Open Stack

The history of the ZeroMQ driver has been quite weird, going through
stages where it completely did not work at all, to receiving a few
patches to make it work and it's risked being removed from the
oslo.messaging package a few times.

For a cluster at a smaller scale, I'd suggest sticking to RabbitMQ in
order to avoid dealing with problems which you'll be stuck with.  I
also don't think the CI at OpenStack does any testing for ZeroMQ.

https://wiki.openstack.org/wiki/ZeroMQ

On Mon, Aug 15, 2016 at 10:14 AM, William Josefsson
<william.josefson at gmail.com> wrote:
> thx Clint! okay I will stick to RabbitMQ for now. Do you know any good
> up2date guide for replacing RabbitMQ with ZeroMQ, or is the general
> documentation http://docs.openstack.org/developer/oslo.messaging/zmq_driver.html
>  have you tried this?
>
> I'm also not sure if the ZeroMQ support is here to stay, or whether it
> will be removed going forward. thx will
>
> On Mon, Aug 15, 2016 at 3:24 AM, Clint Byrum <clint at fewbar.com> wrote:
>> Excerpts from William Josefsson's message of 2016-08-14 15:39:06 +0800:
>>> Hi everyone,
>>>
>>> I see advice in replacing RabbitMQ with ZeroMQ. I've been running 2
>>> clusters Liberty/CentOS7 with RabbitMQ now for while. The larger
>>> cluster consists of 3x Controllers and 4x Compute nodes. RabbitMQ is
>>> running is HA mode as per:
>>> http://docs.openstack.org/ha-guide/shared-messaging.html#configure-rabbitmq-for-ha-queues.
>>>
>>
>> For 7 real computers, RabbitMQ is actually a better choice. You get
>> centralized management and the most battle-tested driver of all.
>>
>> ZeroMQ is meant to remove the bottleneck and SPOF of a RabbitMQ cluster
>> from much larger systems by making the data path for messaging directly
>> peer-to-peer, but it still needs a central matchmaker database. So at
>> that scale, you're not really winning much by using it.
>>
>> I can't really speak to the answers for your problems that you've seen,
>> but in general I'd expect Liberty and Mitaka on RabbitMQ to handle your
>> cluster size without breaking a sweat. Have you reported the errors as
>> bugs in oslo.messaging? That might be where to start:
>>
>> https://bugs.launchpad.net/oslo.messaging/+filebug
>>
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>> OpenStack-operators at lists.openstack.org
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>
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