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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
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