[openstack-dev] Do we need lock fencing?

Joshua Harlow harlowja at fastmail.com
Tue Feb 23 02:28:55 UTC 2016

Agreed seems pretty useful.

Unsure exactly how it would be performed in some of the tooz backends, 
but that's just a technical detail ;)

On 02/22/2016 03:41 PM, Chris Friesen wrote:
> It may also be beneficial to take a page from POSIX "robust mutexes" and
> introduce a way for the new lock holder to be notified that the previous
> lock holder's lease expired rather than the lock being unlocked cleanly.
> This alerts the new lock holder that the data protected by the lock may
> be self-inconsistent since the old lock holder may have died while in
> the middle of modifying things.
> Chris

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