Flaky dTest: repair_tests.repair_test.TestRepair.test_simple_sequential_repair

Failed 5 times in the last 30 runs. Flakiness: 24%, Stability: 83%

Error Message
cassandra.cluster.NoHostAvailable: ('Unable to complete the operation against any hosts', {<Host: 127.0.0.1 datacenter1>: ConnectionException('Host has been marked down or removed',), <Host: 127.0.0.3 datacenter1>: ConnectionException('Pool is shutdown',)})
Stacktrace
self = <repair_tests.repair_test.TestRepair object at 0x7fb3bbc72908>

    def test_simple_sequential_repair(self):
        """
            Calls simple repair test with a sequential repair
            """
>       self._simple_repair(sequential=True)

repair_tests/repair_test.py:350: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
repair_tests/repair_test.py:440: in _simple_repair
    self._populate_cluster()
repair_tests/repair_test.py:115: in _populate_cluster
    insert_c1c2(session, keys=list(range(1001, 2001)), consistency=ConsistencyLevel.ALL)
tools/data.py:29: in insert_c1c2
    execute_concurrent_with_args(session, statement, [['k{}'.format(k)] for k in keys])
../venv/src/cassandra-driver/cassandra/concurrent.py:239: in execute_concurrent_with_args
    return execute_concurrent(session, zip(cycle((statement,)), parameters), *args, **kwargs)
../venv/src/cassandra-driver/cassandra/concurrent.py:95: in execute_concurrent
    return executor.execute(concurrency, raise_on_first_error)
../venv/src/cassandra-driver/cassandra/concurrent.py:202: in execute
    return super(ConcurrentExecutorListResults, self).execute(concurrency, fail_fast)
../venv/src/cassandra-driver/cassandra/concurrent.py:121: in execute
    return self._results()
../venv/src/cassandra-driver/cassandra/concurrent.py:220: in _results
    self._raise(self._exception)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

exc = NoHostAvailable('Unable to complete the operation against any hosts', {<Host: 127.0.0.1 datacenter1>: ConnectionException('Host has been marked down or removed',), <Host: 127.0.0.3 datacenter1>: ConnectionException('Pool is shutdown',)})

    @staticmethod
    def _raise(exc):
        if six.PY2 and isinstance(exc, tuple):
            (exc_type, value, traceback) = exc
            six.reraise(exc_type, value, traceback)
        else:
>           raise exc
E           cassandra.cluster.NoHostAvailable: ('Unable to complete the operation against any hosts', {<Host: 127.0.0.1 datacenter1>: ConnectionException('Host has been marked down or removed',), <Host: 127.0.0.3 datacenter1>: ConnectionException('Pool is shutdown',)})

../venv/src/cassandra-driver/cassandra/concurrent.py:168: NoHostAvailable