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https://issues.apache.org/jira/browse/HADOOP-14077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15863150#comment-15863150
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Yuanbo Liu commented on HADOOP-14077:
-------------------------------------
Also fix some inappropriate operation of null point condition in YARN app
controller.
> Improve the patch of HADOOP-13119
> ---------------------------------
>
> Key: HADOOP-14077
> URL: https://issues.apache.org/jira/browse/HADOOP-14077
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Yuanbo Liu
> Assignee: Yuanbo Liu
>
> For some links(such as "/jmx, /stack"), blocking the links in filter chain
> due to impersonation issue is not friendly for users. For example, user "sam"
> is not allowed to be impersonated by user "knox", and the link "/jmx" doesn't
> need any user to do authorization by default. It only needs user "knox" to do
> authentication, in this case, it's not right to block the access in SPNEGO
> filter. We intend to check impersonation permission when the method
> "getRemoteUser" of request is used, so that such kind of links("/jmx,
> /stack") would not be blocked by mistake.
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