yuanboliu commented on PR #6861:
URL: https://github.com/apache/hadoop/pull/6861#issuecomment-2148757966

   @slfan1989 Thanks for your reply. The major idea is that  follower 
sub-clusters are considerred as backup clusters, we don't use them until leader 
subcluster not working at all. hdfs has HA state and replications and ensure 
disaster tolerance within cluster. We're using this mode to make cross-cluster 
disaster tolerance work, so clients don't have to wait until the major cluster 
recovering, which takes long time.
   So basically this mode is not about using RBF to share overloading, but 
implement some kind of crosss-cluster disaster tolerance.


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