GitHub user dimas-b added a comment to the discussion: Feasibility of 1 Realm 
per Tenant at 10,000 Tenants Scale?

@lawrenz1 : if you're planning to use existing ASF Polaris images, please note 
that the set of allowed realm IDs currently [has to be 
configured](https://github.com/apache/polaris/blob/20febdaede19fb7c46e120652fdd1a262c2138e4/runtime/service/src/main/java/org/apache/polaris/service/context/DefaultRealmContextResolver.java#L54)
 on catalog startup via the `polaris.realm-context.realms` configuration 
option. Putting 10K realms there does not seem practical to me.

That said, I believe Polaris can be enhanced to support many realms without 
restart/reconfig, but that will require either a custom downstream build or 
some OSS code changes.

GitHub link: 
https://github.com/apache/polaris/discussions/4761#discussioncomment-17314955

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