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i would probably ask this question on gnocchi[1] as i don't know how many devs read this. you should also add what numerical version of gnocchi you're using and what coordination service you're using.

if i were to quickly guess, i'm going to to assume you're not using a dedicated coordination service and are relying on the db based on your comment. if so, i would add the version of tooz you have as there are certain versions of tooz that do not handle locking with SQL well. (don't have the exact versions of tooz that are broken handy)

[1] https://github.com/gnocchixyz/gnocchi/issues
--
gord

________________________________________
From: Ignazio Cassano <ignaziocassano at gmail.com>
Sent: June 13, 2018 7:36 AM
To: OpenStack Operators
Subject: [Openstack-operators] openstack ocata gnocchi statsd errors

Hello everyone,
I installed centos 7 openstack ocata with gnocchi.
The gnocchi backand is "file" and /var/lib/gnocchi is on netapp nfs.
Sometime a lot of locks are created on nfs and the statsd.log reports
the following:

2018-03-05 08:56:34.743 58931 ERROR trollius [-] Exception in callback _flush() at /usr/lib/python2.7/site-packages/gnocchi/statsd.py:179
handle: <TimerHandle when=1180741.55618 _flush() at /usr/lib/python2.7/site-packages/gnocchi/statsd.py:179>
2018-03-05 08:56:34.743 58931 ERROR trollius Traceback (most recent call last):
2018-03-05 08:56:34.743 58931 ERROR trollius   File "/usr/lib/python2.7/site-packages/trollius/events.py", line 136, in _run
2018-03-05 08:56:34.743 58931 ERROR trollius     self._callback(*self._args)
2018-03-05 08:56:34.743 58931 ERROR trollius   File "/usr/lib/python2.7/site-packages/gnocchi/statsd.py", line 181, in _flush
2018-03-05 08:56:34.743 58931 ERROR trollius     stats.flush()
2018-03-05 08:56:34.743 58931 ERROR trollius   File "/usr/lib/python2.7/site-packages/gnocchi/statsd.py", line 93, in flush
2018-03-05 08:56:34.743 58931 ERROR trollius     with_metrics=True)
2018-03-05 08:56:34.743 58931 ERROR trollius   File "/usr/lib/python2.7/site-packages/oslo_db/api.py", line 151, in wrapper
2018-03-05 08:56:34.743 58931 ERROR trollius     ectxt.value = e.inner_exc
2018-03-05 08:56:34.743 58931 ERROR trollius   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2018-03-05 08:56:34.743 58931 ERROR trollius     self.force_reraise()
2018-03-05 08:56:34.743 58931 ERROR trollius   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
2018-03-05 08:56:34.743 58931 ERROR trollius     six.reraise(self.type_, self.value, self.tb)
2018-03-05 08:56:34.743 58931 ERROR trollius   File "/usr/lib/python2.7/site-packages/oslo_db/api.py", line 139, in wrapper
2018-03-05 08:56:34.743 58931 ERROR trollius     return f(*args, **kwargs)
2018-03-05 08:56:34.743 58931 ERROR trollius   File "/usr/lib/python2.7/site-packages/gnocchi/indexer/sqlalchemy.py", line 932, in get_resource
2018-03-05 08:56:34.743 58931 ERROR trollius     session, resource_type)['resource']
2018-03-05 08:56:34.743 58931 ERROR trollius   File "/usr/lib/python2.7/site-packages/gnocchi/indexer/sqlalchemy.py", line 574, in _resource_type_to_mappers


Anyone could help me, please?
What's happening ?

Regards
Ignazio