Publisher confirms एक mechanism है जहाँ RabbitMQ producer को acknowledge करता है कि उसने एक message प्राप्त (और persist) कर लिया है — यह सुनिश्चित करते हुए कि messages publishing side पर न खोएँ। ये consumer acknowledgments के producer-side counterpart हैं।
समस्या: क्या message broker तक पहुँचा?
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When a producer publishes a message, by default it doesn't KNOW if RabbitMQ received it:
→ network failure, broker issue → the message could be LOST without the producer knowing
→ for reliability, the producer needs CONFIRMATION that the message was accepted
→ publisher confirms address the PUBLISHING side of reliability
publisher confirms कैसे काम करते हैं
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PUBLISHER CONFIRMS → the broker sends an ACK back to the producer for each message:
→ enable confirm mode on the channel
→ the broker ACKs a message once it has taken responsibility (received it; for persistent
messages on durable queues → once persisted to disk)
→ NACK → the broker couldn't handle the message (the producer can retry)
→ the producer KNOWS each message was accepted (or not) → no silent loss