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https://issues.apache.org/jira/browse/YARN-5547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16149882#comment-16149882
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Junping Du commented on YARN-5547:
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Thanks [~vrushalic] for uploading the patch. branch-2.8 patch LGTM. +1. Will
commit it shortly.
> NMLeveldbStateStore should be more tolerant of unknown keys
> -----------------------------------------------------------
>
> Key: YARN-5547
> URL: https://issues.apache.org/jira/browse/YARN-5547
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: nodemanager
> Affects Versions: 2.6.0
> Reporter: Jason Lowe
> Assignee: Ajith S
> Fix For: 2.9.0, 3.0.0-alpha4
>
> Attachments: YARN-5547.01.patch, YARN-5547.02.patch,
> YARN-5547.03.patch, YARN-5547.04.patch, YARN-5547.05.branch-2.patch,
> YARN-5547.05.patch, YARN-5547-branch-2.8.2.001.patch
>
>
> Whenever new keys are added to the NM state store it will break rolling
> downgrades because the code will throw if it encounters an unrecognized key.
> If instead it skipped unrecognized keys it could be simpler to continue
> supporting rolling downgrades. We need to define the semantics of
> unrecognized keys when containers and apps are cleaned up, e.g.: we may want
> to delete all keys underneath an app or container directory when it is being
> removed from the state store to prevent leaking unrecognized keys.
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