Hi Gupta, I am running a simple python application that isn’t heavy from point of view of access to cassandra. The application create a new keyspace, tables and do the load of data. The application is an example in python-driver folder.
> On 29 Oct 2015, at 00:33, Surbhi Gupta <surbhi.gupt...@gmail.com> wrote: > > 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 <eduardocalf...@gmail.com > <mailto:eduardocalf...@gmail.com>> 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 <http://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 >
