How to flush the __consumer_offsets topic?

Question

How can I flush the __consumer_offsets topic?

Are there best practices for this topic?

I have just set the offsets.retention.minutes=1, restarted the broker, checked in the log that offsets.retention.minutes=1 but the size of the 50 partitions of the __consumer_offsets topic is still the same.

Why?

Answer 1

offsets.retention.minutes only applies when __consumer_offsets doesn't exist already.

You'd change the retention like any other topic, going forward - Purge Kafka Topic , however "best practice" says to leave the topic alone and let the LogCleaner handle removing old consumer groups