[rabbitmq-discuss] RabbitMQ failover and message loss

[Radha Krishnan D]

Hi,

 

I have 2 brokers clustered with each other.  They are load balanced by
having a HA proxy before them.

Let us call the brokers as B1 and B2.

 

The HAproxy is in the same machine as B1.

 

The producer P1 and consumer C1 are on different machines.

 

The model we are using is amq.direct  and all the messages are non
persistent. All our  messages are mandatory=true and immediate=false.

 

Initially we start the broker B1 alone.  The broker B2 is down.

We start P1 and C1. They are now connected to the broker B1. 

We start C1 and then P1. after 3-4 seconds, we start B2.

After B2 starts, We immediately crash B1. 

Now both P1 and C1 get connected to B2 and the test continues till we
stop all three.

 

Now, during the failover time we find message losses.

 

Is it expected  or can we make sure that no message gets lost.

 

 

Also, when will be  channel.setReturnListener  called ? 

Will it be called when the message does not reach the queue from the
exchange or when the message does reach the consumer from the queue ?

 

 

In the clustered mode, exchanges are global across rabbitmq nodes .. are
the queues also global ?

Please clear us. We are confused about the global nature of queues !! 

 

 

 

 

Thanks and Regards,

D.Radhakrishnan
Trainee Engineer-Architecture

IVY Comptech Private Limited
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Hyderabad-500034, Andhra Pradesh. 

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