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https://issues.apache.org/jira/browse/YARN-4837?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15200838#comment-15200838
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Rohith Sharma K S commented on YARN-4837:
-----------------------------------------

Adding to discussion about AM blacklisting, there are few corner cases where 
application can get hanged forever. Especially after blacklisting some nodes, 
if other nodes removed from the cluster. In such cases, there is no mechanism 
such that to remove blacklisted nodes for AM. See YARN-4685 for one of the 
scenario.

> User facing aspects of 'AM blacklisting' feature need fixing
> ------------------------------------------------------------
>
>                 Key: YARN-4837
>                 URL: https://issues.apache.org/jira/browse/YARN-4837
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Vinod Kumar Vavilapalli
>            Assignee: Vinod Kumar Vavilapalli
>
> Was reviewing the user-facing aspects that we are releasing as part of 2.8.0.
> Looking at the 'AM blacklisting feature', I see several things to be fixed 
> before we release it in 2.8.0.



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