Github user Chaos-Ju commented on the issue:

    https://github.com/apache/spark/pull/19206
  
    @vanzin @srowen thanks your notice  and comment, I means that if make 
Yarn Cluster know about the federated HDFS service, We should distribute the 
mount table XML in the cluster and by restart Yarn Cluster bring into effect.  
under this circumstances,if We change the mount table or HA settings,we 
should  restart Yarn Cluster again.  In addition,I dont think this is  a 
bug,but its a feature . if it is possible,We can make Yarn no need to know 
about the federated HDFS service like MR & Hive
    
    
     


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