Open Stack

Hi Folks,

Generally the scheduler's capabilities that are exposed via hints can be enabled or disabled in a Nova install by choosing the set of filters that are configured.     However the server group feature doesn't fit that pattern - even if the affinity filter isn't configured the anti-affinity check on the server will still impose the anti-affinity behavior via throwing the request back to the scheduler.

I appreciate that you can always disable the server-groups API extension, in which case users can't create a group (and so the server create will fail if one is specified), but that seems kind of at odds with other type of scheduling that has to be specifically configured in rather than out of a base system.    In particular having the API extension in by default but the ServerGroup Affinity and AntiAffinity  filters not in by default seems an odd combination (it kind of works, but only by a retry from the host and that's limited to a number of retries).

Given that the server group work isn't complete yet (for example the list of instances in a group isn't tided up when an instance is deleted) I feel a tad worried that the current default configuration exposed this rather than keeping it as something that has to be explicitly enabled - what do others think ?

Phil


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