Naganarasimha G R commented on YARN-4307:

>From the preliminary check, i presume its because 
>{{SchedulerApplicationAttempt.getBlacklistedNodes()}} => 
>{{appSchedulingInfo.getBlackListCopy()}} => {{return new 
>HashSet<>(this.userBlacklist)}} but not *amBlacklist*. 
Not sure whether when {{appSchedulingInfo.amBlacklist}} gets updated we need to 
update {{userBlacklist}} also. thoughts ?
cc/ [~vvasudev], 

> Blacklisted nodes for AM container is not getting displayed in the Web UI
> -------------------------------------------------------------------------
>                 Key: YARN-4307
>                 URL: https://issues.apache.org/jira/browse/YARN-4307
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager, webapp
>            Reporter: Naganarasimha G R
>            Assignee: Naganarasimha G R
> In pseudo cluster had 2 NM's  and had launched app with incorrect 
> configuration *./hadoop org.apache.hadoop.mapreduce.SleepJob 
> -Dmapreduce.job.node-label-expression=labelX  
> -Dyarn.app.mapreduce.am.env=JAVA_HOME=/no/jvm/here  -m 5 -mt 1200*.
> First attempt failed and 2nd attempt was launched, but the application was 
> hung. In the scheduler logs found that localhost was blacklisted but in the 
> UI (app& apps listing page) count was shown as zero and as well no hosts 
> listed in the app page. 

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