Sean Busbey created HBASE-24138:
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Summary: Ensure StochasticLoadBalancer can log details of decision
to not run balancer
Key: HBASE-24138
URL: https://issues.apache.org/jira/browse/HBASE-24138
Project: HBase
Issue Type: Task
Components: Balancer, Operability
Reporter: Sean Busbey
Assignee: Sean Busbey
Ran into a customer case where the StochasticLoadBalancer was consistently
deciding not to balance when bringing new region servers on line. Even setting
the class to TRACE logging would only log a summary statement like:
{code}
2020-04-03 00:29:55,133 TRACE
org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer: Skipping load
balancing because balanced cluster; total cost is 25.24853189705185, sum
multiplier is 602.0 min cost which need balance is 0.05
{code}
Without any details about what went into that decision it's really hard to
figure out if what we need to tune to get the behavior we want.
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