[jira] [Created] (HBASE-25790) NamedQueue 'BalancerRejection' for recent history of balancer skipping

["Zhuoyue Huang (Jira)" <ji...@apache.org>]

Zhuoyue Huang created HBASE-25790:
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             Summary: 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


[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}




 



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