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Hmm, I see. There's this spec[1] that was discussed in the past with a
similar proposal. There's a SPEC with some other points on the discussion,
I think Janice forgot to mention.

Erlon

[1] https://review.openstack.org/#/c/176233/
[2] https://review.openstack.org/#/c/258968/

On Tue, Dec 22, 2015 at 12:16 PM, Michał Dulko <michal.dulko at intel.com>
wrote:

> On 12/22/2015 01:29 PM, Erlon Cruz wrote:
> > Hi Li,
> >
> > Can you give a quick background on servicegroups (or links to. The
> > spec you linked only describe the process on Nova to change from what
> > they are using to tooz)? Also, what are the use cases and benefits of
> > using this?
> >
> > Erlon
> >
>
> This is simply and idea to be able to use something more sophisticated
> than DB heartbeats to monitor services states. With Tooz implemented for
> that we would be able to use for example ZooKeeper to know about service
> failure in a matter of seconds instead of around a minute. This would
> shrink the window in which c-sch doesn't-know-yet that c-vol failed and
> sends RPC messages to a service that will never answer. I think there
> are more use cases related to service monitoring and failover.
>
> Service groups isn't probably a correct name for proposed enhancement -
> we have this concept somehow implemented, but proposed idea seems to be
> related to making it pluggable.
>
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