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From "Ajith S (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5547) NMLeveldbStateStore should be more tolerant of unknown keys
Date Wed, 14 Sep 2016 13:02:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-5547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15490385#comment-15490385
] 

Ajith S commented on YARN-5547:
-------------------------------

So we have two approaches discussed here
1. Either skip container recovery - this will cause unmonitered containers
2. Container killed/failed

I am ok with second approach, but as per [~jlowe] {{The NM has to unregister with a service
as part of the container failure}} i don't see any solution for such scenario. If this case
we can handle separately, i can update patch based on second approach

> 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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