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Le 11/02/2015 17:04, Gary Kotton a écrit :
> I posted a fix that does not break things and supports HA.
> https://review.openstack.org/154029


Just let's be clear, HA is *not* supported by Nova now.

The main reason is that compute *nodes* are considered given by the 
hypervisor (ie. the virt driver ran by the compute manager worker), so 
if 2 or more hypervisors on two distinct machines are getting the same 
list of nodes, then you would have duplicates.

-Sylvain

> On 2/11/15, 5:55 PM, "Matthew Booth" <mbooth at redhat.com> wrote:
>
>> On 11/02/15 15:49, Gary Kotton wrote:
>>> Hi,
>>> I do not think that that is a healthy solution. That effectively would
>>> render a cluster down if the compute node goes down. That would be a
>>> real
>>> disaster. The ugly work around is setting the host names to be the same
>>> value.
>> I don't think that's an ugly work around. I think that's the only
>> currently viable solution.
>>
>>> This is something that we should discuss at the next summit and I would
>>> hope to propose a topic to talk about.
>> Sounds like a good plan. However, given that the bug is marked Critical
>> I was assuming we wanted a more expedient fix, which is what I've
>> proposed.
>>
>> Matt
>>
>>> Thanks
>>> Gary
>>>
>>> On 2/11/15, 5:31 PM, "Matthew Booth" <mbooth at redhat.com> wrote:
>>>
>>>> I just posted this:
>>>>
>>>> https://review.openstack.org/#/c/154907/
>>>>
>>>> as an alternative fix for critical bug:
>>>>
>>>> https://bugs.launchpad.net/nova/+bug/1419785
>>>>
>>>> I've just knocked this up quickly for illustration: it obviously needs
>>>> plenty of cleanup. I have confirmed that it works, though.
>>>>
>>>> Before I take it any further, though, I'd like to get some feedback on
>>>> the approach. I prefer this to the alternative, because the underlying
>>>> problem is deeper than supporting evacuate. I'd prefer to be honest
>>>> with
>>>> the user and just say it ain't gonna work. The alternative would leave
>>>> Nova running in a broken state, leaving inconsistent state in its wake
>>>> as it runs.
>>>>
>>>> Matt
>>>>
>>>> -- 
>>>> Matthew Booth
>>>> Red Hat Engineering, Virtualisation Team
>>>>
>>>> Phone: +442070094448 (UK)
>>>> GPG ID:  D33C3490
>>>> GPG FPR: 3733 612D 2D05 5458 8A8A 1600 3441 EA19 D33C 3490
>>>>
>>>>
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>>
>> -- 
>> Matthew Booth
>> Red Hat Engineering, Virtualisation Team
>>
>> Phone: +442070094448 (UK)
>> GPG ID:  D33C3490
>> GPG FPR: 3733 612D 2D05 5458 8A8A 1600 3441 EA19 D33C 3490
>>
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