protected void killJournalNode(ServerName server) throws IOException {
    getLogger().info("Killing journalnode {}", server.getHostname());
    cluster.killJournalNode(server);
    cluster.waitForJournalNodeToStop(server, killNameNodeTimeout);
    getLogger().info("Killed journalnode {}", server);
  }
Returns current region servers - active master
hbase-it/src/test/java/org/apache/hadoop/hbase/chaos/actions/Action.java