Clara Xiong created HBASE-26308:
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Summary: 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: Bug
Components: Balancer
Reporter: Clara Xiong
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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