a bit more on kafka partitions
Look at Kafka partitions and replication factor by tracking log sizes.
ls -al /tmp/kafka-logs/MySecondTopic-0 (looks at first partition on Broker 0)
ls -al /tmp/kafka-logs-2/MySecondTopic-0 (same partition on Broker 2)
ls -al /tmp/kafka-logs/MySecondTopic-1 (partition 1 on Broker-0)