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not to prolong single mode, I'd like to see it die. However we will
need to be able to add, change, remove, or noop portions of the tasks
graph in the future. Many of the plugins that cant currently be built
would rely on being able to sub out parts of the graph. How is that
going to factor into granular deployments?

On Tue, Jan 27, 2015 at 5:05 AM, Aleksandr Didenko
<adidenko at mirantis.com> wrote:
> Hi,
>
> After starting implementing granular deployment we've faced a bunch of
> issues that would make further development of this feature much more
> complicated if we have to support both Simple and HA deployment modes. For
> example: simple mode does not require cluster (corosync, pacemaker, vips,
> etc), so we had to skip this task for Simple mode somehow - we can use
> conditional tasks, or conditional manifests in our tasks, or create separate
> task graphs for different deployment modes, etc - either way it's pretty
> much doubling the amount of work for some parts of Fuel and our development
> cycle.
>
> At the moment, CI blocks us from further development of fuel-library
> modularization BP [2] because we still use Simple mode in CI. So in order to
> proceed with this BP we have two options:
>
> 1) remove Simple mode from CI/QA and thus drop it completely from Fuel
> 2) double our efforts to support both Simple and HA modes in granular
> deployment
>
> We have a BP about single-controller HA [1]. HA with single controller works
> just fine at the moment. So if you want to test Fuel on a minimum set of
> nodes, you can do this on 3 nodes (Fuel master, controller, compute), just
> like with Simple mode before. I suppose, it's time to finally drop support
> for Simple mode in Fuel :)
>
> [1] https://blueprints.launchpad.net/fuel/+spec/single-controller-ha
> [2] https://blueprints.launchpad.net/fuel/+spec/fuel-library-modularization
>
> --
> Regards,
> Aleksandr Didenko
>
>
> On Tue, Aug 26, 2014 at 9:25 AM, Mike Scherbakov <mscherbakov at mirantis.com>
> wrote:
>>
>> Definitely fuel spec is needed :)
>>
>>
>> On Mon, Aug 25, 2014 at 8:45 PM, Evgeniy L <eli at mirantis.com> wrote:
>>>
>>> Hi Andrew,
>>>
>>> I have some comments regarding to you action items
>>>
>>> >> 2) Removing simple mode from the ui and tests
>>> >> 3) Removing simple mode support from nailgun (maybe we leave it) and
>>> >> cli
>>>
>>> We shouldn't do it, because nailgun should handle both versions of
>>> cluster.
>>> What we have to do here is to use openstack.yaml to keep all possible
>>> modes.
>>> For new release there will be only ha, to manage previous releases we
>>> have
>>> to create data migrations in nailgun to create the filed with modes i.e.
>>> multinode
>>> and ha.
>>>
>>> Also fixes for ui are required too, I think it mostly related to wizard,
>>> 'mode' tab
>>> where use can chose ha or non ha cluster in case of new release there
>>> should
>>> be only ha, and in case of old releases there should be ha and multinode.
>>>
>>> Thanks,
>>>
>>>
>>>
>>> On Mon, Aug 25, 2014 at 8:19 PM, Andrew Woodward <xarses at gmail.com>
>>> wrote:
>>>>
>>>> Started a new thread so that we don't hijack the older thread.
>>>>  as
>>>>
>>>>>
>>>>> Andrew, will you work on it in 6.0? What are remaining items there?
>>>>> Also, it might affect our tests - simple mode runs faster so we use it for
>>>>> smoke ISO test. Anastasia, please confirm that we can switch smoke to
>>>>> one-ha-controller model, or even drop smoke at all and use BVT only (running
>>>>> CentOS 3 HA controllers and same with Ubuntu).
>>>>
>>>>
>>>> The primary reason that we haven't disabled single yet is was due to [0]
>>>> where we where having problems adding additional controllers. With the
>>>> changes to galera and rabbit clustering it appears that we ended up fixing
>>>> it already.
>>>>
>>>> The remaining issues are:
>>>> 1) Ensuring we have good test coverage for the cases we expect to
>>>> support [1]
>>>> 2) Removing simple mode from the ui and tests
>>>> 3) Removing simple mode support from nailgun (maybe we leave it) and cli
>>>> 4) Updating documentation
>>>>
>>>> [0] https://bugs.launchpad.net/fuel/+bug/1350266
>>>> [1] https://bugs.launchpad.net/fuel/+bug/1350266/comments/7
>>>>
>>>> --
>>>> Andrew
>>>> Mirantis
>>>> Ceph community
>>>>
>>>> _______________________________________________
>>>> OpenStack-dev mailing list
>>>> OpenStack-dev at lists.openstack.org
>>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
>>>>
>>>
>>>
>>> _______________________________________________
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>>> OpenStack-dev at lists.openstack.org
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>>>
>>
>>
>>
>> --
>> Mike Scherbakov
>> #mihgen
>>
>>
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>> OpenStack-dev at lists.openstack.org
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>>
>
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-- 
Andrew
Mirantis
Fuel community ambassador
Ceph community