code: public static void main(String argv[]) throws Exception {
      StringUtils.startupShutdownMessage(CoronaTaskTracker.class, argv, LOG);
      if (argv.length != 0) {
        System.out.println("usage: CoronaTaskTracker");
        System.exit(-1);
      }
      JobConf conf=new JobConf();
      // enable the server to track time spent waiting on locks
      ReflectionUtils.setContentionTracing
        (conf.getBoolean("tasktracker.contention.tracking", false));
      try {
        new CoronaTaskTracker(conf).run();
      } catch (Throwable t) {
        LOG.fatal("Error running CoronaTaskTracker", t);
        System.exit(-2);
      }
    }
docs: Start the TaskTracker, point toward the indicated JobTracker