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Zhuoyue Huang commented on HBASE-25790: --------------------------------------- Have created PR against branch-2. The screenshot below shows how the result lool like after we run this command !image-2021-05-08-17-33-21-753.png! > NamedQueue 'BalancerRejection' for recent history of balancer skipping > ---------------------------------------------------------------------- > > Key: HBASE-25790 > URL: https://issues.apache.org/jira/browse/HBASE-25790 > Project: HBase > Issue Type: Sub-task > Components: Balancer, master > Reporter: Zhuoyue Huang > Assignee: Zhuoyue Huang > Priority: Major > Fix For: 3.0.0-alpha-1, 2.5.0, 2.4.3 > > Attachments: image-2021-05-08-17-33-21-753.png > > > [HBASE-24528|https://issues.apache.org/jira/browse/HBASE-24528] implements a > NamedQueue that saved recent history of balancer decision details. Since we > want to know exactly why the balancer is skipping to run, we need a new > namedQueue called 'BalancerRejection' to hold the history of all details > information why the balancer was rejected to run(skipping). LogEntry of > 'BalancerRejection' should contain the information below: > 1. Reason, to show why this time balancer was rejected > Maybe look like: > > {code:java} > (cost1*multiplier1+cost2*multiplier2+...+costn*multipliern)/sumMultiplier=0.025 > <= minCostNeedBalance(0.35) > {code} > 2. Detail cost factors and multipliers > Maybe look like: > {code:java} > org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer$RegionCountSkewCostFunction > cost:0.0 multiplier:500.0 > org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer$MoveCostFunction > cost:0.0 multiplier:7.0 > org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer$RackLocalityCostFunction > cost:1.0 multiplier:15.0 > {code} > -- This message was sent by Atlassian Jira (v8.3.4#803005)