hachikuji commented on a change in pull request #9996:
URL: https://github.com/apache/kafka/pull/9996#discussion_r567106239



##########
File path: clients/src/main/java/org/apache/kafka/clients/admin/Admin.java
##########
@@ -1449,6 +1449,39 @@ default DescribeFeaturesResult describeFeatures() {
      */
     UpdateFeaturesResult updateFeatures(Map<String, FeatureUpdate> 
featureUpdates, UpdateFeaturesOptions options);
 
+    /**
+     * Unregisters a broker.

Review comment:
       We should document the fact that this will only work for self-managed 
kafka clusters. 

##########
File path: clients/src/main/java/org/apache/kafka/common/protocol/ApiKeys.java
##########
@@ -98,7 +98,8 @@
     UPDATE_FEATURES(ApiMessageType.UPDATE_FEATURES, false, true),
     ENVELOPE(ApiMessageType.ENVELOPE, true, RecordBatch.MAGIC_VALUE_V0, false, 
true),
     FETCH_SNAPSHOT(ApiMessageType.FETCH_SNAPSHOT, false, 
RecordBatch.MAGIC_VALUE_V0, false, true),
-    DESCRIBE_CLUSTER(ApiMessageType.DESCRIBE_CLUSTER);
+    DESCRIBE_CLUSTER(ApiMessageType.DESCRIBE_CLUSTER),
+    DECOMMISSION_BROKER(ApiMessageType.DECOMMISSION_BROKER, false, 
RecordBatch.MAGIC_VALUE_V0, true, true);

Review comment:
       This is not a controller-only API.

##########
File path: 
clients/src/main/resources/common/message/DecommissionBrokerResponse.json
##########
@@ -0,0 +1,28 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements.  See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License.  You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+{
+  "apiKey": 63,
+  "type": "response",
+  "name": "DecommissionBrokerResponse",
+  "validVersions": "0",
+  "flexibleVersions": "0+",
+  "fields": [
+    { "name": "ThrottleTimeMs", "type": "int32", "versions": "0+",
+      "about": "Duration in milliseconds for which the request was throttled 
due to a quota violation, or zero if the request did not violate any quota." },
+    { "name": "ErrorCode", "type": "int16", "versions": "0+",

Review comment:
       Considering if we may as well add an ErrorMessage field here.

##########
File path: 
clients/src/main/java/org/apache/kafka/clients/admin/KafkaAdminClient.java
##########
@@ -4503,6 +4506,47 @@ void handleFailure(Throwable throwable) {
         return new UpdateFeaturesResult(new HashMap<>(updateFutures));
     }
 
+    @Override
+    public DecommissionBrokerResult decommissionBroker(int brokerId, 
DecommissionBrokerOptions options) {
+        final KafkaFutureImpl<Void> future = new KafkaFutureImpl<>();
+        final long now = time.milliseconds();
+        final Call call = new Call("decommissionBroker", calcDeadlineMs(now, 
options.timeoutMs()),
+            new ControllerNodeProvider()) {

Review comment:
       Shouldn't we use `LeastLoadedNodeProvider`? The kip-500 controller will 
not be reachable anyway.

##########
File path: core/src/main/scala/kafka/server/KafkaApis.scala
##########
@@ -3296,6 +3298,13 @@ class KafkaApis(val requestChannel: RequestChannel,
     handle(forwardedRequest)
   }
 
+  def handleDecommissionBrokerRequest(request: RequestChannel.Request): Unit = 
{
+    val decommissionBrokerRequest = request.body[DecommissionBrokerRequest]
+    requestHelper.sendResponseMaybeThrottle(request, requestThrottleMs =>
+      decommissionBrokerRequest.getErrorResponse(requestThrottleMs,
+        Errors.UNSUPPORTED_VERSION.exception))

Review comment:
       If we advertise this API in the ApiVersions response, then it would be 
surprising to get an UNSUPPORTED_VERSION error. I think we might need augment 
the ApiVersion handler here so that we are able to exclude KIP-500 APIs when it 
is not enabled.

##########
File path: 
clients/src/main/java/org/apache/kafka/clients/admin/KafkaAdminClient.java
##########
@@ -4503,6 +4506,47 @@ void handleFailure(Throwable throwable) {
         return new UpdateFeaturesResult(new HashMap<>(updateFutures));
     }
 
+    @Override
+    public DecommissionBrokerResult decommissionBroker(int brokerId, 
DecommissionBrokerOptions options) {

Review comment:
       Can you add some unit tests for this api? Nice to cover at least the 
success/error cases.




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