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https://issues.apache.org/jira/browse/YARN-5727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15589983#comment-15589983
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Chris Trezzo commented on YARN-5727:
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Re-thinking some of the design specifically around the public visibility of the
appId directories in the scstaging directory. I will post an updated design doc.
> Improve YARN shared cache support for LinuxContainerExecutor
> ------------------------------------------------------------
>
> Key: YARN-5727
> URL: https://issues.apache.org/jira/browse/YARN-5727
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Chris Trezzo
> Assignee: Chris Trezzo
> Attachments: YARN-5727-Design-v1.pdf
>
>
> When running LinuxContainerExecutor in a secure mode
> ({{yarn.nodemanager.linux-container-executor.nonsecure-mode.limit-users}} set
> to {{false}}), all localized files are owned by the user that owns the
> container which localized the resource. This presents a problem for the
> shared cache when a YARN application requests a resource to be uploaded to
> the shared cache that has a non-public visibility. The shared cache uploader
> (running as the node manager user) does not have access to the localized
> files and can not compute the checksum of the file or upload it to the cache.
> The solution should ideally satisfy the following three requirements:
> # Localized files should still be safe/secure. Other users that run
> containers should not be able to modify, or delete the publicly localized
> files of others.
> # The node manager user should be able to access these files for the purpose
> of checksumming and uploading to the shared cache without being a privileged
> user.
> # The solution should avoid making unnecessary copies of the localized files.
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