code: public void handleRetry(Throwable cause) {
      try {
        this.retryPolicy.retry(connectionState, retryHandler, connectionFailHandler);
      } catch (RetryPolicy.RetryCancelled retryCancelled) {
        this.getNettyPromise().setFailure(cause);
      }
    }
docs: Handles a retry
  
  @param cause of last connect fail