How do I delete/clean Kafka queued messages without deleting Topic

In 0.11 or higher you can run the bin/kafka-delete-records.sh command to mark messages for deletion.

For example, publish 100 messages

seq 100 | ./bin/kafka-console-producer.sh --broker-list localhost:9092 --topic mytest

then delete 90 of those 100 messages with the new kafka-delete-records.sh
command line tool

./bin/kafka-delete-records.sh --bootstrap-server localhost:9092 --offset-json-file ./offsetfile.json

where offsetfile.json contains

 {"partitions": [{"topic": "mytest", "partition": 0, "offset": 90}], "version":1 }

and then consume the messages from the beginning to verify that 90 of the 100 messages are indeed marked as deleted.

./bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic mytest --from-beginning
91
92
93
94
95
96
97
98
99
100