Apache9 commented on pull request #3339:
URL: https://github.com/apache/hbase/pull/3339#issuecomment-851750997


   OK, I think this is the problem.
   
   2021-05-31 16:15:08,227 INFO  
[RpcServer.default.FPBQ.Fifo.handler=1,queue=0,port=41365] 
balancer.StochasticLoadBalancer(458): start StochasticLoadBalancer.balancer, 
initCost=NaN, functionCost=RegionCountSkewCostFunction : (500.0, 0.0); 
PrimaryRegionCountSkewCostFunction : (not needed); MoveCostFunction : (7.0, 
0.0); ServerLocalityCostFunction : (25.0, 0.0); RackLocalityCostFunction : 
(15.0, 0.0); TableSkewCostFunction : (35.0, 1.0); RegionReplicaHostCostFunction 
: (not needed); RegionReplicaRackCostFunction : (not needed); 
ReadRequestCostFunction : (5.0, NaN); WriteRequestCostFunction : (5.0, NaN); 
MemStoreSizeCostFunction : (5.0, NaN); StoreFileCostFunction : (5.0, 0.0);  
computedMaxSteps: 9600
   
   The region load related cost functions all return NaN, which makes the 
balancer broken. Let me dig more.


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