[rabbitmq-discuss] Disk node vs ram node

Alexis Richardson alexis at rabbitmq.com
Fri Aug 13 15:40:14 BST 2010


One of the things on our todo list, as you can imagine, is to
understand how to best provide HA in a VM based setting.  Some VM
technologies provide useful failover / snapshot capability...


On Fri, Aug 13, 2010 at 3:36 PM, Dave Greggory <davegreggory at yahoo.com> wrote:
> Ouch... so no way to ensure that there's something to catch messages when the
> node with the original durable queue goes down?
> There are several mentions throughout the site about out-of-the-box live
> failover in future release, how far out is that? 6 months? 1 year?
> Not a big fan of the pacemaker approach due to the number of moving parts and
> different packages (pacemaker/corosync/heartbeat/erbd) to maintain and manage.
> And also haven't seen any indication of people actually using that setup in a
> complex VM environment in production.
> ----- Original Message ----
> From: Alexandru Scvorţov <alexandru at rabbitmq.com>
> To: Dave Greggory <davegreggory at yahoo.com>
> Cc: "rabbitmq-discuss at lists.rabbitmq.com" <rabbitmq-discuss at lists.rabbitmq.com>
> Sent: Thu, August 12, 2010 9:33:54 AM
> Subject: Re: [rabbitmq-discuss] Disk node vs ram node
> Hi Dave,
>> When a node with a queue goes down, can I write something using the java client
>>that re-declares all known queues on the other node. May be have all the queue
>>names(and params) registered somewhere in the app and upon reconnect, passively
>>re-declare them. If passive declaration throws an exception, catch that and do
>>an actual declaration. Would that work?
> If you:
>  1) declare a durable queue on one of the clustered nodes,
>  2) take down that node,
>  3) declare the same queue on another node
> you get a "404: Not Found".
> If it's not durable, sure.
> As an aside, if you passive declare something, then immediately declare
> it, the first step is redundant.  There's no problem with declaring
> the same thing repeatedly. (assuming it's declared in exactly the
> same way and it's not unreachable)
> Cheers,
> Alex
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