-5630.001.patch, YARN-5630.002.patch
>
>
> A downgrade from 2.8 to 2.7 causes nodemanagers to fail to start due to an
> unrecognized "version" container key on startup. This breaks downgrades from
> 2.8 to 2.7.
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