[GitHub] [hbase] busbey opened a new pull request #1455: HBASE-24138 log more details about balancer decisions for StochasticLoadBalancer

Wed, 08 Apr 2020 08:55:44 -0700 

busbey opened a new pull request #1455: HBASE-24138 log more details about 
balancer decisions for StochasticLoadBalancer
URL: https://github.com/apache/hbase/pull/1455
 
 
   Based on logs needed when troubleshooting some balancer decisions.
   
   when the log level on `StochasticLoadBalancer` is set to DEBUG messages look 
like this:
   ```
   2020-04-08 09:57:39,515 DEBUG [Time-limited test] 
balancer.StochasticLoadBalancer$RegionCountSkewCostFunction(1196): 
RegionCountSkewCostFunction sees a total of 3 servers and 9 regions.
   2020-04-08 09:57:39,527 DEBUG [Time-limited test] 
balancer.StochasticLoadBalancer(348): We need to load balance cluster; total 
cost=10005.833333333334, sum multiplier=10602.0; min cost/multiplier which 
needs balance is 0.05
   ```
   
   when it is TRACE it looks like:
   ```
   2020-04-08 10:49:48,416 DEBUG [Time-limited test] 
balancer.StochasticLoadBalancer$RegionCountSkewCostFunction(1196): 
RegionCountSkewCostFunction sees a total of 3 servers and 9 regions.
   2020-04-08 10:49:48,417 TRACE [Time-limited test] 
balancer.StochasticLoadBalancer$RegionCountSkewCostFunction(1200): 
RegionCountSkewCostFunction sees server 'server11855,19031,-1' has 3 regions
   2020-04-08 10:49:48,418 TRACE [Time-limited test] 
balancer.StochasticLoadBalancer$RegionCountSkewCostFunction(1200): 
RegionCountSkewCostFunction sees server 'server15849,14000,-1' has 3 regions
   2020-04-08 10:49:48,418 TRACE [Time-limited test] 
balancer.StochasticLoadBalancer$RegionCountSkewCostFunction(1200): 
RegionCountSkewCostFunction sees server 'server87321,54683,-1' has 3 regions
   2020-04-08 10:49:48,446 TRACE [Time-limited test] 
balancer.StochasticLoadBalancer(338): PrimaryRegionCountSkewCostFunction not 
needed
   2020-04-08 10:49:48,447 TRACE [Time-limited test] 
balancer.StochasticLoadBalancer(338): RegionReplicaHostCostFunction not needed
   2020-04-08 10:49:48,450 TRACE [Time-limited test] 
balancer.StochasticLoadBalancer(338): RegionReplicaRackCostFunction not needed
   2020-04-08 10:49:48,451 DEBUG [Time-limited test] 
balancer.StochasticLoadBalancer(348): We need to load balance cluster; total 
cost=10005.833333333334, sum multiplier=10602.0; min cost/multiplier which 
needs balance is 0.05
   2020-04-08 10:49:48,452 TRACE [Time-limited test] 
balancer.StochasticLoadBalancer(353): Balance decision detailed function 
costs=RegionCountSkewCostFunction : (500.0, 0.0); 
PrimaryRegionCountSkewCostFunction : (500.0, 0.0); MoveCostFunction : (7.0, 
0.0); ServerLocalityCostFunction : (25.0, 0.0); RackLocalityCostFunction : 
(15.0, 0.0); TableSkewCostFunction : (35.0, 0.16666666666666666); 
RegionReplicaHostCostFunction : (100000.0, 0.0); RegionReplicaRackCostFunction 
: (10000.0, 0.0); ReadRequestCostFunction : (10000.0, 1.0); 
CPRequestCostFunction : (5.0, 0.0); WriteRequestCostFunction : (5.0, 0.0); 
MemStoreSizeCostFunction : (5.0, 0.0); StoreFileCostFunction : (5.0, 0.0);
   ```

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