@Override
 protected void tearDown() throws Exception {
   if (fs != null) {
     fs.delete(path("/tests3a"), true);
   }
   super.tearDown();
 }
 @Override
 protected void tearDown() throws Exception {
   super.tearDown();
   if (cluster != null) {
     cluster.shutdown();
     cluster = null;
   }
 }
 @Override
 protected void tearDown() throws Exception {
   super.tearDown();
   cluster.shutdown();
 }