[jira] [Updated] (HBASE-24138) Ensure StochasticLoadBalancer can log details of decision to not run balancer

["Nick Dimiduk (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-24138?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Nick Dimiduk updated HBASE-24138:
---------------------------------
    Fix Version/s:     (was: 2.4.0)

> 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
>            Priority: Major
>             Fix For: 3.0.0-alpha-1, 2.3.0, 1.7.0, 2.2.5
>
>
> 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 what we need to tune to get the behavior we want.



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