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https://issues.apache.org/jira/browse/YARN-574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16201200#comment-16201200
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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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