Are you running heavy load? I have seen these kinds error application team reporting to us in case when they have too many connection already setup and they are trying to connect more applications.
Try to disconnect the applications which are not required and try again .. Hope this helps... On 28 October 2015 at 16:22, Eduardo Alfaia <[email protected]> wrote: > Hi Guys, > > I am some problems of Connection Timeout in a random mode, that is, the > application in python that I am using sometimes it does work very well > sometimes not, I am getting this error: > > 015-10-28 19:49:05,286 [WARNING] cassandra.cluster: [control connection] > Error connecting to 10.20.255.191: > Traceback (most recent call last): > File > "/home/ealfaia/workspace_patrizio/python-driver/cassandra/cluster.py", line > 2117, in _reconnect_internal > return self._try_connect(host) > File > "/home/ealfaia/workspace_patrizio/python-driver/cassandra/cluster.py", line > 2164, in _try_connect > self._refresh_schema(connection, preloaded_results=shared_results, > schema_agreement_wait=-1) > File > "/home/ealfaia/workspace_patrizio/python-driver/cassandra/cluster.py", line > 2343, in _refresh_schema > responses = connection.wait_for_responses(*queries, > timeout=self._timeout, fail_on_error=False) > File > "/home/ealfaia/workspace_patrizio/python-driver/cassandra/connection.py", > line 438, in wait_for_responses > return waiter.deliver(timeout) > File > "/home/ealfaia/workspace_patrizio/python-driver/cassandra/connection.py", > line 839, in deliver > raise OperationTimedOut() > OperationTimedOut: errors=None, last_host=None > 2015-10-28 19:49:05,292 [ERROR] cassandra.cluster: Control connection > failed to connect, shutting down Cluster: > Traceback (most recent call last): > File > "/home/ealfaia/workspace_patrizio/python-driver/cassandra/cluster.py", line > 840, in connect > self.control_connection.connect() > File > "/home/ealfaia/workspace_patrizio/python-driver/cassandra/cluster.py", line > 2091, in connect > self._set_new_connection(self._reconnect_internal()) > File > "/home/ealfaia/workspace_patrizio/python-driver/cassandra/cluster.py", line > 2126, in _reconnect_internal > raise NoHostAvailable("Unable to connect to any servers", errors) > NoHostAvailable: ('Unable to connect to any servers', {'10.20.255.191': > OperationTimedOut('errors=None, last_host=None',)}) > > I have had some tests with others applications in python and the same > error occur. Does anyone have any idea? > > Thanks a lot
