title: how to make sub-topics in Kafka
body: <p>I am trying to represent <strong>Topics</strong> and <strong>Sub-topics</strong> in <strong>Kafka</strong>.
  Example : Topic 'Sports' Sub-topic 'Football', 'Handball'</p>
  
  <p>And as I know Kafka doesn't support this. what I am using now are Topics like this <strong>'Sports_Football'</strong> , <strong>'Sports_Handball'</strong>...
  this is not really functional because when we need to when we want the Topic 'Sports' with all the subs we need to query all the topics for it.</p>
  
  <p>we are also using <strong>Redis</strong> and <strong>Apache Storm</strong>. So please is there a better way of doing this?</p>