[
https://issues.apache.org/jira/browse/YARN-3491?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
zhihai xu updated YARN-3491:
----------------------------
Attachment: YARN-3491.000.patch
> 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
> Attachments: YARN-3491.000.patch
>
>
> 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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
