beginnerBuilding the Producer Microservice
Why send Kafka messages asynchronously (with a callback) rather than blocking on every `send()` call?
Blocking on every send serializes your throughput to the network round-trip time per message, which is far slower than Kafka is capable of. Sending asynchronously with a callback for success/failure lets the producer batch and pipeline many in-flight sends at once, dramatically increasing throughput, while still letting you react to failures per-message.
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