dajac commented on code in PR #13329:
URL: https://github.com/apache/kafka/pull/13329#discussion_r1126920827


##########
core/src/main/scala/kafka/server/KafkaApis.scala:
##########
@@ -3573,9 +3573,27 @@ class KafkaApis(val requestChannel: RequestChannel,
 
   def handleConsumerGroupHeartbeat(request: RequestChannel.Request): 
CompletableFuture[Unit] = {
     val consumerGroupHeartbeatRequest = 
request.body[ConsumerGroupHeartbeatRequest]
-    // KIP-848 is not implemented yet so return UNSUPPORTED_VERSION.
-    requestHelper.sendMaybeThrottle(request, 
consumerGroupHeartbeatRequest.getErrorResponse(Errors.UNSUPPORTED_VERSION.exception))
-    CompletableFuture.completedFuture[Unit](())
+
+    if (!config.isNewGroupCoordinatorEnabled) {
+      // The API is not supported by the "old" group coordinator (the 
default). If the

Review Comment:
   good question. i think that we will likely bind the new coordinator to an 
IBP version.



##########
core/src/test/scala/unit/kafka/server/ConsumerGroupHeartbeatRequestTest.scala:
##########
@@ -54,6 +54,20 @@ class ConsumerGroupHeartbeatRequestTest(cluster: 
ClusterInstance) {
     assertEquals(expectedResponse, consumerGroupHeartbeatResponse.data)
   }
 
+  @ClusterTest(serverProperties = Array(
+    new ClusterConfigProperty(key = "unstable.api.versions.enable", value = 
"true"),
+    new ClusterConfigProperty(key = "group.coordinator.new.enable", value = 
"true")
+  ))
+  def 
testConsumerGroupHeartbeatIsAccessibleWhenNewGroupCoordinatorIsEnabled(): Unit 
= {
+    val consumerGroupHeartbeatRequest = new 
ConsumerGroupHeartbeatRequest.Builder(
+      new ConsumerGroupHeartbeatRequestData()
+    ).build()
+
+    val consumerGroupHeartbeatResponse = 
connectAndReceive(consumerGroupHeartbeatRequest)
+    val expectedResponse = new 
ConsumerGroupHeartbeatResponseData().setErrorCode(Errors.UNSUPPORTED_VERSION.code)

Review Comment:
   that's right.



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