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From "Omkar Vinit Joshi (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-547) New resource localization is tried even when Localized Resource is in DOWNLOADING state
Date Mon, 15 Apr 2013 18:10:16 GMT

     [ https://issues.apache.org/jira/browse/YARN-547?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Omkar Vinit Joshi updated YARN-547:
-----------------------------------

    Attachment: yarn-547-20130415.patch

Fixing failed test cases. 
                
> 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, yarn-547-20130412.patch,
yarn-547-20130415.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
in DOWNLOADING state.

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