How to delete kafka message

[#1]

Kafka has 10k messages left over due to Kafka consumer (topology) is down.

I dont want to process the left over messages when topology is up. How to remove those messages.

One more use case, I want to show demo to user, I want to quickly delete those messages from kafka.

how to delete kafka messages instantly.

[#2]

refer the thread https://community.hortonworks.com/questions/1786/how-to-clean-up-purge-kafka-queues.html