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From "Chris Trezzo (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5727) Improve YARN shared cache support for LinuxContainerExecutor
Date Mon, 13 Aug 2018 18:38:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-5727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16578769#comment-16578769

Chris Trezzo commented on YARN-5727:

Assigning to [~wzzdreamer]. He will start working on a new draft for the 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: Sub-task
>            Reporter: Chris Trezzo
>            Assignee: zhenzhao wang
>            Priority: Major
>         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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