This PR implements a basic CLI tool for feature versioning system. The KIP-584 write up has been updated to suit this PR. The following is implemented in this PR:
--describe:
Describe supported and finalized features.
Usage: $> ./bin/kafka-features.sh --bootstrap-server host1:port1, host2:port2 --describe [--from-controller] [--command-config <path_to_java_properties_file>]
Optionally, use the --from-controller option to get features from the controller.
--upgrade-all:
Upgrades all features known to the tool to their highest max version levels.
Usage: $> ./bin/kafka-features.sh --bootstrap-server host1:port1, host2:port2 --upgrade-all [--dry-run] [--command-config <path_to_java_properties_file>]
Optionally, use the --dry-run CLI option to preview the feature updates without actually applying them.
--downgrade-all:
Downgrades existing finalized features to the highest max version levels known to this tool.
Usage: $> ./bin/kafka-features.sh --bootstrap-server host1:port1, host2:port2 --downgrade-all [--dry-run] [--command-config <path_to_java_properties_file>].
Optionally, use the --dry-run CLI option to preview the feature updates without actually applying them.
Reviewers: Boyang Chen <boyang@confluent.io>, Jun Rao <junrao@gmail.com>
Kowshik Prakasam