[Openstack] [Tooz] Help in understanding DLM

Gary Kotton gkotton at vmware.com
Fri Aug 12 13:18:45 UTC 2016

In the vmware_nsx code base we make use of tooz extensively and the results have been very good. Just depends on what type of backend you use ☺
We wrote a wrapper that enables the deployer to decide on what type of locking to use. This can be seen at: https://github.com/openstack/vmware-nsx/blob/master/vmware_nsx/common/locking.py#L27
Each project can decide on where to use DLM. It depends on each community.

From: ESWAR RAO <eswar7028 at gmail.com>
Date: Friday, August 12, 2016 at 12:44 PM
To: "openstack at lists.openstack.org" <openstack at lists.openstack.org>
Subject: [Openstack] [Tooz] Help in understanding DLM

Hi All,

Please let me know if any examples are there with Tooz library for distributed locking.

Just wanted to know even though we have database locks to prevent concurrent updates and if applications are written well enough to handle STALE updates, does DLM is needed for openstack services like Heat or nova ??

Eswar Rao
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