[openstack-dev] [cinder] [driver] DB operations
amit.das at cloudbyte.com
Sat Dec 20 02:37:13 UTC 2014
Do you mean hepler methods in the specific driver class?
On 19 Dec 2014 14:51, "Duncan Thomas" <duncan.thomas at gmail.com> wrote:
> So our general advice has historical been 'drivers should not be accessing
> the db directly'. I haven't had chance to look at your driver code yet,
> I've been on vacation, but my suggestion is that if you absolutely must
> store something in the admin metadata rather than somewhere that is covered
> by the model update (generally provider location and provider auth) then
> writing some helper methods that wrap the context bump and db call would be
> better than accessing it directly from the driver.
> Duncan Thomas
> On Dec 18, 2014 11:41 PM, "Amit Das" <amit.das at cloudbyte.com> wrote:
>> Hi Stackers,
>> I have been developing a Cinder driver for CloudByte storage and have
>> come across some scenarios where the driver needs to do create, read &
>> update operations on cinder database (volume_admin_metadata table). This is
>> required to establish a mapping between OpenStack IDs with the backend
>> storage IDs.
>> Now, I have got some review comments w.r.t the usage of DB related
>> operations esp. w.r.t raising the context to admin.
>> In short, it has been advised not to use "*context.get_admin_context()*".
>> However, i get errors trying to use the default context as shown below:
>> *2014-12-19 12:18:17.880 TRACE oslo.messaging.rpc.dispatcher File
>> "/opt/stack/cinder/cinder/db/sqlalchemy/api.py", line 103, in
>> *2014-12-19 12:18:17.880 TRACE oslo.messaging.rpc.dispatcher return
>> *2014-12-19 12:18:17.880 TRACE oslo.messaging.rpc.dispatcher
>> AttributeError: 'module' object has no attribute 'is_admin'*
>> So what is the proper way to run these DB operations from within a driver
>> *CloudByte Inc.* <http://www.cloudbyte.com/>
>> OpenStack-dev mailing list
>> OpenStack-dev at lists.openstack.org
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> OpenStack-dev at lists.openstack.org
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