[rabbitmq-discuss] Data is feteched from the queue in random order
matthias at rabbitmq.com
Thu Apr 21 12:25:13 BST 2011
On 20/04/11 10:30, Kamal wrote:
> I am trying to dequeue data from the RabbitMQ. Why is it so that the
> data is not dequeued in the same order in which it was enqueued into
> the queue?
See section 4.7 for the AMQP 0-9-1 spec for the ordering guarantees provided
contents flowing through a single path within the server will remain
ordered. For contents of a given priority flowing through a single path,
we define a content processing path as consisting of one incoming
channel, one exchange, one queue, and one outgoing channel.
Guidelines for implementors:
The server MUST preserve the order of contents flowing through a
single content processing path, unless the redelivered field is set on
the Basic.Deliver or Basic.Get-Ok methods.
> Following is the block of code that I am using to dequeue:
The code itself looks fine, but the context in which this code is
invoked is important. The most common cause of re-ordering is when a
consumer is terminated prior to acknowledging all the messages it has
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