private void printUsage(Options opts) {
    new HelpFormatter().printHelp("hbase hbtop [opts] [-D<property=value>]*", opts);
    System.out.println("");
    System.out.println(" Note: -D properties will be applied to the conf used.");
    System.out.println("  For example:");
    System.out.println("   -Dhbase.client.zookeeper.quorum=<zookeeper quorum>");
    System.out.println("   -Dzookeeper.znode.parent=<znode parent>");
    System.out.println("");
  }
A real-time monitoring tool for HBase like Unix top command.
hbase-hbtop/src/main/java/org/apache/hadoop/hbase/hbtop/HBTop.java