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From "Omkar Vinit Joshi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-547) New resource localization is tried even when Localized Resource is in DOWNLOADING state
Date Thu, 11 Apr 2013 23:31:16 GMT

    [ https://issues.apache.org/jira/browse/YARN-547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13629569#comment-13629569

Omkar Vinit Joshi commented on YARN-547:

Failed test is actually testing Now invalid transitions. Fixing it.
> New resource localization is tried even when Localized Resource is in DOWNLOADING state
> ---------------------------------------------------------------------------------------
>                 Key: YARN-547
>                 URL: https://issues.apache.org/jira/browse/YARN-547
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Omkar Vinit Joshi
>            Assignee: Omkar Vinit Joshi
>         Attachments: yarn-547-20130411.1.patch, yarn-547-20130411.patch
> At present when multiple containers try to request a localized resource 
> 1) If the resource is not present then first it is created and Resource Localization
starts ( LocalizedResource is in DOWNLOADING state)
> 2) Now if in this state multiple ResourceRequestEvents come in then ResourceLocalizationEvents
are fired for all of them.
> Most of the times it is not resulting into a duplicate resource download but there is
a race condition present there. 
> Location : ResourceLocalizationService.addResource .. addition of the request into "attempts"
in case of an event already exists.
> The root cause for this is the presence of FetchResourceTransition on receiving ResourceRequestEvent

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