occasion error reading unprocessed measure

i get this error maybe once every few thousands metrics. it is not consistent but not rare. just to describe my test pattern, i post 10 measures for ~20k metrics... and then 10 minute later, i post 10 new measures for same 20k metrics. between posts and processing, services do sit idle for a bit.

2016-06-22 21:06:34.828 18484 ERROR gnocchi.storage._carbonara [-] Error processing new measures
2016-06-22 21:06:34.828 18484 ERROR gnocchi.storage._carbonara Traceback (most recent call last):
2016-06-22 21:06:34.828 18484 ERROR gnocchi.storage._carbonara File "/root/dev/gnocchi/gnocchi/storage/_carbonara.py" line 354 in process_measures
2016-06-22 21:06:34.828 18484 ERROR gnocchi.storage._carbonara with self._process_measure_for_metric(metric) as measures:
2016-06-22 21:06:34.828 18484 ERROR gnocchi.storage._carbonara File "/usr/lib64/python2.7/contextlib.py" line 17 in __enter__
2016-06-22 21:06:34.828 18484 ERROR gnocchi.storage._carbonara return self.gen.next()
2016-06-22 21:06:34.828 18484 ERROR gnocchi.storage._carbonara File "/root/dev/gnocchi/gnocchi/storage/ceph.py" line 219 in _process_measure_for_metric
2016-06-22 21:06:34.828 18484 ERROR gnocchi.storage._carbonara data = self._get_object_content(ctx n)
2016-06-22 21:06:34.828 18484 ERROR gnocchi.storage._carbonara File "/root/dev/gnocchi/gnocchi/storage/ceph.py" line 333 in _get_object_content
2016-06-22 21:06:34.828 18484 ERROR gnocchi.storage._carbonara data = ioctx.read(name offset=offset)
2016-06-22 21:06:34.828 18484 ERROR gnocchi.storage._carbonara File "rados.pyx" line 425 in rados.requires.wrapper.validate_func (rados.c:4106)
2016-06-22 21:06:34.828 18484 ERROR gnocchi.storage._carbonara File "rados.pyx" line 2281 in rados.Ioctx.read (rados.c:25439)
2016-06-22 21:06:34.828 18484 ERROR gnocchi.storage._carbonara ObjectNotFound: Ioctx.read(gnocchi): failed to read measure_fd407743-db04-42d3-a129-9a3a5b36f7dd_fb931995-e01a-4943-9d72-a2f0d67783fc_20160623_01:00:22
2016-06-22 21:06:34.828 18484 ERROR gnocchi.storage._carbonara