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e6cde72d2b
" Current admission control takes a permit when cql requests starts and releases it when reply is sent, but some requests may leave background work behind after that point (some because there is genuine background work to do like complete a write or do a read repair, and some because a read/write may stuck in a queue longer than the request's timeout), so after Scylla replies with a timeout some resources are still occupied. The series fixes this by passing the permit down to storage_proxy where it is held until all background work is completed. Fixes #4768 " * 'gleb/admission-v3' of github.com:scylladb/seastar-dev: transport: add a metric to follow memory available for service permit. storage_proxy: store a permit in a read executor storage_proxy: store a permit in a write response handler Pass service permit to storage_proxy transport: introduce service_permit class and use it instead of semaphore_units transport: hold admission a permit until a reply is sent transport: remove cql server load balancer