title: When/how does a topic "marked for deletion" get finally removed?
body: <p>I have issued the command to delete a topic:</p>
  
  <pre><code>./bin/kafka-topics.sh --zookeeper localhost:2181 --delete --topic  vip_ips_alerts
  </code></pre>
  
  <p>It seemed to give a happy response:</p>
  
  <pre><code>[2014-05-31 20:58:10,112] INFO zookeeper state changed (SyncConnected) (org.I0Itec.zkclient.ZkClient)
  Topic "vip_ips_alerts" queued for deletion.
  </code></pre>
  
  <p>But now 10 minutes later the topic still appears in the <code>--list</code> command:</p>
  
  <pre><code>./bin/kafka-topics.sh --zookeeper localhost:2181 --list
  vip_ips_alerts - marked for deletion
  </code></pre>
  
  <p>So what does that mean?  When will the topic be <em>really</em> deleted?  How do I expedite this process?</p>