# Pastebin 6GtHZQCt
.Exception in thread cassandra_driver_event_loop:
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 551, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.7/threading.py", line 504, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/usr/local/lib/python2.7/dist-packages/cassandra/io/asyncorereactor.py", line 100, in _run_loop
    if len(self._conns) == 0:
  File "/usr/lib/python2.7/_weakrefset.py", line 66, in __len__
    return sum(x() is not None for x in self.data)
  File "/usr/lib/python2.7/_weakrefset.py", line 66, in <genexpr>
    return sum(x() is not None for x in self.data)
RuntimeError: Set changed size during iteration

E
======================================================================
ERROR: test_closing_connections (thrift_hsha_test.ThriftHSHATest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/ariel_weisberg/cassandra-dtest/thrift_hsha_test.py", line 39, in test_closing_connections
    cursor = self.patient_cql_connection(node1)
  File "/home/ariel_weisberg/cassandra-dtest/dtest.py", line 322, in patient_cql_connection
    bypassed_exception=NoHostAvailable
  File "/home/ariel_weisberg/cassandra-dtest/dtest.py", line 77, in retry_till_success
    return fun(*args, **kwargs)
  File "/home/ariel_weisberg/cassandra-dtest/dtest.py", line 260, in cql_connection
    protocol_version)
  File "/home/ariel_weisberg/cassandra-dtest/dtest.py", line 289, in _create_session
    session = cluster.connect()
  File "/usr/local/lib/python2.7/dist-packages/cassandra/cluster.py", line 755, in connect
    self.control_connection.connect()
  File "/usr/local/lib/python2.7/dist-packages/cassandra/cluster.py", line 1868, in connect
    self._set_new_connection(self._reconnect_internal())
  File "/usr/local/lib/python2.7/dist-packages/cassandra/cluster.py", line 1903, in _reconnect_internal
    raise NoHostAvailable("Unable to connect to any servers", errors)
NoHostAvailable: ('Unable to connect to any servers', {'127.0.0.1': OperationTimedOut('errors=Timed out creating connection, last_host=None',)})
-------------------- >> begin captured logging << --------------------
dtest: DEBUG: cluster ccm directory: /tmp/dtest-1_RHak
--------------------- >> end captured logging << ---------------------

----------------------------------------------------------------------
Ran 2 tests in 62.568s

FAILED (errors=1)