feat: replace thread-per-consumer pub/sub with async receive pool - #1065
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Eliminate the thread-per-consumer model that causes thread exhaustion at scale (40+ workspaces × 4 flows ≈ 480 OS threads) by migrating to pulsar.asyncio.Client with fully async receive loops. Core infrastructure: - Add AsyncPulsarBackend using pulsar.asyncio.Client for native async - Add ReceiverPool: shared work queue with configurable worker count - Add SenderPool: async producer dispatch with drain-on-stop - Add RequestResponseClient with streaming support (request_stream) - Add AsyncConfigClient and AsyncRequestResponseWrapper for service use Migration: - Migrate all core services to AsyncProcessor (config, flow, IAM, librarian, cores, bootstrapper, metering) - Replace Subscriber/Consumer inheritance with ReceiverPool registrations - Replace Producer send with SenderPool handles - Use BaseException throughout for pulsar.asyncio.PulsarException compatibility (inherits BaseException, not Exception) - Close-before-cancel shutdown pattern for async Pulsar consumers Includes tech spec: docs/tech-specs/async-receive-threading.md
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Eliminate the thread-per-consumer model that causes thread exhaustion at scale (40+ workspaces × 4 flows ≈ 480 OS threads) by migrating to pulsar.asyncio.Client with fully async receive loops.
Core infrastructure:
Migration:
Includes tech spec: docs/tech-specs/async-receive-threading.md