leventov edited a comment on issue #7186: Caffeine-based remote cache with adaptive admission windows URL: https://github.com/apache/incubator-druid/issues/7186#issuecomment-469402364 Segments are served by multiple historicals, and although currently Brokers almost never take advantage of that, there are multiple reasons why they should start query different historicals more often (identified, for example, in [this post](https://medium.com/@leventov/the-problems-with-druid-at-large-scale-and-high-load-part-1-714d475e84c9), and also mentioned in the issue about [online aggregation](https://github.com/apache/incubator-druid/issues/7087)). Thus the same segment might have separate be tracked in several independent admission windows on different historicals. If this is a big obstacle for the idea and how it can be solved (randomization?) is yet to be determined.
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