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Is 'self.context' used to handle other requests as well? I would suggest
generating a new context (neutron.context.get_admin_context()) for each
fixed interval looping call to ensure you aren't sharing a DB session with
another thread.

On Mon, Jan 11, 2016 at 2:26 AM, Koteswar <koti.kelam at gmail.com> wrote:

> vendor specific mech driver code, where I am doing some read/write to sql.
>
> def _create_port(self, port): switchports = port['port']['switchports']
> LOG.debug(_LE("_create_port switch: %s"), port) network_id = port['port'][
> 'network_id'] subnets = db.get_subnets_by_network(self.context,
> network_id) if not subnets: LOG.error("Subnet not found for the network")
> self._raise_ml2_error(wexc.HTTPNotFound, 'create_port') for switchport in
> switchports: switch_mac_id = switchport['switch_id'] port_id = switchport[
> 'port_id'] bnp_switch = db.get_bnp_phys_switch_by_mac(self.context,
> switch_mac_id) # check for port and switch level existence if not
> bnp_switch: LOG.error(_LE("No physical switch found '%s' "),
> switch_mac_id) self._raise_ml2_error(wexc.HTTPNotFound, 'create_port')
> phys_port = db.get_bnp_phys_port(self.context, bnp_switch.id, port_id) if
> not phys_port: LOG.error(_LE("No physical port found for '%s' "),
> phys_port) self._raise_ml2_error(wexc.HTTPNotFound, 'create_port') if
> bnp_switch.status != constants.SWITCH_STATUS['enable']: LOG.error(_LE("Physical
> switch is not Enabled '%s' "), bnp_switch.status) self._raise_ml2_error(wexc.HTTPBadRequest,
> 'create_port')
>
> On Mon, Jan 11, 2016 at 2:47 PM, Anna Kamyshnikova <
> akamyshnikova at mirantis.com> wrote:
>
>> Hi!
>>
>> Can you point what mechanism driver is this or the piece of code that
>> give this error?
>>
>> On Mon, Jan 11, 2016 at 11:58 AM, Koteswar <koti.kelam at gmail.com> wrote:
>>
>>> Hi All,
>>>
>>>
>>>
>>> In my mechanism driver, I am reading/writing into sql db in a fixed
>>> interval looping call. Sometimes I get the following error when I stop and
>>> start neutron server
>>>
>>> InvalidRequestError: This session is in 'prepared' state; no further SQL
>>> can be emitted within this transaction.
>>>
>>>
>>>
>>> I am using context.session.query() for add, delete, update and get.
>>> Please help me if any one resolved an issue like this.
>>>
>>>
>>>
>>> Full trace is as follows:
>>>
>>> 2016-01-06 15:33:21.799 [01;31mERROR neutron.plugins.ml2.managers
>>> [[01;36mreq-d940a1b6-253a-43d2-b5ff-6c784c8a520f [00;36madmin
>>> 83b5358da62a407f88155f447966356f[01;31m] [01;35m[01;31mMechanism driver
>>> 'hp' failed in create_port_precommit[00m
>>>
>>> [01;31m2016-01-06 15:33:21.799 TRACE neutron.plugins.ml2.managers
>>> [01;35m[00mTraceback (most recent call last):
>>>
>>> [01;31m2016-01-06 15:33:21.799 TRACE neutron.plugins.ml2.managers
>>> [01;35m[00m  File "/opt/stack/neutron/neutron/plugins/ml2/managers.py",
>>> line 394, in _call_on_drivers
>>>
>>> [01;31m2016-01-06 15:33:21.799 TRACE neutron.plugins.ml2.managers
>>> [01;35m[00m    getattr(driver.obj, method_name)(context)
>>>
>>> [01;31m2016-01-06 15:33:21.799 TRACE neutron.plugins.ml2.managers
>>> [01;35m[00m  File
>>> "/usr/local/lib/python2.7/dist-packages/baremetal_network_provisioning/ml2/mechanism_hp.py",
>>> line 67, in create_port_precommit
>>>
>>> [01;31m2016-01-06 15:33:21.799 TRACE neutron.plugins.ml2.managers
>>> [01;35m[00m    raise e
>>>
>>> [01;31m2016-01-06 15:33:21.799 TRACE neutron.plugins.ml2.managers
>>> [01;35m[00mInvalidRequestError: This session is in 'prepared' state; no
>>> further SQL can be emitted within this transaction.
>>>
>>> [01;31m2016-01-06 15:33:21.799 TRACE neutron.plugins.ml2.managers
>>> [01;35m[00m
>>>
>>> 2016-01-06 15:33:21.901 [01;31mERROR neutron.api.v2.resource
>>> [[01;36mreq-d940a1b6-253a-43d2-b5ff-6c784c8a520f [00;36madmin
>>> 83b5358da62a407f88155f447966356f[01;31m] [01;35m[01;31mcreate failed[00m
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00mTraceback (most recent call last):
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m  File "/opt/stack/neutron/neutron/api/v2/resource.py", line 83,
>>> in resource
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m    result = method(request=request, **args)
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m  File "/usr/local/lib/python2.7/dist-packages/oslo_db/api.py",
>>> line 146, in wrapper
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m    ectxt.value = e.inner_exc
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m  File
>>> "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 195,
>>> in __exit__
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m    six.reraise(self.type_, self.value, self.tb)
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m  File "/usr/local/lib/python2.7/dist-packages/oslo_db/api.py",
>>> line 136, in wrapper
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m    return f(*args, **kwargs)
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m  File "/opt/stack/neutron/neutron/api/v2/base.py", line 516, in
>>> create
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m    obj = do_create(body)
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m  File "/opt/stack/neutron/neutron/api/v2/base.py", line 498, in
>>> do_create
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m    request.context, reservation.reservation_id)
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m  File
>>> "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 195,
>>> in __exit__
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m    six.reraise(self.type_, self.value, self.tb)
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m  File "/opt/stack/neutron/neutron/api/v2/base.py", line 491, in
>>> do_create
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m    return obj_creator(request.context, **kwargs)
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m  File "/usr/local/lib/python2.7/dist-packages/oslo_db/api.py",
>>> line 146, in wrapper
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m    ectxt.value = e.inner_exc
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m  File
>>> "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 195,
>>> in __exit__
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m    six.reraise(self.type_, self.value, self.tb)
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m  File "/usr/local/lib/python2.7/dist-packages/oslo_db/api.py",
>>> line 136, in wrapper
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m    return f(*args, **kwargs)
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m  File "/opt/stack/neutron/neutron/plugins/ml2/plugin.py", line
>>> 1040, in create_port
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m    result, mech_context = self._create_port_db(context, port)
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m  File "/opt/stack/neutron/neutron/plugins/ml2/plugin.py", line
>>> 1032, in _create_port_db
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m    self.mechanism_manager.create_port_precommit(mech_context)
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m  File "/opt/stack/neutron/neutron/plugins/ml2/managers.py",
>>> line 590, in create_port_precommit
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m    self._call_on_drivers("create_port_precommit", context)
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m  File "/opt/stack/neutron/neutron/plugins/ml2/managers.py",
>>> line 405, in _call_on_drivers
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00m    method=method_name
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource
>>> [01;35m[00mMechanismDriverError: create_port_precommit failed.
>>>
>>> [01;31m2016-01-06 15:33:21.901 TRACE neutron.api.v2.resource [01;35m[00m
>>>
>>>
>>>
>>> Regards,
>>>
>>> Koteswar
>>>
>>>
>>> __________________________________________________________________________
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>>>
>>
>>
>> --
>> Regards,
>> Ann Kamyshnikova
>> Mirantis, Inc
>>
>> __________________________________________________________________________
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>>
>
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>


-- 
Kevin Benton
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