This negative test expect HadoopIllegalArgumentException on illegal configuration. It uses JUnit (expected=HadoopIllegalArgumentException.class) and passed fine on Linux.
On windows, this test passes as well. But it left open handles on NN metadata directories used by MiniDFSCluster. As a result, quite a few of subsequent TestBalancer unit tests can't start MiniDFSCluster. The open handles prevents them from cleaning up NN metadata directories on Windows.
This JIRA is opened to explicitly catch the Exception and ensure the test cluster is properly shutdown.