Kafka Exception - kafka.common.InconsistentBrokerIdException

I came across this exception when I was working with Apache Kafka.

Scenario

Set up multiple Kafka brokers in a cluster. Copy the server.properties to create a new propeties file for the new broker. I was following the instructions here https://kafka.apache.org/documentation/#quickstart_multibroker

Result

The first broker started without error. When I started the second broker, I saw this exception - kafka.common.InconsistentBrokerIdException.

Resolution

I found that the cause was that when I copied the proerties file I had missed changing the "log.dirs" property. If the two brokers share the same "log.dirs" property then we get this error. I restarted the second instance with a unique value for "log.dirs" property. The issue was resolved.