See how a minor change to your commit message style can make you a better programmer.
Format: <type>(<scope>): <subject>
<scope> is optional
bin/kafka-topics.sh --zookeeper localhost:2181 --list
bin/kafka-topics.sh --zookeeper localhost:2181 --describe --topic mytopic
bin/kafka-topics.sh --zookeeper localhost:2181 --alter --topic mytopic --config retention.ms=1000
... wait a minute ...