[rabbitmq-discuss] can I create multiple channel for multiple thread work?

[sam_mis]

Hi All

I have a problem/doubt with a rabbit queue .i used only one AMQP connection
and create the no. channels in respect to no. of thread.I need that 25
threads consume one rabbit queue.my publisher can put message onto the queue
and my thread consumer are listen the queue and do some processing on
message and again publish the process message into another queue,after
completion the above process he acknowledge.also i am using the
channel.basicQos(1), one thread can get only one message until it
not acknowledge.
it is correct way to do that?
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[Rob Harrop]

Creating a single connection and having ~25 channels will be perfectly
fine.

I recommend using QueueingConsumer for each of the consumers on these
channels to prevent any possible deadlock problems.

Setting channel.basicQos(1) will mean that your consumers get
approximately fair distribution of the work, but you should ensure that
you are using autoAck=false when setting up the consumer otherwise QoS
settings are ignored.

Rob

On 04/03/11 05:51, sam_mis wrote:
> Hi All
>
> I have a problem/doubt with a rabbit queue .i used only one AMQP connection
> and create the no. channels in respect to no. of thread.I need that 25
> threads consume one rabbit queue.my publisher can put message onto the queue
> and my thread consumer are listen the queue and do some processing on
> message and again publish the process message into another queue,after
> completion the above process he acknowledge.also i am using the
> channel.basicQos(1), one thread can get only one message until it
> not acknowledge.
> it is correct way to do that?

_______________________________________________

[sam_mis]

I have some doubt when the threads are reading messages from a queue.i want
to make it sure that one message is will be read by only one thread not
twice again.Is it required some other configuration ?

Thanks

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[Gavin M. Roy]

What client library are you using?

[sam_mis]

I am using rabbitmq-java-client-2.0.0.

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[Rob Harrop]

If all the consumers are attached to the same queue then only one of them will see a given message from that queue.

The number of threads involved has no bearing on this. If you are seeing unexpected behaviour you should check that multiple copies of a message are not finding their way into the queue. Also, you should try upgrading to the latest Java client.

Regards,

Rob