I updated to 2.8 but cilometer-dbsync fails:

]# ceilometer-dbsync --debug
2015-03-23 09:40:08.251 25985 DEBUG ceilometer.storage [-] looking for 'mongodb' driver in 'ceilometer.metering.storage' get_connection /usr/lib/python2.7/site-packages/ceilometer/storage/__init__.py:127
2015-03-23 09:40:08.340 25985 INFO ceilometer.storage.mongo.utils [-] Connecting to mongodb on [('127.0.0.1', 27017)]
2015-03-23 09:40:08.579 25985 DEBUG ceilometer.storage [-] looking for 'mongodb' driver in 'ceilometer.alarm.storage' get_connection /usr/lib/python2.7/site-packages/ceilometer/storage/__init__.py:127
2015-03-23 09:40:08.732 25985 INFO ceilometer.storage.mongo.utils [-] Connecting to mongodb on [('127.0.0.1', 27017)]
2015-03-23 09:40:08.842 25985 DEBUG ceilometer.storage [-] looking for 'mongodb' driver in 'ceilometer.event.storage' get_connection /usr/lib/python2.7/site-packages/ceilometer/storage/__init__.py:127
2015-03-23 09:40:08.844 25985 INFO ceilometer.storage.mongo.utils [-] Connecting to mongodb on [('127.0.0.1', 27017)]
2015-03-23 09:40:18.954 25985 DEBUG ceilometer.storage [-] looking for 'mongodb' driver in 'ceilometer.event.storage' get_connection /usr/lib/python2.7/site-packages/ceilometer/storage/__init__.py:127
2015-03-23 09:40:28.970 25985 DEBUG ceilometer.storage [-] looking for 'mongodb' driver in 'ceilometer.event.storage' get_connection /usr/lib/python2.7/site-packages/ceilometer/storage/__init__.py:127
2015-03-23 09:40:38.980 25985 DEBUG ceilometer.storage [-] looking for 'mongodb' driver in 'ceilometer.event.storage' get_connection /usr/lib/python2.7/site-packages/ceilometer/storage/__init__.py:127
2015-03-23 09:40:48.995 25985 DEBUG ceilometer.storage [-] looking for 'mongodb' driver in 'ceilometer.event.storage' get_connection /usr/lib/python2.7/site-packages/ceilometer/storage/__init__.py:127
2015-03-23 09:40:59.011 25985 DEBUG ceilometer.storage [-] looking for 'mongodb' driver in 'ceilometer.event.storage' get_connection /usr/lib/python2.7/site-packages/ceilometer/storage/__init__.py:127
2015-03-23 09:41:09.026 25985 DEBUG ceilometer.storage [-] looking for 'mongodb' driver in 'ceilometer.event.storage' get_connection /usr/lib/python2.7/site-packages/ceilometer/storage/__init__.py:127
2015-03-23 09:41:19.040 25985 DEBUG ceilometer.storage [-] looking for 'mongodb' driver in 'ceilometer.event.storage' get_connection /usr/lib/python2.7/site-packages/ceilometer/storage/__init__.py:127
2015-03-23 09:41:29.050 25985 DEBUG ceilometer.storage [-] looking for 'mongodb' driver in 'ceilometer.event.storage' get_connection /usr/lib/python2.7/site-packages/ceilometer/storage/__init__.py:127
2015-03-23 09:41:39.066 25985 DEBUG ceilometer.storage [-] looking for 'mongodb' driver in 'ceilometer.event.storage' get_connection /usr/lib/python2.7/site-packages/ceilometer/storage/__init__.py:127
2015-03-23 09:41:39.071 25985 CRITICAL ceilometer [-] OperationFailure: command SON([('listIndexes', u'event'), ('cursor', {})]) on namespace ceilometer.$cmd failed: no collection
2015-03-23 09:41:39.071 25985 TRACE ceilometer Traceback (most recent call last):
2015-03-23 09:41:39.071 25985 TRACE ceilometer   File "/usr/bin/ceilometer-dbsync", line 10, in <module>
2015-03-23 09:41:39.071 25985 TRACE ceilometer     sys.exit(dbsync())
2015-03-23 09:41:39.071 25985 TRACE ceilometer   File "/usr/lib/python2.7/site-packages/ceilometer/cmd/storage.py", line 32, in dbsync
2015-03-23 09:41:39.071 25985 TRACE ceilometer     storage.get_connection_from_config(cfg.CONF, 'event').upgrade()
2015-03-23 09:41:39.071 25985 TRACE ceilometer   File "/usr/lib/python2.7/site-packages/ceilometer/storage/__init__.py", line 117, in get_connection_from_config
2015-03-23 09:41:39.071 25985 TRACE ceilometer     return _inner()
2015-03-23 09:41:39.071 25985 TRACE ceilometer   File "/usr/lib/python2.7/site-packages/retrying.py", line 49, in wrapped_f
2015-03-23 09:41:39.071 25985 TRACE ceilometer     return Retrying(*dargs, **dkw).call(f, *args, **kw)
2015-03-23 09:41:39.071 25985 TRACE ceilometer   File "/usr/lib/python2.7/site-packages/retrying.py", line 212, in call
2015-03-23 09:41:39.071 25985 TRACE ceilometer     raise attempt.get()
2015-03-23 09:41:39.071 25985 TRACE ceilometer   File "/usr/lib/python2.7/site-packages/retrying.py", line 247, in get
2015-03-23 09:41:39.071 25985 TRACE ceilometer     six.reraise(self.value[0], self.value[1], self.value[2])
2015-03-23 09:41:39.071 25985 TRACE ceilometer   File "/usr/lib/python2.7/site-packages/retrying.py", line 200, in call
2015-03-23 09:41:39.071 25985 TRACE ceilometer     attempt = Attempt(fn(*args, **kwargs), attempt_number, False)
2015-03-23 09:41:39.071 25985 TRACE ceilometer   File "/usr/lib/python2.7/site-packages/ceilometer/storage/__init__.py", line 115, in _inner
2015-03-23 09:41:39.071 25985 TRACE ceilometer     return get_connection(url, namespace)
2015-03-23 09:41:39.071 25985 TRACE ceilometer   File "/usr/lib/python2.7/site-packages/ceilometer/storage/__init__.py", line 129, in get_connection
2015-03-23 09:41:39.071 25985 TRACE ceilometer     return mgr.driver(url)
2015-03-23 09:41:39.071 25985 TRACE ceilometer   File "/usr/lib/python2.7/site-packages/ceilometer/event/storage/impl_mongodb.py", line 53, in __init__
2015-03-23 09:41:39.071 25985 TRACE ceilometer     self.upgrade()
2015-03-23 09:41:39.071 25985 TRACE ceilometer   File "/usr/lib/python2.7/site-packages/ceilometer/event/storage/impl_mongodb.py", line 59, in upgrade
2015-03-23 09:41:39.071 25985 TRACE ceilometer     self.db.event)
2015-03-23 09:41:39.071 25985 TRACE ceilometer   File "/usr/lib/python2.7/site-packages/ceilometer/storage/impl_mongodb.py", line 421, in update_ttl
2015-03-23 09:41:39.071 25985 TRACE ceilometer     indexes = coll.index_information()
2015-03-23 09:41:39.071 25985 TRACE ceilometer   File "/usr/lib/python2.7/site-packages/ceilometer/storage/mongo/utils.py", line 399, in closure
2015-03-23 09:41:39.071 25985 TRACE ceilometer     return call(*args, **kwargs)
2015-03-23 09:41:39.071 25985 TRACE ceilometer   File "/usr/lib/python2.7/site-packages/ceilometer/storage/mongo/utils.py", line 421, in __call__
2015-03-23 09:41:39.071 25985 TRACE ceilometer     return self.method(*args, **kwargs)
2015-03-23 09:41:39.071 25985 TRACE ceilometer   File "/usr/lib64/python2.7/site-packages/pymongo/collection.py", line 1276, in index_information
2015-03-23 09:41:39.071 25985 TRACE ceilometer     cursor={}, read_preference=ReadPreference.PRIMARY)
2015-03-23 09:41:39.071 25985 TRACE ceilometer   File "/usr/lib64/python2.7/site-packages/pymongo/database.py", line 345, in _command
2015-03-23 09:41:39.071 25985 TRACE ceilometer     msg, allowable_errors)
2015-03-23 09:41:39.071 25985 TRACE ceilometer   File "/usr/lib64/python2.7/site-packages/pymongo/helpers.py", line 182, in _check_command_response
2015-03-23 09:41:39.071 25985 TRACE ceilometer     raise OperationFailure(msg % errmsg, code, response)
2015-03-23 09:41:39.071 25985 TRACE ceilometer OperationFailure: command SON([('listIndexes', u'event'), ('cursor', {})]) on namespace ceilometer.$cmd failed: no collection


and monog.log
2015-03-23T09:40:08.343+0100 I NETWORK  [initandlisten] connection accepted from 127.0.0.1:34072 #2 (1 connection now open)
2015-03-23T09:40:08.448+0100 I ACCESS   [conn2] Successfully authenticated as principal ceilometer on ceilometer
2015-03-23T09:40:08.451+0100 I INDEX    [conn2] allocating new ns file /var/lib/mongo/ceilometer.ns, filling with zeroes...
2015-03-23T09:40:08.551+0100 I STORAGE  [FileAllocator] allocating new datafile /var/lib/mongo/ceilometer.0, filling with zeroes...
2015-03-23T09:40:08.552+0100 I STORAGE  [FileAllocator] done allocating datafile /var/lib/mongo/ceilometer.0, size: 64MB,  took 0 secs
2015-03-23T09:40:08.560+0100 I INDEX    [conn2] build index on: ceilometer.resource properties: { v: 1, key: { user_id: 1, source: 1 }, name: "resource_idx", ns: "ceilometer.resource", background: false }
2015-03-23T09:40:08.560+0100 I INDEX    [conn2]          building index using bulk method
2015-03-23T09:40:08.561+0100 I INDEX    [conn2] build index done.  scanned 0 total records. 0 secs
2015-03-23T09:40:08.561+0100 I COMMAND  [conn2] command ceilometer.$cmd command: createIndexes { createIndexes: "resource", indexes: [ { background: false, name: "resource_idx", key: { user_id: 1, source: 1 } } ] } keyUpdates:0 writeConflicts:0 numYields:0 reslen:113 locks:{} 109ms
2015-03-23T09:40:08.563+0100 I INDEX    [conn2] build index on: ceilometer.meter properties: { v: 1, key: { resource_id: 1, user_id: 1, counter_name: 1, timestamp: 1, source: 1 }, name: "meter_idx", ns: "ceilometer.meter", background: false }
2015-03-23T09:40:08.563+0100 I INDEX    [conn2]          building index using bulk method
2015-03-23T09:40:08.563+0100 I INDEX    [conn2] build index done.  scanned 0 total records. 0 secs
2015-03-23T09:40:08.565+0100 I INDEX    [conn2] build index on: ceilometer.resource properties: { v: 1, key: { project_id: 1, source: 1 }, name: "resource_project_idx", ns: "ceilometer.resource", background: true }
2015-03-23T09:40:08.565+0100 I INDEX    [conn2] build index done.  scanned 0 total records. 0 secs
2015-03-23T09:40:08.567+0100 I INDEX    [conn2] build index on: ceilometer.meter properties: { v: 1, key: { resource_id: 1, project_id: 1, counter_name: 1, timestamp: 1, source: 1 }, name: "meter_project_idx", ns: "ceilometer.meter", background: true }
2015-03-23T09:40:08.567+0100 I INDEX    [conn2] build index done.  scanned 0 total records. 0 secs
2015-03-23T09:40:08.568+0100 I INDEX    [conn2] build index on: ceilometer.resource properties: { v: 1, key: { last_sample_timestamp: -1 }, name: "last_sample_timestamp_idx", ns: "ceilometer.resource", sparse: true }
2015-03-23T09:40:08.568+0100 I INDEX    [conn2]          building index using bulk method
2015-03-23T09:40:08.568+0100 I INDEX    [conn2] build index done.  scanned 0 total records. 0 secs
2015-03-23T09:40:08.569+0100 I INDEX    [conn2] build index on: ceilometer.meter properties: { v: 1, key: { timestamp: -1 }, name: "timestamp_idx", ns: "ceilometer.meter" }
2015-03-23T09:40:08.569+0100 I INDEX    [conn2]          building index using bulk method
2015-03-23T09:40:08.569+0100 I INDEX    [conn2] build index done.  scanned 0 total records. 0 secs
2015-03-23T09:40:08.570+0100 I COMMAND  [conn2] CMD: drop ceilometer.user
2015-03-23T09:40:08.571+0100 I COMMAND  [conn2] CMD: drop ceilometer.project
2015-03-23T09:40:08.575+0100 I COMMAND  [conn2] CMD: drop ceilometer.user
2015-03-23T09:40:08.575+0100 I COMMAND  [conn2] CMD: drop ceilometer.project
2015-03-23T09:40:08.578+0100 I NETWORK  [conn2] end connection 127.0.0.1:34072 (0 connections now open)
2015-03-23T09:40:08.733+0100 I NETWORK  [initandlisten] connection accepted from 127.0.0.1:34080 #3 (1 connection now open)
2015-03-23T09:40:08.839+0100 I ACCESS   [conn3] Successfully authenticated as principal ceilometer on ceilometer
2015-03-23T09:40:08.841+0100 I NETWORK  [conn3] end connection 127.0.0.1:34080 (0 connections now open)
2015-03-23T09:40:08.845+0100 I NETWORK  [initandlisten] connection accepted from 127.0.0.1:34081 #4 (1 connection now open)
2015-03-23T09:40:08.950+0100 I ACCESS   [conn4] Successfully authenticated as principal ceilometer on ceilometer
2015-03-23T09:41:39.111+0100 I NETWORK  [conn4] end connection 127.0.0.1:34081 (0 connections now open)


Of course user ceilometer was created earlier using (as it is at http://docs.openstack.org/icehouse/install-guide/install/apt/content/ceilometer-install.html):
> db = db.getSiblingDB("ceilometer");
> db.createUser({user: "ceilometer", pwd: "ceilometer", roles: [ "readWrite", "dbAdmin" ]})