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https://issues.apache.org/jira/browse/YARN-547?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Omkar Vinit Joshi updated YARN-547:
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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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