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https://issues.apache.org/jira/browse/HBASE-21338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16659815#comment-16659815
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Xu Cang edited comment on HBASE-21338 at 10/22/18 11:30 PM:
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Config for this class is auto-reloadable.
[https://github.com/apache/hbase/blob/master/hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.java#L162]
Also, to overcome above mentioned issue, just need to set
"hbase.master.balancer.stochastic.runMaxSteps" to true.
I added some logging including a WARN message when computedMaxSteps is greater
than maxSteps.
was (Author: xucang):
Config for this class is auto-reloadable.
[https://github.com/apache/hbase/blob/master/hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.java#L162]
Also, to overcome above mentioned issue, just need to set
"hbase.master.balancer.stochastic.runMaxSteps" to true.
I added some logging including a WARN message to code when computedMaxSteps is
greater than maxSteps.
> [balancer] If balancer is an ill-fit for cluster size, it gives little
> indication
> ---------------------------------------------------------------------------------
>
> Key: HBASE-21338
> URL: https://issues.apache.org/jira/browse/HBASE-21338
> Project: HBase
> Issue Type: Sub-task
> Components: Balancer
> Reporter: stack
> Assignee: Xu Cang
> Priority: Major
> Attachments: HBASE-21338.master.001.patch
>
>
> See parent issue. Running balancer on a cluster where the max steps was way
> inadequate, the balancer gave little to no indication that it was
> ill-configured. In fact, it only logged its starting and then that there was
> nothing to do though the cluster was obviously out-of-whack.
> Ideally the balancer would complain when say the maxSteps limit is a small
> fraction of what the cluster's calculated max steps are, or it would notice
> that the balancer is making little progress on an imbalanced cluster and
> shout. Can we set balancer configs w/o having to restart Master?
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