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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 02:35:22 GMT

    [ https://issues.apache.org/jira/browse/YARN-1618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13877117#comment-13877117
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Bikas Saha commented on YARN-1618:
----------------------------------

How can an app finish before it has been saved in the store? In case that is happening then
its probably a bug. An application that hasnt entered the ACCEPTED state is not present in
the store. So if it fails in that state then it should be forgotten immediately. The store
should not get a notification to save that app.
The contract with the user is that the app has to be in ACCEPTED state before it becomes resilient
to RM restart.

> 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
>
> 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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