cadonna commented on code in PR #19181:
URL: https://github.com/apache/kafka/pull/19181#discussion_r1991827905


##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/StreamsGroupHeartbeatRequestManager.java:
##########
@@ -82,29 +97,41 @@ public StreamsGroupHeartbeatRequestData buildRequestData() {
             data.setMemberId(membershipManager.memberId());
             data.setMemberEpoch(membershipManager.memberEpoch());
             membershipManager.groupInstanceId().ifPresent(data::setInstanceId);
-            StreamsGroupHeartbeatRequestData.Topology topology = new 
StreamsGroupHeartbeatRequestData.Topology();
-            
topology.setSubtopologies(getTopologyFromStreams(streamsRebalanceData.subtopologies()));
-            topology.setEpoch(streamsRebalanceData.topologyEpoch());
-            data.setRebalanceTimeoutMs(rebalanceTimeoutMs);
-            data.setTopology(topology);
-            data.setProcessId(streamsRebalanceData.processId().toString());
-            streamsRebalanceData.endpoint().ifPresent(userEndpoint -> {
-                data.setUserEndpoint(new 
StreamsGroupHeartbeatRequestData.Endpoint()
-                    .setHost(userEndpoint.host())
-                    .setPort(userEndpoint.port())
-                );
-            });
-            
data.setClientTags(streamsRebalanceData.clientTags().entrySet().stream()
-                .map(entry -> new StreamsGroupHeartbeatRequestData.KeyValue()
-                    .setKey(entry.getKey())
-                    .setValue(entry.getValue())
-                )
-                .collect(Collectors.toList()));
+
+            boolean joining = membershipManager.state() == MemberState.JOINING;
+
+            if (joining) {
+                StreamsGroupHeartbeatRequestData.Topology topology = new 
StreamsGroupHeartbeatRequestData.Topology();
+                
topology.setSubtopologies(getTopologyFromStreams(streamsRebalanceData.subtopologies()));
+                topology.setEpoch(streamsRebalanceData.topologyEpoch());
+                data.setTopology(topology);
+                data.setRebalanceTimeoutMs(rebalanceTimeoutMs);
+                data.setProcessId(streamsRebalanceData.processId().toString());
+                streamsRebalanceData.endpoint().ifPresent(userEndpoint -> {
+                    data.setUserEndpoint(new 
StreamsGroupHeartbeatRequestData.Endpoint()
+                        .setHost(userEndpoint.host())
+                        .setPort(userEndpoint.port())
+                    );
+                });
+                
data.setClientTags(streamsRebalanceData.clientTags().entrySet().stream()
+                    .map(entry -> new 
StreamsGroupHeartbeatRequestData.KeyValue()
+                        .setKey(entry.getKey())
+                        .setValue(entry.getValue())
+                    )
+                    .collect(Collectors.toList()));
+                data.setActiveTasks(convertTaskIdCollection(Set.of()));

Review Comment:
   The protocol specifies that the assignment needs to consists of empty sets 
when joining. The heartbeat handler broker side distinguishes between an empty 
assignment and an assignment that was not sent in the heartbeat. 



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