...

Currently, when using MetadataQuorumCommand to add a controller, users must provide a controller.properties configuration file. This file is required for the command to retrieve the metadata local path and endpoints needed to add voters. However, this approach has several limitations:

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The kafka-metadata-quorum.sh tool introduces a new option —-controller-id for the add-controller subcommand.

Adding a controller

This can only be done with bootstrap controller option since we can‘t use bootstrap.server in Admin#describeConfigs to get controller configs.

bin/kafka-metadata-quorum.sh --bootstrap-controller localhost:9093 add-controller --controller-id <id>

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diff --git a/tools/src/main/java/org/apache/kafka/tools/MetadataQuorumCommand.java b/tools/src/main/java/org/apache/kafka/tools/MetadataQuorumCommand.java
index dba7951aa4..f3bdbbeffa 100644
--- a/tools/src/main/java/org/apache/kafka/tools/MetadataQuorumCommand.java
+++ b/tools/src/main/java/org/apache/kafka/tools/MetadataQuorumCommand.java
@@ -471,7 +471,6 @@ public class MetadataQuorumCommand {
         removeControllerParser
             .addArgument("--controller-directory-id", "-d")
             .help("The directory ID of the controller to remove.")
-            .required(true)
             .action(Arguments.store());

• The —-controller_directory-id is no longer required. We can use Admin#describeMetadataQuorum method to get the controller directory UUID.

• If —-controller_directory-id is explicitly provided, it will be used directly, and Admin#describeMetadataQuorum will not be called.

Compatibility, Deprecation, and Migration Plan

This change should be backward compatible:

• The —-command-config option remains available in add-controller.

• The --controller-directory-id option in remove-controller is now optional but still supported.

Test Plan

New test cases will be added to MetadataQuorumCommandTest.java to validate:

• Adding a controller with --controller-id.

• Removing a controller without explicitly providing --controller-directory-id.

Rejected Alternatives

N/A