[jira] [Commented] (HBASE-21338) [balancer] If balancer is an ill-fit for cluster size, it gives little indication

["Hudson (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-21338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16680309#comment-16680309 ] 

Hudson commented on HBASE-21338:
--------------------------------

SUCCESS: Integrated in Jenkins build HBase-1.3-IT #500 (See [https://builds.apache.org/job/HBase-1.3-IT/500/])
HBASE-21373 (backport from HBASE-21338) Warn if balancer is an ill-fit (apurtell: rev 6f53424f8111b41fada49454d3bfe141007d9104)
* (edit) hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.java


> [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, Operability
>            Reporter: stack
>            Assignee: Xu Cang
>            Priority: Major
>             Fix For: 3.0.0, 2.2.0, 2.1.1, 2.0.3
>
>         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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