[jira] [Updated] (YARN-547) Race condition in Public Localizer may result into resource getting downloaded again

["Omkar Vinit Joshi (JIRA)" <ji...@apache.org>]

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

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

    Summary: Race condition in Public Localizer may result into resource getting downloaded again  (was: New resource localization is tried even when Localized Resource is in DOWNLOADING state)
    
> Race condition in Public Localizer may result into resource getting downloaded again
> ------------------------------------------------------------------------------------
>
>                 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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