[GitHub] [druid] capistrant commented on issue #9816: Historical rack aware (or group aware) data replication

[GitBox <gi...@apache.org>]

capistrant commented on issue #9816:
URL: https://github.com/apache/druid/issues/9816#issuecomment-716614390


   for a case where number of groups or racks = number of replicas desired, sure. But a large enterprise cluster will have 10s of racks and will not want a replica on every rack due to cost concerns. And trying to automatically generate load rules that properly balance datasources across those groups by selecting tiers would be burdensome and likely hard to do well.


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