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https://issues.apache.org/jira/browse/HBASE-28513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17905631#comment-17905631
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Ray Mattingly commented on HBASE-28513:
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I've written up a proposal for balancer conditionals
[here|https://docs.google.com/document/d/1jA8Ghs86v7b-53j5DcsdbPnOXxbHjewkIBFi1E4S1pY/edit?usp=sharing]
I'll open up a PR shortly as well
> Secondary replica balancing squashes all other cost considerations
> ------------------------------------------------------------------
>
> Key: HBASE-28513
> URL: https://issues.apache.org/jira/browse/HBASE-28513
> Project: HBase
> Issue Type: Improvement
> Reporter: Ray Mattingly
> Priority: Major
>
> I have a larger write up available
> [here|https://gist.github.com/rmdmattingly/9db0885f9977234e56325beff566e749].
> Basically there are a few cost functions with relatively huge default
> multipliers. For example `PrimaryRegionCountSkewCostFunction` has a default
> multiplier of 100,000. Meanwhile things like StoreFileCostFunction have a
> multiplier of 5. Having any multiplier of 100k, while others are single
> digit, basically makes the latter category totally irrelevant from balancer
> considerations.
> I understand that it's critical to distribute a region's replicas across
> multiple hosts/racks, but I don't think we should do this at the expense of
> all other balancer considerations.
> For example, maybe we could have two types of balancer considerations: costs
> (as we do now), and conditionals (for the more discrete considerations, like
> ">1 replica of the same region should not exist on a single host"). This
> would allow us to prioritize replica distribution _and_ maintain
> consideration for things like storefile balance.
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