gianm commented on issue #7236: Further improve caching documentation. URL: https://github.com/apache/incubator-druid/pull/7236#issuecomment-472146765 Those are all good questions. I'm not sure what the exact tradeoff is between letting the broker use (but not populate) a remote cache. I am sure that for a big enough cluster it's a bad idea, since it would have the same problems that enabling cache population does. I think the setup you mentioned is a good one for most users, and if you're interested in doing a PR to add the recommendation to the doc, please do! I also think if we fix #5796 we should add to the recommendation that using an external cache is a good way to boost hit rates, if you don't mind the operational overhead of running the external cache. Doing a bulk get on historicals minimizes the overhead of pulling segments. Cache hit rate is still maximized. And we avoid the broker being a bottleneck.
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