arrow not showing in rviz

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I was trying to display an arrow inside rviz by using below code:

#include <ros/ros.h>
#include <visualization_msgs/Marker.h>
#include <cmath>

int main( int argc, char** argv )
{
  ros::init(argc, argv, "lines");
  ros::NodeHandle n;
  ros::Rate r(1);
  ros::Publisher marker_pub = n.advertise<visualization_msgs::Marker>("lines", 10);

  while (ros::ok())
  {
      visualization_msgs::Marker arrow;
      arrow.header.frame_id = "/camera_depth_frame";
      arrow.header.stamp = ros::Time::now();

  arrow.ns = "lines";
  arrow.id = 1;

  arrow.type = visualization_msgs::Marker::ARROW;
  arrow.action = visualization_msgs::Marker::ADD;

  arrow.pose.position.x = 1;
  arrow.pose.position.y = 1;
  arrow.pose.position.z = 1;

  arrow.pose.orientation.x = 0.0;
  arrow.pose.orientation.y = 0.0;
  arrow.pose.orientation.z = 0.0;
  arrow.pose.orientation.w = 1.0;

  arrow.scale.x=1.0;
  arrow.scale.y=1.0;
  arrow.scale.z = 1.0;

  arrow.color.g = 1.0f;
  arrow.color.a = 1.0;
  arrow.color.r = 0.0f;
  arrow.color.b = 0.0f;

  arrow.lifetime = ros::Duration();

  while (marker_pub.getNumSubscribers() < 1)
     {
       if (!ros::ok())
       {
         return 0;
       }
       ROS_WARN_ONCE("Please create a subscriber to the marker");
       sleep(1);
     }

  marker_pub.publish(arrow);
  r.sleep();

} } but when i run rviz, what i'm seeing is a cylinder with a circle at the bottom. i'm not getting arrow marker. As i saw in tutorial code display shpae in this page also same shape comes in the name of arrow but what i want was an arrow line,vector with fixed position and direction no some shpae,my CmakeLists.txt is:

cmake_minimum_required(VERSION 2.8.3)
project(using_markers)

find_package(catkin REQUIRED COMPONENTS roscpp visualization_msgs)

catkin_package()

include_directories(${catkin_INCLUDE_DIRS})

add_executable(basic_shapes src/basic_shapes.cpp)
target_link_libraries(basic_shapes ${catkin_LIBRARIES})

add_executable(points_and_lines src/points_and_lines.cpp)
target_link_libraries(points_and_lines ${catkin_LIBRARIES})

add_executable(lines src/lines.cpp)
target_link_libraries(lines ${catkin_LIBRARIES})

Im using ros indigo. shouldn't i get a vector or line segment when i use arrow marker, i dont understand it.