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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.


Hi Erlon and Michal,
        Sorry for response you so late.
 
        The Cinder ServiceGroup is used for getting the state of services 
quickly.
        use case such as:
           1) As an admin, I want to know each cinder service state, so 
that I can take some
           actions to keep cloud in high availability if any service is 
down.
           2) As an user, I want my volumes not to be scheduled to failed 
cinder-volume
           instances.
        My colleague and I, have posted the specs[1] of ServiceGroup in 
Cinder.

Janice

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




发件人:         Erlon Cruz <sombrafam at gmail.com>
收件人:         "OpenStack Development Mailing List (not for usage 
questions)" <openstack-dev at lists.openstack.org>, 
日期:   2015/12/23 04:04
主题:   Re: [openstack-dev] [cinder] [nova] whether the ServiceGroup in 
Cinder is necessary



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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