Kafka doesn't delete old messages in topics : <p>In kafka I have set retention policy to 3 days in <code>server.properties</code></p>

<pre><code>############################# Log Retention Policy #############################
...
log.retention.hours=72
...
</code></pre>

<p>Topics has <code>retention.ms</code> set to <code>172800000</code> (48h).</p>

<p>However, there are still old data in the folder /tmp/kafka-logs and none are being deleted. <em>I waited few hours after changing those properties.</em></p>

<p>Is there something that needs to be set? All topics are being produced to and consumed from currently.</p>
