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https://issues.apache.org/jira/browse/YARN-3491?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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zhihai xu updated YARN-3491:
----------------------------
    Summary: PublicLocalizer#addResource is too slow.  (was: Improve the public 
resource localization to do both FSDownload submission to the thread pool and 
completed localization handling in one thread (PublicLocalizer).)

> PublicLocalizer#addResource is too slow.
> ----------------------------------------
>
>                 Key: YARN-3491
>                 URL: https://issues.apache.org/jira/browse/YARN-3491
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: nodemanager
>    Affects Versions: 2.7.0
>            Reporter: zhihai xu
>            Assignee: zhihai xu
>            Priority: Critical
>
> Improve the public resource localization to do both FSDownload submission to 
> the thread pool and completed localization handling in one thread 
> (PublicLocalizer).
> Currently FSDownload submission to the thread pool is done in 
> PublicLocalizer#addResource which is running in Dispatcher thread and 
> completed localization handling is done in PublicLocalizer#run which is 
> running in PublicLocalizer thread.
> Because PublicLocalizer#addResource is time consuming, the thread pool can't 
> be fully utilized. Instead of doing public resource localization in 
> parallel(multithreading), public resource localization is serialized most of 
> the time.
> Also there are two more benefits with this change:
> 1. The Dispatcher thread won't be blocked by PublicLocalizer#addResource . 
> Dispatcher thread handles most of time critical events at Node manager.
> 2. don't need synchronization on HashMap (pending).
> Because pending will be only accessed in PublicLocalizer thread.



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