[openstack-dev] [nova] Distributed locking

Matthew Booth mbooth at redhat.com
Fri Jun 13 08:13:00 UTC 2014

On 13/06/14 05:27, Angus Lees wrote:
> On Thu, 12 Jun 2014 05:06:38 PM Julien Danjou wrote:
>> On Thu, Jun 12 2014, Matthew Booth wrote:
>>> This looks interesting. It doesn't have hooks for fencing, though.
>>> What's the status of tooz? Would you be interested in adding fencing
>>> hooks?
>> It's maintained and developer, we have plan to use it in Ceilometer and
>> others projects. Joshua also wants to use it for Taskflow.
>> We are blocked for now by https://review.openstack.org/#/c/93443/ and by
>> the lack of resource to complete that request obviously, so help
>> appreciated. :)
>> As for fencing hooks, it sounds like a good idea.
> As far as I understand these things, in distributed-locking-speak "fencing" 
> just means "breaking someone else's lock".

No. It means forcibly preventing a delinquent node from further use of
the shared resource. An example of a fencing solution is a remote power
switch. No trust is required.


Matthew Booth
Red Hat Engineering, Virtualisation Team

Phone: +442070094448 (UK)
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