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From "Bikas Saha (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1618) ZKRMStateStore fails to handle updates to znodes not yet created
Date Tue, 21 Jan 2014 05:29:20 GMT

    [ https://issues.apache.org/jira/browse/YARN-1618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13877214#comment-13877214
] 

Bikas Saha commented on YARN-1618:
----------------------------------

What is the scenario? If the app is really going from NEW->SAVING then its incorrect. We
should not save apps that havent been accepted by the scheduler. That was the case unless
the recent changes to save completed information have changed this by design or introduced
a bug. [~vinodkv]? [~jianhe]? Saving an app blocks any progress on the app state machine.
So I dont see why there should be a missing znode unless there is some other bug.

> ZKRMStateStore fails to handle updates to znodes not yet created
> ----------------------------------------------------------------
>
>                 Key: YARN-1618
>                 URL: https://issues.apache.org/jira/browse/YARN-1618
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>    Affects Versions: 2.2.0
>            Reporter: Karthik Kambatla
>            Assignee: Karthik Kambatla
>            Priority: Critical
>         Attachments: yarn-1618-1.patch
>
>
> ZKRMStateStore fails to handle updates to znodes that don't exist. For instance, this
can happen when an app transitions from NEW to FINAL_SAVING. In these cases, the store should
create the missing znode and handle the update.



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