Is there a way to delete all the data from a topic or delete the topic before every run?

Question

Is there a way to delete all the data from a topic or delete the topic before every run?

Can I modify the KafkaConfig.scala file to change the logRetentionHour

Answer 1

As a dirty workaround, you can adjust per-topic runtime retention settings, e.g. bin/kafka-topics.sh --zookeeper localhost:2181 --alter --topic my_topic --config retention.bytes=1 (retention.bytes=0 might also work)

After a short while kafka should free the space. Not sure if this has any implications compared to re-creating the topic.

ps. Better bring retention settings back, once kafka done with cleaning.

You can also use retention.ms to persist historical data