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https://issues.apache.org/jira/browse/MAPREDUCE-3760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13196403#comment-13196403
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Jason Lowe commented on MAPREDUCE-3760:
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I think "blacklisting" here means "unhealthy."  And it is true that unhealthy 
NMs are lumped together with healthy NMs in the Active Nodes count.  I believe 
part of the reasoning here is that Active means "actively heartbeating" which 
both healthy and unhealthy nodes do.  Probably more useful if we remove the 
unhealthy nodes from the Active count since you can already get to an unhealthy 
node list from the web UI via the unhealthy nodes count link.
                
> Blacklisted NMs should not appear in Active nodes list
> ------------------------------------------------------
>
>                 Key: MAPREDUCE-3760
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3760
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.1
>            Reporter: Ramya Sunil
>            Priority: Minor
>             Fix For: 0.23.1
>
>
> Blacklisted NMs appear in both "Active Nodes" and "Unhealthy nodes" on the RM 
> UI. This should be fixed.

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