Masstransit 如何处理慢消费者

Question

I am using Masstransit 7.0.0 with consumer to process the messages from RabbitMQ. I have observed when the consumer is slow processing the message or when I put the debug point in visual studio for consumer, after some time my consumer receives the message again. My assumption is Masstransit thought consumer crashed and sent the message again.

In my case, my consumer is some times slow processing the message as it talks to external endpoints but the processing is around 30-40 seconds and not minutes.

Could you please explain How masstransit knows the consumer is crashed( or whatever it is) to resend the message? If it waits for certain amount of time waiting for ack, then Is there setting anywhere just to increase this time little bit specific to queue/consumer?

Thanks

Answer 1

With RabbitMQ, there is no timeout after which the message would be redelivered. If you are stopping the consumer in the debugger, you are likely causing the RabbitMQ socket connection to close. When the connection is closed, MassTransit will reconnect at which point any messages not previously acknowledged would be redelivered.

In normal operation, consumers that take 30, 60, 90, even 300 seconds are rarely an issue as the broker connection is maintained.