Open Stack

On 03/20/2014 11:35 AM, David Kranz wrote:
> On 03/20/2014 06:15 AM, Sean Dague wrote:
>> On 03/20/2014 05:49 AM, Nadya Privalova wrote:
>>> Hi all,
>>> First of all, thanks for your suggestions!
>>>
>>> To summarize the discussions here:
>>> 1. We are not going to install Mongo (because "is's wrong" ?)
>> We are not going to install Mongo "not from base distribution", because
>> we don't do that for things that aren't python. Our assumption is
>> dependent services come from the base OS.
>>
>> That being said, being an integrated project means you have to be able
>> to function, sanely, on an sqla backend, as that will always be part of
>> your gate.
> This is a claim I think needs a bit more scrutiny if by "sanely" you
> mean "performant". It seems we have an integrated project that no one
> would deploy using the sql db driver we have in the gate. Is any one
> doing that?  Is having a scalable sql back end a goal of ceilometer?
> 
> More generally, if there is functionality that is of great importance to
> any cloud deployment (and we would not integrate it if we didn't think
> it was) that cannot be deployed at scale using sqla, are we really going
> to say it should not be a part of OpenStack because we refuse, for
> whatever reason, to run it in our gate using a driver that would
> actually be used? And if we do demand an sqla backend, how much time
> should we spend trying to optimize it if no one will really use it?
> Though the slow heat job is a little different because the slowness
> comes directly from running real use cases, perhaps we should just set
> up a "slow ceilometer" job if the sql version is too slow for its budget
> in the main job.
> 
> It seems like there is a similar thread, at least in part, about this
> around marconi.

We required a non mongo backend to graduate ceilometer. So I don't think
it's too much to ask that it actually works.

If the answer is that it will never work and it was a checkbox with no
intent to make it work, then it should be deprecated and removed from
the tree in Juno, with a big WARNING that you shouldn't ever use that
backend. Like Nova now does with all the virt drivers that aren't tested
upstream.

Shipping in tree code that you don't want people to use is bad for
users. Either commit to making it work, or deprecate it and remove it.

I don't see this as the same issue as the slow heat job. Heat,
architecturally, is going to be slow. It spins up real OSes and does
real thinks to them. There is no way that's ever going to be fast, and
the dedicated job was a recognition that to support this level of
services in OpenStack we need to give them more breathing room.

Architecturally Ceilometer should not be this expensive. We've got some
data showing it to be aberrant from where we believe it should be. We
should fix that.

Once we get a base OS in the gate that lets us direct install mongo from
base packages, we can also do that. Or someone can 3rd party it today.
Then we'll even have comparative results to understand the differences.

	-Sean

-- 
Sean Dague
Samsung Research America
sean at dague.net / sean.dague at samsung.com
http://dague.net

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