public TaskHeartbeatRunable(WorkerData workerData) {
this.zkCluster = workerData.getZkCluster();
this.topology_id = workerData.getTopologyId();
this.uptime = new UptimeComputer();;
this.storm_conf = workerData.getStormConf();
this.active = workerData.getActive();
String key = Config.TASK_HEARTBEAT_FREQUENCY_SECS;
Object time = storm_conf.get(key);