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Some users run controllers and brokers on the same machine (not containerized, but through tarballs, etc) and with ZooKeeper, they can independently start/stop the ZooKeeper controller and Kafka broker since there were specific shell scripts for each. However in KRaft mode, they can't start and stop the KRaft controller independently from the Kafka broker. We need to provide a way for users to kill either controllers or brokers.

Public Interfaces

Briefly list any new interfaces that will be introduced as part of this proposal or any existing interfaces that will be removed or changed. The purpose of this section is to concisely call out the public contract that will come along with this feature.

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The command line for killing controllers/brokers with change. Instead of simply running 

./bin/kafka-server-stop.sh

• Binary log format

• The network protocol and api behavior

• Any class in the public packages under clientsConfiguration, especially client configuration

  • org/apache/kafka/common/serialization

  • org/apache/kafka/common

  • org/apache/kafka/common/errors

  • org/apache/kafka/clients/producer

  • org/apache/kafka/clients/consumer (eventually, once stable)

• Monitoring

• Command line tools and arguments

• Anything else that will likely break existing users in some way when they upgrade

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