When the race condition in PeriodicExecutor is hit, test_replica_set_reconfig.TestSecondaryAdded.test_client may fail with this error:
======================================== FAIL: test_client (test_replica_set_reconfig.TestSecondaryAdded) ---------------------------------------------------------------------- Traceback (most recent call last): File "/mnt/jenkins/workspace/mongo-python-driver/extensions/with-extensions/label/linux64/mongodb_configuration/single_server/mongodb_option/noauth/mongodb_server/30-release/python_language_version/2.6/test/test_replica_set_reconfig.py", line 160, in test_client 'reconnect to both secondaries') File "/mnt/jenkins/workspace/mongo-python-driver/extensions/with-extensions/label/linux64/mongodb_configuration/single_server/mongodb_option/noauth/mongodb_server/30-release/python_language_version/2.6/test/utils.py", line 305, in wait_until raise AssertionError("Didn't ever %s" % success_description) AssertionError: Didn't ever reconnect to both secondaries