[rabbitmq-discuss] RabbitMQ clustering and node failure recovery strategies

Thu Oct 7 10:58:13 BST 2010

That helps, thanks! What do you mean by maskerading? Is cloning
IP/hostname/cookie enough? How about Mnesia?

Alexandru Scvorţov wrote:
> 
> Hi,
> 
>> I have been reading the mailing list to gather information about
>> scalable
>> and HA configurations for RabbitMQ. From my understanding, I assune
>> that if
>> a RabbitMQ node in a cluster fails all the queues and messages on that
>> node
>> will be lost until the node is not recovered and any attempt of
>> re-creating
>> the queues on another node is forbidden by the cluster implementation.
>> Is
>> still the case in the latest RabbitMQ release?
> 
> We're talking about durable queues.  Yes, this is still the case with
> the latest broker.  You can't recreate the lost queue on a different
> node
> because it causes all sorts of problems if the original node comes back
> up.
> 
>> I was thinking about fail-over strategies and I was wondering if there
>> is
>> any way to say to the cluster to forget about the binding
>> (queue-cluster
>> node) after the failure. If I did that, then I could re-create the
>> queue on
>> another node.
> 
> The only way to remove a queue from a downed node is either to restart
> the node and remove the queue, or have another node masquerade as that
> node and remove it.  In the second case, you lose the messages.
> 
> If you don't care about losing some messages, you can just use
> non-durable queues.  This way, when the node goes down, the queue is
> deleted from the cluster and can be redeclared on any other node.  Of
> course, whatever messages were on the queue are lost.
> 
> Does this help?
> 
> Cheers,
> Alex
> 
> 
> On Wed, Oct 06, 2010 at 02:26:57AM -0700, Armax wrote:
>> 
>> Hi,
>> 
>> I have been reading the mailing list to gather information about scalable
>> and HA configurations for RabbitMQ. From my understanding, I assune that
>> if
>> a RabbitMQ node in a cluster fails all the queues and messages on that
>> node
>> will be lost until the node is not recovered and any attempt of
>> re-creating
>> the queues on another node is forbidden by the cluster implementation. Is
>> still the case in the latest RabbitMQ release?
>> 
>> I was thinking about fail-over strategies and I was wondering if there is
>> any way to say to the cluster to forget about the binding (queue-cluster
>> node) after the failure. If I did that, then I could re-create the queue
>> on
>> another node. 
>> 
>> If this is not available, is there a specific reason why this is not
>> possible?
>> 
>> Many thanks and keep up the good work :)
>> -- 
>> View this message in context:
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>> Sent from the RabbitMQ mailing list archive at Nabble.com.
>> 
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> 
> 

-- 
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