Messages lost or messages aren't consumed

[Viviane Oliveira]

Hi!

I don't know what is happening very well. After I publish a message in a queue, this message is never consumed, but the message is lost from the queue. I wrote many log messages before to publish and when get the consumer. I can see the log messages from the publisher, but I don't see them in the consumer.

Is there any possibility that this happen?

Thanks,

Viviane

[Wesley Peng]

hello

On 2019/11/14 7:40 下午, Viviane Oliveira wrote:
> I don't know what is happening very well. After I publish a message in a
> queue, this message is never consumed, but the message is lost from the
> queue. I wrote many log messages before to publish and when get the
> consumer. I can see the log messages from the publisher, but I don't see
> them in the consumer.
>
>

Before the community can help you, we must know this information:

Version of Erlang and RabbitMQ
Operating system and version
RabbitMQ configuration files
RabbitMQ log files, or log file entries
Exact error output
Exact commands you are running, or code you are running

regards

[Viviane Oliveira]

3.7.5Erlang 20.3.8.5

Linux

I have no error messages.

[Wesley Peng]

On 2019/11/14 7:40 下午, Viviane Oliveira wrote:

> I don't know what is happening very well. After I publish a message in a
> queue, this message is never consumed, but the message is lost from the
> queue. I wrote many log messages before to publish and when get the
> consumer. I can see the log messages from the publisher, but I don't see
> them in the consumer.

Just my guess, they may be in broker always but don't get consumed due
to some configure or code issues, for example, the routing key not matched.

regards.

[Luke Bakken]

Hello,

Please see my response here: https://stackoverflow.com/questions/58856030/messages-lost-or-messages-arent-consumed

If RabbitMQ can't route a message to a queue, it is dropped. You should be publishing using publisher confirms so that this case is reported back to your application. I'm not sure how this is done using Spring.

Thanks,

Luke

[Wesley Peng]

Thanks Luke for this help.

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[Eyal Herlin]

Hi Luke, 

I'm new to RabbitMQ and I'm working on making our Rabbit code more resilient.

So, regarding your answer:

If I use publisher confirms won't I just get an Ack?

If so, how will that help me know the message was unroutable?

Am I missing something or did I misunderstand your answer?

I thought the only way to know a message was not routed is to set it to be mandatory and have the publisher handle basic.return.

Thanks,

Eyal

so that this case is reported back to your application.

[Gary Russell]

You should enable returns as well as confirms; I answered the stack overflow question.

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[Eyal Herlin]

Thanks a lot Gary.

I really appreciate the quick reply and clarification.

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