dongnuo123 commented on code in PR #15268:
URL: https://github.com/apache/kafka/pull/15268#discussion_r1467804300


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java:
##########
@@ -3467,6 +3476,358 @@ public void maybeDeleteGroup(String groupId, 
List<Record> records) {
         }
     }
 
+    private JoinGroupRequestProtocol throwIfProtocolUnmatched(
+        ConsumerGroupMember member,
+        JoinGroupRequestData.JoinGroupRequestProtocolCollection protocols
+    ) {
+        for (JoinGroupRequestData.JoinGroupRequestProtocol protocol : 
protocols) {
+            final ByteBuffer buffer = ByteBuffer.wrap(protocol.metadata());
+            ConsumerProtocol.deserializeVersion(buffer);
+            final Optional<Integer> generationId = 
ConsumerProtocol.deserializeSubscription(buffer, (short) 0).generationId();
+
+            // If the generation id is provided, it must match the member 
epoch.
+            if (!generationId.isPresent() || generationId.get() == 
member.memberEpoch()) {
+                // TODO: need a list of all available server assignors
+                if 
(UniformAssignor.UNIFORM_ASSIGNOR_NAME.equals(protocol.name())
+                    || 
RangeAssignor.RANGE_ASSIGNOR_NAME.equals(protocol.name())) {
+                    return protocol;
+                }
+            }
+        }
+        throw new FencedMemberEpochException("The JoinGroup request doesn't 
have a matched generation id from a " +
+            "protocol supported by the server assignors with the epoch of the 
member known by the group coordinator (" +
+            member.memberEpoch() + ").");

Review Comment:
   not supported by the old protocol



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