@Override
    public void postCompletedDeleteTableAction(
      final ObserverContext<MasterCoprocessorEnvironment> ctx, final TableName tableName)
      throws IOException {
      // the AccessController test, some times calls only and directly the
      // postCompletedDeleteTableAction()
      if (tableDeletionLatch != null) {
        tableDeletionLatch.countDown();
      }
    }
Revoke global permissions from the given user using AccessControlClient. Will wait until all
active AccessController instances have updated their permissions caches or will throw an
exception upon timeout (10 seconds).
hbase-server/src/test/java/org/apache/hadoop/hbase/security/access/SecureTestUtil.java