title: How to avoid the automatic deleting of inactive topics in Apache Pulsar
body: <p>I have an application that produces messages to Pulsar under a specific topic and shut down the application when it's finished; at the same time, no consumer exists to read this topic. </p>
  
  <p>After a while, when I create a consumer and want to read the written data out, I found all data are lost since the topic I've written been deleted by Pulsar.</p>
  
  <p>How can I disable the auto-deletion of inactive topics in Pulsar?</p>