title: Kafka offset is set to -1000
body: <p>My Kafka Consumer says the following:</p>
  <pre><code>[TopicPartition{topic=my-topic,partition=0,offset=-1000,error=None}]
  </code></pre>
  <p>Whenever I run poll(), it returns <code>None</code>.</p>
  <p>I want the offset to be set to the last consumed message. If I manually set the <code>offset=0</code>, anytime I re-start the consumer, all messages will be re-read -- I only want to consume messages from the last offset.</p>
  <p>Why is my offset set to -1000?</p>
  <p>How can I have kafka manage the offset for me instead of it always being -1000?</p>
  <p>What does a -1000 offset mean, it seems pretty invalid.</p>