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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