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https://issues.apache.org/jira/browse/HBASE-26327?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Duo Zhang resolved HBASE-26327.
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Fix Version/s: 2.5.0
3.0.0-alpha-2
2.4.9
Hadoop Flags: Reviewed
Resolution: Fixed
> Replicas cohosted on a rack shouldn't keep triggering Balancer
> --------------------------------------------------------------
>
> Key: HBASE-26327
> URL: https://issues.apache.org/jira/browse/HBASE-26327
> Project: HBase
> Issue Type: Sub-task
> Components: Balancer
> Reporter: Clara Xiong
> Assignee: Clara Xiong
> Priority: Major
> Fix For: 2.5.0, 3.0.0-alpha-2, 2.4.9
>
>
> Currently, Balancer has a shortcut check for cohosted replicas of the same
> region/host/rack and will keep triggering balancer if it is non-zero.
> With the trending of kube and cloud solution for HBase, operators don't have
> full control of the topology or are not even aware of the topology. There are
> cases that it is not possible to satisfy or requires sacrificing other
> constraints such as region count balancing on RS. We want to keep there per
> RS/host check for availability of regions, especially for meta region. We
> haven't heard problem with rack so far. The cost functions will still be
> considered during balancing.
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