protected boolean drainSubscription(String topicName, String subName, String clientID)
protected void drainSubscription(String topicName, String subName, String clientID) throws PerfException
   protected boolean drainSubscription(String topicName, String subName, String clientID)   {      DrainJob drainJob = createDefaultDrainJob(topicName);      drainJob.setClientID(clientID);      drainJob.setSubName(subName);            JobResult res = runJob(drainJob);      if (res.failed)      {         log.error("Failed to drain subscription", res.throwables[0]);         return false;      }      return true;   }