leventov opened a new issue #8357: Use concurrency-limits for adaptive query processing admission queue sizing URL: https://github.com/apache/incubator-druid/issues/8357 Druid's Historicals, Indexing Peons, Brokers, and Routers could leverage https://github.com/Netflix/concurrency-limits to auto-tune query queue size. See [this blog post](https://medium.com/@NetflixTechBlog/performance-under-load-3e6fa9a60581) for the explanation. concurrency-limits library is one of the successors (along with [resilience4j](https://github.com/resilience4j/resilience4j)) of Netflix Hystrix which was previously brought to the community attention [here](https://groups.google.com/d/msg/druid-development/hysR5udgmpI/n6VfYZ1dAQAJ) and [here](https://github.com/apache/incubator-druid/issues/7390#issuecomment-508947803) by @sashidhar. However, Hystrix is now in the maintenance mode so if Druid was to adopt any of these libraries, they should be concurrency-limits and/or resilience4j rather than Hystrix.
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