This test has failed a couple times for me with:
See https://builds.cask.co/browse/CDAP-DUT7257-3/test for an example.
This seems not coming from the test itself, but from the test base when deleting the deleting namespace when test finished. It might due to machine resource issue.
Reduce unit-test JVM memory https://github.com/cdapio/cdap/pull/12384
Remove the useless delete namespace call https://github.com/cdapio/cdap/pull/12387