@Override
    protected void initClusterSchemaService() throws IOException, InterruptedException {
      if (ARRIVE != null) {
        ARRIVE.countDown();
        CONTINUE.await();
      }
      super.initClusterSchemaService();
    }
Test to confirm that we will not hang when stop a backup master which is trying to become the
active master. See HBASE-19838
hbase-server/src/test/java/org/apache/hadoop/hbase/master/TestShutdownBackupMaster.java