[jira] [Created] (YARN-5727) Improve YARN shared cache support for LinuxContainerExecutor

["Chris Trezzo (JIRA)" <ji...@apache.org>]

Chris Trezzo created YARN-5727:
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             Summary: 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


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. In this document we will discuss various solutions to this problem, all of which 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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