Clara Xiong created HBASE-26327:
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Summary: 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
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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