@Override
  public boolean isRPCRunning() {
    return getState() == State.RUNNING;
  }
Indicates to the client whether this task is monitoring a currently active RPC call.
@return true if the monitored handler is currently servicing an RPC call.
hbase-server/src/main/java/org/apache/hadoop/hbase/monitoring/MonitoredRPCHandlerImpl.java