Publisher confirms so mehanizem, s katerim RabbitMQ potrdí proizvajalcu, da je prejel (in trajno shranil) sporočilo — kar zagotavlja, da sporočila niso izgubljena na strani produkcije. So ustreza na strani proizvajalca potrditvam na strani potrošnika.
Problem: je sporočilo doseglo brokera?
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
Kako publisher confirms delujejo
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
