[rabbitmq-discuss] consumer get messages from one queue sometimes disorder

Xie Yunpeng woqimingweipeng at gmail.com
Tue May 7 11:26:32 BST 2013

thx, i will do some test and analyse log to verify the second condition.i
think it is the real reason.

2013/5/7 Simon MacMullen <simon at rabbitmq.com>

> On 07/05/2013 09:26, Emile Joubert wrote:
>> On 06/05/13 11:08, Xie Yunpeng wrote:
>>  I use 4 publisher sending messages to this queue and 1 consumer to
>>> receive the messages.the consumer when connect to the rabbitmq server ,
>>  i find it receive messages disorder sometimes, just like: first receive
>>> messges in current time and then receive messages several hour ago, the
>>> interval is not regular.
>> You can find the ordering guarantees here:
>> http://www.rabbitmq.com/**semantics.html#ordering<http://www.rabbitmq.com/semantics.html#ordering>
>> In particular, there is no ordering guarantee if you involve multiple
>> publishers.
> Well, there's still exactly the same ordering guarantee as there is with a
> single publisher: messages from each publishing channel won't get reordered
> with respect to each other. We just don't guarantee anything about ordering
> between channels. And indeed it's hard to see how we could.
> To the OP: either something weird is happening in your publishers causing
> them to buffer messages for hours before sending to RabbitMQ (unlikely I
> guess but I should mention it) or messages are not being acknowledged by
> your consumers and are then being requeued once the consumer disconnects.
> In the latter case all the "late" messages should have the "redelivered"
> flag set.
> Cheers, Simon
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