anoopsjohn commented on issue #1511: HBASE-24139 : Balancer should avoid 
leaving idle region servers
URL: https://github.com/apache/hbase/pull/1511#issuecomment-614767979
 
 
   > > The Jira was discussing abt a cost function based change right? Or this 
way? Sorry read that some time back
   > 
   > We talked about this, but @symat pointed out that only benefit to making 
it a tunable cost function is the ability change how many new RS you can 
onboard before the balancer starts using them. In the case of wanting to 
onboard a group of RS at a time operators are better off just turning the 
balancer off while the RS are brought online and then turning it back on.
   > 
   > Personally I agree with this reasoning.
   
   Read those Jira level discussion later.  Ya make sense.. Thanks 

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