Confirmation on message ordering sequence

[springusr]

If we send messages like below using rabbit template, I believe its not guaranteed to deliver in order they sent (because it might not use same channel), please confirm.

 for (int i = 1; i <= 25; i++) {
 rabbitTemplate.convertAndSend("testQ", message);
 }

[Michael Klishin]

RabbitMQ will sent confirmations [1] in the same order but can acknowledge multiple messages
at once. I can't comment on Spring AMQP. Spring AMQP folks take questions on Stack Overflow labelled
with "spring-amqp."

1. https://www.rabbitmq.com/confirms.html 

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MK

Staff Software Engineer, Pivotal/RabbitMQ

[Gary Russell]

Yes, channels are cached between template operations and there is no guarantee that the same channel will be used in that scenario.

The upcoming 2.0 release of Spring AMQP has a new mechanism to perform multiple tasks on the same channel [1].

For example:

Collection<?> messages = getMessagesToSend();

Boolean result = this.template.invoke(t -> {

    messages.forEach(m -> t.convertAndSend(ROUTE, m));

    t.waitForConfirmsOrDie(10_000);

    return true;

});

It is guaranteed that the same channel is used in that case.

This will be available in the next milestone in a couple of weeks (it's in the BUILD-SNAPSHOT now).

With earlier releases you would have to use template.execute() with a ChannelCallback and use channel.basicPublish() calls within the scope of the callback.

[1]: http://docs.spring.io/spring-amqp/docs/2.0.0.BUILD-SNAPSHOT/reference/html/_reference.html#scoped-operations

On Thu, Mar 9, 2017 at 6:05 PM, Michael Klishin <mkli...@pivotal.io> wrote:

RabbitMQ will sent confirmations [1] in the same order but can acknowledge multiple messages
at once. I can't comment on Spring AMQP. Spring AMQP folks take questions on Stack Overflow labelled
with "spring-amqp."

1. https://www.rabbitmq.com/confirms.html 

On 10 March 2017 at 02:02:34, springusr (patelm...@gmail.com) wrote:
> If we send messages like below using rabbit template, I believe its not
> guaranteed to deliver in order they sent (because it might not use same
> channel), please confirm.
>
> for (int i = 1; i <= 25; i++) {
> rabbitTemplate.convertAndSend("testQ", message);
> }
>
> --
> You received this message because you are subscribed to the Google Groups "rabbitmq-users"
> group.

> To unsubscribe from this group and stop receiving emails from it, send an email to rabbitmq-users+unsubscribe@googlegroups.com.
> To post to this group, send an email to rabbitmq-users@googlegroups.com.

> For more options, visit https://groups.google.com/d/optout.
>

--
MK

Staff Software Engineer, Pivotal/RabbitMQ

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