Open Stack

On Tue, Aug 04, 2015 at 09:52:40AM +0100, Lucas Alvares Gomes wrote:
> Hi,
> 
> > Our initial solution [1] was to simply disable instance queries in the
> > IronicHostManager, as they were never needed, and were painful to
> > execute. But subsequent discussion on IRC brought up some potential
> > (although not very likely) use cases where this might not be true. One
> > example was if there were two computes each talking to one of two
> > ironic installations, one might use the SameHostFilter to ensure that
> > a new ironic instance was placed in the same ironic environment as
> > another instance. While this seemed possible, the idea of querying
> > hundreds or thousands of instances to see if the target was in that
> > group seemed like overkill. I suggested that if this were ever
> > something that someone needed, creating a new filter would be a better
> > way forward than trying to retrofit the virt design onto ironic.
> >
> 
> Right, so my first suggestion would be to add a configuration option
> where one could toggle to enable or disable the new scheduler filters
> (defaulting to disabled). But if Nova doesn't want to add a new
> configuration option unless it's absolutely necessary I think we could
> just disable it for now (just like the patch is proposing right now)
> and open a bug about it so we can keep track of the problem. And if we
> figure out that this problem is affecting someone out there we can
> then fix it by whether adding the configuration option or creating a
> new filter or ... We can talk about the proper fix as part of that
> bug.

I'm also fine with this for now. The multiple-host work might help here,
too.

// jim

> 
> Cheers,
> Lucas
> 
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