jolshan commented on code in PR #13544:
URL: https://github.com/apache/kafka/pull/13544#discussion_r1178083579


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/RecordHelpers.java:
##########
@@ -0,0 +1,371 @@
+/*
+ * 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.
+ */
+package org.apache.kafka.coordinator.group;
+
+import org.apache.kafka.common.Uuid;
+import org.apache.kafka.coordinator.group.consumer.ConsumerGroupMember;
+import org.apache.kafka.coordinator.group.consumer.TopicMetadata;
+import 
org.apache.kafka.coordinator.group.generated.ConsumerGroupCurrentMemberAssignmentKey;
+import 
org.apache.kafka.coordinator.group.generated.ConsumerGroupCurrentMemberAssignmentValue;
+import 
org.apache.kafka.coordinator.group.generated.ConsumerGroupMemberMetadataKey;
+import 
org.apache.kafka.coordinator.group.generated.ConsumerGroupMemberMetadataValue;
+import org.apache.kafka.coordinator.group.generated.ConsumerGroupMetadataKey;
+import org.apache.kafka.coordinator.group.generated.ConsumerGroupMetadataValue;
+import 
org.apache.kafka.coordinator.group.generated.ConsumerGroupPartitionMetadataKey;
+import 
org.apache.kafka.coordinator.group.generated.ConsumerGroupPartitionMetadataValue;
+import 
org.apache.kafka.coordinator.group.generated.ConsumerGroupTargetAssignmentMemberKey;
+import 
org.apache.kafka.coordinator.group.generated.ConsumerGroupTargetAssignmentMemberValue;
+import 
org.apache.kafka.coordinator.group.generated.ConsumerGroupTargetAssignmentMetadataKey;
+import 
org.apache.kafka.coordinator.group.generated.ConsumerGroupTargetAssignmentMetadataValue;
+import org.apache.kafka.server.common.ApiMessageAndVersion;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+/**
+ * This class contains helper methods to create records stored in
+ * the __consumer_offsets topic.
+ */
+public class RecordHelpers {
+    private RecordHelpers() {}
+
+    /**
+     * Creates a ConsumerGroupMemberMetadata record.
+     *
+     * @param groupId   The consumer group id.
+     * @param member    The consumer group member.
+     * @return The record.
+     */
+    public static Record newMemberSubscriptionRecord(
+        String groupId,
+        ConsumerGroupMember member
+    ) {
+        return new Record(
+            new ApiMessageAndVersion(
+                new ConsumerGroupMemberMetadataKey()
+                    .setGroupId(groupId)
+                    .setMemberId(member.memberId()),
+                (short) 5
+            ),
+            new ApiMessageAndVersion(
+                new ConsumerGroupMemberMetadataValue()

Review Comment:
   Sorry if it was unclear -- we pass in ConsumerGroupMember but I wonder if it 
would be worth just passing in ConsumerGroupMemberMetadataValue. But I could be 
missing the whole path here.



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