@Override
  public void waitForJournalNodeToStop(ServerName serverName, long timeout) {
    LOG.warn("Waiting for journalnodes to stop on mini cluster is not supported");
  }
Alternate shutdown hook. Just shuts down the passed fs, not all as default filesystem hook
does.
hbase-server/src/test/java/org/apache/hadoop/hbase/SingleProcessHBaseCluster.java