timmylicheng commented on pull request #1514:
URL: https://github.com/apache/ozone/pull/1514#issuecomment-730105995


   > Is this change compatible with the hadoop2.x client?
   > 
   > With OM we created OMTransport with two implementation:
   > 
   > * one for hadoop3 which used the failover proxy
   > * one for hadoop2 which is without failover proxy
   > 
   > I don't have the full context, but we may need a similar method here, too.
   
   @elek Hey Marton. I think the failover proxy here is a little different from 
OM's. Here we are retrying with IP addresses specified in SCM HA configurations 
to see who should be the current leader SCM to handle requests. It doesn't seem 
to involve hadoop version.


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