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Posted to yarn-issues@hadoop.apache.org by "Subru Krishnan (JIRA)" <ji...@apache.org> on 2017/10/11 23:42:01 UTC
[jira] [Commented] (YARN-574) PrivateLocalizer does not support
parallel resource download via ContainerLocalizer
[ https://issues.apache.org/jira/browse/YARN-574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16201200#comment-16201200 ]
Subru Krishnan commented on YARN-574:
-------------------------------------
Pushing it out from 2.9.0 due to lack of recent activity. Feel free to revert if required.
> PrivateLocalizer does not support parallel resource download via ContainerLocalizer
> -----------------------------------------------------------------------------------
>
> Key: YARN-574
> URL: https://issues.apache.org/jira/browse/YARN-574
> Project: Hadoop YARN
> Issue Type: Sub-task
> Affects Versions: 2.6.0, 2.8.0, 2.7.1
> Reporter: Omkar Vinit Joshi
> Assignee: Ajith S
> Attachments: YARN-574.03.patch, YARN-574.04.patch, YARN-574.05.patch, YARN-574.1.patch, YARN-574.2.patch
>
>
> At present private resources will be downloaded in parallel only if multiple containers request the same resource. However otherwise it will be serial. The protocol between PrivateLocalizer and ContainerLocalizer supports multiple downloads however it is not used and only one resource is sent for downloading at a time.
> I think we can increase / assure parallelism (even for single container requesting resource) for private/application resources by making multiple downloads per ContainerLocalizer.
> Total Parallelism before
> = number of threads allotted for PublicLocalizer [public resource] + number of containers[private and application resource]
> Total Parallelism after
> = number of threads allotted for PublicLocalizer [public resource] + number of containers * max downloads per container [private and application resource]
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