openstack team mailing list archive

[Johannes Erdfelt <johannes@xxxxxxxxxxx>]

On Fri, Mar 23, 2012, Kevin L. Mitchell <kevin.mitchell@xxxxxxxxxxxxx> wrote:
> On Fri, 2012-03-23 at 13:43 +0000, Gabe Westmaas wrote:
> > However, I kind of expect that many users
> > will still poll even if they know they won't get new data until X
> > time. 
> 
> I wish there was some kind of way for us to issue push notifications to
> the client, i.e., have the client register some sort of callback and
> what piece of data / state change they're interested in, then nova would
> call that callback when the condition occurred.  It probably wouldn't
> stop polling, but we could ratchet down rate limits to encourage users
> to use the callback mechanism.
> 
> Of course, then there's the problem of, what if the user is behind a
> firewall or some sort of NAT... :/

Long polling is always an option.

JE