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From "Arun Suresh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5547) NMLeveldbStateStore should be more tolerant of unknown keys
Date Fri, 09 Sep 2016 22:49:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-5547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15478512#comment-15478512
] 

Arun Suresh commented on YARN-5547:
-----------------------------------

I just had an offline discussion with [~chris.douglas]. He was also suggesting a possible
middle ground. Instead of having the entire NM go down because the store can't recognize a
key like we do now, or skipping the specific key like this patch initially proposed and hence
leave the container in a weird state... does it make sense to just skip that particular container
entirely ? Thoughts ?

> 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
>         Attachments: YARN-5547.01.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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