ros rviz 接收visualization_msgs::Marker crash

rviz 作为接收侧，在接收visualization_msgs::Marker topic时，由于rviz内部Marker没有删除机制，所以内存增长导致Out of memory，具体log如下：

terminate called after throwing an instance of 'Ogre::InternalErrorException'
  what():  OGRE EXCEPTION(7:InternalErrorException): Index Buffer: Out of memory in GLHardwareIndexBuffer::lock at /build/ogre-1.9-B6QkmW/ogre-1.9-1.9.0+dfsg1/RenderSystems/GL/src/OgreGLHardwareIndexBuffer.cpp (line 122)

所以在发送侧需要定义delete action删除 rviz接收侧的Marker，具体如下：

markers.action = visualization_msgs::Marker::DELETE;