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https://issues.apache.org/jira/browse/YARN-2102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14114288#comment-14114288
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Hitesh Shah commented on YARN-2102:
-----------------------------------

Furthermore, it seems simpler to support a collection of users instead of 
expecting the user to serialize a set of users into a string. It also seems 
that the owner field allows a user to be defined where the user name can have 
spaces but the readers/writers list does not support spaces. 

> More generalized timeline ACLs
> ------------------------------
>
>                 Key: YARN-2102
>                 URL: https://issues.apache.org/jira/browse/YARN-2102
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Zhijie Shen
>            Assignee: Zhijie Shen
>         Attachments: GeneralizedTimelineACLs.pdf, YARN-2102.1.patch, 
> YARN-2102.2.patch, YARN-2102.3.patch, YARN-2102.5.patch
>
>
> We need to differentiate the access controls of reading and writing 
> operations, and we need to think about cross-entity access control. For 
> example, if we are executing a workflow of MR jobs, which writing the 
> timeline data of this workflow, we don't want other user to pollute the 
> timeline data of the workflow by putting something under it.



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