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https://issues.apache.org/jira/browse/HBASE-26308?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Duo Zhang resolved HBASE-26308.
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Fix Version/s: 2.5.0
3.0.0-alpha-2
2.4.9
Hadoop Flags: Reviewed
Resolution: Fixed
> Sum of multiplier of cost functions is not populated properly when we have a
> shortcut for trigger
> -------------------------------------------------------------------------------------------------
>
> Key: HBASE-26308
> URL: https://issues.apache.org/jira/browse/HBASE-26308
> Project: HBase
> Issue Type: Sub-task
> Components: Balancer
> Reporter: Clara Xiong
> Assignee: Clara Xiong
> Priority: Critical
> Fix For: 2.5.0, 3.0.0-alpha-2, 2.4.9
>
>
> We have a couple of scenarios that we force balancing:
> * idle servers
> * co-hosted regions
> The code path quit before populating the sum of multiplier of cost functions.
> This causes wrong value reported in logging. As below, the weighted average
> is not divide by total weight. This causes inconsistent log among iterations.
> {quote}2021-09-24 21:46:57,881 INFO
> org.apache.hadoop.hbase.master.balancer.S*tocha*sticLoadBalancer: Running
> balancer because at least one server hosts replicas of the same region.
> 2021-09-24 21:46:57,881 INFO
> org.apache.hadoop.hbase.master.balancer.S*tocha*sticLoadBalancer: Start
> S*tocha*sticLoadBalancer.balancer, initial weighted average
> imbalance=6389.260497305375, functionCost=RegionCountSkewCostFunction :
> (multiplier=500.0, imbalance=0.06659036267913739);
> PrimaryRegionCountSkewCostFunction : (multiplier=500.0,
> imbalance=0.05296760285663541); MoveCostFunction : (multiplier=7.0,
> imbalance=0.0, balanced); ServerLocalityCostFunction : (multiplier=25.0,
> imbalance=0.46286750487559114); RackLocalityCostFunction : (multiplier=15.0,
> imbalance=0.2569525347374165); TableSkewCostFunction : (multiplier=500.0,
> imbalance=0.3760689783169534); RegionReplicaHostCostFunction :
> (multiplier=100000.0, imbalance=0.0553889913899139);
> RegionReplicaRackCostFunction : (multiplier=10000.0,
> imbalance=0.05854089790897909); ReadRequestCostFunction : (multiplier=5.0,
> imbalance=0.06969346106898068); WriteRequestCostFunction : (multiplier=5.0,
> imbalance=0.07834116112410174); MemStoreSizeCostFunction : (multiplier=5.0,
> imbalance=0.12533769793201735); StoreFileCostFunction : (multiplier=5.0,
> imbalance=0.06921401085082914); computedMaxSteps=5577401600
> {quote}
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