[openstack-dev] [Fuel][FFE] Disabling HA for RPC queues in RabbitMQ

Peter Lemenkov lemenkov at gmail.com
Tue Dec 1 22:34:39 UTC 2015


Hello All!

Well, side-effects (or any other effects) are quite obvious and
predictable - this will decrease availability of RPC queues a bit.
That's for sure.

However, Dmitry's guess is that the overall messaging backplane
stability increase (RabitMQ won't fail too often in some cases) would
compensate for this change. This issue is very much real - speaking of
me I've seen an awful cluster's performance degradation when a failing
RabbitMQ node was killed by some watchdog application (or even worse
wasn't killed at all). One of these issues was quite recently, and I'd
love to see them less frequently.

That said I'm uncertain about the stability impact of this change, yet
I see a reasoning worth discussing behind it.

2015-12-01 20:53 GMT+01:00 Sergii Golovatiuk <sgolovatiuk at mirantis.com>:
> Hi,
>
> -1 for FFE for disabling HA for RPC queue as we do not know all side effects
> in HA scenarios.
>
> On Tue, Dec 1, 2015 at 7:34 PM, Dmitry Mescheryakov
> <dmescheryakov at mirantis.com> wrote:
>>
>> Folks,
>>
>> I would like to request feature freeze exception for disabling HA for RPC
>> queues in RabbitMQ [1].
>>
>> As I already wrote in another thread [2], I've conducted tests which
>> clearly show benefit we will get from that change. The change itself is a
>> very small patch [3]. The only thing which I want to do before proposing to
>> merge this change is to conduct destructive tests against it in order to
>> make sure that we do not have a regression here. That should take just
>> several days, so if there will be no other objections, we will be able to
>> merge the change in a week or two timeframe.
>>
>> Thanks,
>>
>> Dmitry
>>
>> [1] https://review.openstack.org/247517
>> [2]
>> http://lists.openstack.org/pipermail/openstack-dev/2015-December/081006.html
>> [3] https://review.openstack.org/249180
>>
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-- 
With best regards, Peter Lemenkov.



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