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https://issues.apache.org/jira/browse/YARN-4685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15282415#comment-15282415
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Rohith Sharma K S commented on YARN-4685:
-----------------------------------------

Since this issue is introduced by YARN-2005 and committed to branch-2.8, should 
YARN-2005 reverted as long as right solution is decided??. One biggest 
challenge to revert is many patches are committed on top of YARN-2005. 
OR should we go ahead with changing threshold to 0.2 default for 2.8 release? 
Any thoughts

> AM blacklisting result in application to get hanged
> ---------------------------------------------------
>
>                 Key: YARN-4685
>                 URL: https://issues.apache.org/jira/browse/YARN-4685
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.8.0
>            Reporter: Rohith Sharma K S
>            Assignee: Rohith Sharma K S
>            Priority: Critical
>
> AM blacklist addition or removal is updated only when RMAppAttempt is 
> scheduled i.e {{RMAppAttemptImpl#ScheduleTransition#transition}}. But once 
> attempt is scheduled if there is any removeNode/addNode in cluster then this 
> is not updated to {{BlackListManager#refreshNodeHostCount}}. This leads 
> BlackListManager to operate on stale NM's count. And application is in 
> ACCEPTED state and wait forever even if blacklisted nodes are reconnected 
> with clearing disk space.



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