Rohith commented on YARN-2442:

Apologies for looking back after very long time. 
IMHO, some customers has use case of using JMX for monitoring the daemons. When 
there is system similar to Ambari i.e Hadoop Cluster Operation Manager uses JMX 
for monitoring the daemons like healtch check service. Such systems start the 
daemons with JMX enabled mode default. Currently, ClusterMetrics, QueueMetrics 
and RMNMInfor are registered with JMX and these metrics are able to retrieve 
from using JMX. Similarly, If there there is another MBean for RMInfoMbean and 
register with basic RM info such as state,securityEnabled and other required RM 
attributes would be helpfull for JMX dependent users. This is very similar to 
HDFS NameNodeStatusMXBean.

Kindly give your opinion, thoughts on this. 

> ResourceManager JMX UI does not give HA State
> ---------------------------------------------
>                 Key: YARN-2442
>                 URL: https://issues.apache.org/jira/browse/YARN-2442
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: resourcemanager
>    Affects Versions: 2.5.0
>            Reporter: Nishan Shetty
>            Assignee: Rohith
> ResourceManager JMX UI can show the haState (INITIALIZING, ACTIVE, STANDBY, 

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