We are running openstack tempest API test suite and after we ran api/test_networks.py test we the the following exception. On the OVS there were many flows which were not deleted after the test completed. No test failures were reported. I have pulled the latet OVSDB and neutron code and build locally. We have identified two issue (I have the fix for those include when running the test) and the fix is submited for review.

https://git.opendaylight.org/gerrit/#/c/27619/
https://git.opendaylight.org/gerrit/27624

If anyone want to recreate this isue the above changes are needed. I will contintue to observe this issue and update if I learn anything new.

java.lang.NullPointerException
at org.opendaylight.openflowplugin.applications.statistics.manager.impl.StatListenCommitQueue$1.applyOperation(StatListenCommitQueue.java:129)[242:org.opendaylight.openflowplugin.applications.statistics-manager:0.2.0.SNAPSHOT]
at org.opendaylight.openflowplugin.applications.statistics.manager.impl.StatisticsManagerImpl.run(StatisticsManagerImpl.java:186)[242:org.opendaylight.openflowplugin.applications.statistics-manager:0.2.0.SNAPSHOT]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)[:1.7.0_79]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)[:1.7.0_79]