title: kafka-python read from last produced message after a consumer restart
body: <p>i am using <a href="https://github.com/dpkp/kafka-python" rel="noreferrer">kafka-python</a> to consume messages from a kafka queue (kafka version 0.10.2.0). In particular i am using <a href="http://kafka-python.readthedocs.io/en/master/apidoc/KafkaConsumer.html" rel="noreferrer">KafkaConsumer</a> type.
  If the consumer stops and after a while it is restarted i would like to restart from the latest produced message, that is drop all the messages produced during the time the consumer was down.
  How can i achieve this?</p>
  
  <p>Thanks</p>