mumrah opened a new pull request, #12036:
URL: https://github.com/apache/kafka/pull/12036
This PR includes the changes to feature flags that were outlined in KIP-778.
## Single finalized version level
The UpdateFeatures RPC and the FeatureLevelRecord were updated to remove the
max version level. Other changes to the RPC from KIP-778 include:
* Adding dry-run to the RPC so the controller can actually attempt the
upgrade (rather than the client)
* Introduce a upgrade type enum instead of "allowDowngrade" boolean
## kafka-features.sh changes
This tool was overhauled in KIP-778 and now includes sub-commands.
```
$ ./bin/kafka-features.sh --help
usage: kafka-features [-h] --bootstrap-server BOOTSTRAP_SERVER
[--command-config COMMAND_CONFIG] {describe,upgrade,downgrade,disable} ...
This tool manages feature flags in Kafka.
positional arguments:
{describe,upgrade,downgrade,disable}
describe Describe one or more feature flags.
upgrade Upgrade one or more feature flags.
downgrade Upgrade one or more feature flags.
disable Disable one or more feature flags. This is the same
as downgrading the version to zero.
optional arguments:
-h, --help show this help message and exit
--bootstrap-server BOOTSTRAP_SERVER
A comma-separated list of host:port pairs to use
for establishing the connection to the Kafka cluster.
--command-config COMMAND_CONFIG
Property file containing configs to be passed to
Admin Client.
```
Help output from the "upgrades" sub-command:
```
$ ./bin/kafka-features.sh upgrade --help
usage: kafka-features --bootstrap-server BOOTSTRAP_SERVER upgrade [-h]
[--feature FEATURE] [--version VERSION] [--release RELEASE] [--dry-run]
optional arguments:
-h, --help show this help message and exit
--dry-run Perform a dry-run of this upgrade operation.
Upgrade specific features:
--feature FEATURE A feature flag to upgrade. This option may be
repeated for upgrading multiple feature flags.
--version VERSION The version to upgrade to.
Upgrade to feature level defined for a given release:
--release RELEASE
```
Refer to
[KIP-778](https://cwiki.apache.org/confluence/display/KAFKA/KIP-778%3A+KRaft+Upgrades)
for more details on the new command structure.
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