guozhangwang commented on code in PR #12972:
URL: https://github.com/apache/kafka/pull/12972#discussion_r1099081262


##########
clients/src/main/resources/common/message/ConsumerGroupHeartbeatRequest.json:
##########
@@ -0,0 +1,66 @@
+// 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": 68,
+  "type": "request",
+  "apiStability": "evolving",
+  "listeners": ["zkBroker", "broker"],
+  "name": "ConsumerGroupHeartbeatRequest",
+  "validVersions": "0",
+  "flexibleVersions": "0+",
+  "fields": [
+    { "name": "GroupId", "type": "string", "versions": "0+", "entityType": 
"groupId",
+      "about": "The group identifier." },
+    { "name": "MemberId", "type": "string", "versions": "0+",
+      "about": "The member id generated by the coordinator. The member id must 
be kept during the entire lifetime of the member." },
+    { "name": "MemberEpoch", "type": "int32", "versions": "0+",
+      "about": "The current member epoch; 0 to join the group; -1 to leave the 
group; -2 to indicate that the static member will rejoin." },
+    { "name": "InstanceId", "type": "string", "versions": "0+", 
"nullableVersions": "0+", "default": "null",
+      "about": "null if not provided or if it didn't change since the last 
heartbeat; the instance Id otherwise." },
+    { "name": "RackId", "type": "string", "versions": "0+",  
"nullableVersions": "0+", "default": "null",
+      "about": "null if not provided or if it didn't change since the last 
heartbeat; the rack ID of consumer otherwise." },
+    { "name": "RebalanceTimeoutMs", "type": "int32", "versions": "0+", 
"default": -1,
+      "about": "-1 if it didn't chance since the last heartbeat; the maximum 
time in milliseconds that the coordinator will wait on the member to revoke its 
partitions otherwise." },
+    { "name": "SubscribedTopicNames", "type": "[]string", "versions": "0+", 
"nullableVersions": "0+", "default": "null",
+      "about": "null if it didn't change since the last heartbeat; the 
subscribed topic names otherwise." },
+    { "name": "SubscribedTopicRegex", "type": "string", "versions": "0+", 
"nullableVersions": "0+", "default": "null",
+      "about": "null if it didn't change since the last heartbeat; the 
subscribed topic regex otherwise" },
+    { "name": "ServerAssignor", "type": "string", "versions": "0+", 
"nullableVersions": "0+", "default": "null",
+      "about": "null if not used or if it didn't change since the last 
heartbeat; the server side assignor to use otherwise." },
+    { "name": "ClientAssignors", "type": "[]Assignor", "versions": "0+", 
"nullableVersions": "0+", "default": "null",
+      "about": "null if not used or if it didn't change since the last 
heartbeat; the list of client-side assignors otherwise.", "fields": [
+      { "name": "Name", "type": "string", "versions": "0+",
+        "about": "The name of the assignor." },
+      { "name": "MinimumVersion", "type": "int16", "versions": "0+",
+        "about": "The minimum supported version for the metadata." },
+      { "name": "MaximumVersion", "type": "int16", "versions": "0+",
+        "about": "The maximum supported version for the metadata." },
+      { "name": "Reason", "type": "int8", "versions": "0+",

Review Comment:
   It just occurs to me: shall we reserve some numbers for AK client usage? I 
know that in the KIP we did not do so, for Streams e.g. it can start with 
reason 0 for its own meaning. But thinking about this a bit more I'm wondering 
if some common reasons that are used by consumer clients directly should be 
reserved? E.g. re-discover coordinator after disconnect, subscription changes, 
etc.



##########
core/src/test/scala/unit/kafka/server/ApiVersionManagerTest.scala:
##########
@@ -40,10 +40,15 @@ class ApiVersionManagerTest {
       listenerType = apiScope,
       forwardingManager = None,
       features = brokerFeatures,
-      metadataCache = metadataCache
+      metadataCache = metadataCache,
+      enableUnstableLastVersion = true

Review Comment:
   +1



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