jolshan commented on code in PR #12845:
URL: https://github.com/apache/kafka/pull/12845#discussion_r1028449377


##########
core/src/main/scala/kafka/server/KafkaApis.scala:
##########
@@ -1647,69 +1656,51 @@ class KafkaApis(val requestChannel: RequestChannel,
     }
   }
 
-  def handleJoinGroupRequest(request: RequestChannel.Request, requestLocal: 
RequestLocal): Unit = {
-    val joinGroupRequest = request.body[JoinGroupRequest]
+  private def makeGroupCoordinatorRequestContext(
+    request: RequestChannel.Request,
+    requestLocal: RequestLocal
+  ): GroupCoordinatorRequestContext = {
+    new GroupCoordinatorRequestContext(
+      request.context.header.data.requestApiVersion,
+      request.context.header.data.clientId,
+      request.context.clientAddress,
+      requestLocal.bufferSupplier
+    )
+  }
 
-    // the callback for sending a join-group response
-    def sendResponseCallback(joinResult: JoinGroupResult): Unit = {
-      def createResponse(requestThrottleMs: Int): AbstractResponse = {
-        val responseBody = new JoinGroupResponse(
-          new JoinGroupResponseData()
-            .setThrottleTimeMs(requestThrottleMs)
-            .setErrorCode(joinResult.error.code)
-            .setGenerationId(joinResult.generationId)
-            .setProtocolType(joinResult.protocolType.orNull)
-            .setProtocolName(joinResult.protocolName.orNull)
-            .setLeader(joinResult.leaderId)
-            .setSkipAssignment(joinResult.skipAssignment)
-            .setMemberId(joinResult.memberId)
-            .setMembers(joinResult.members.asJava),
-          request.context.apiVersion
-        )
+  def handleJoinGroupRequest(
+    request: RequestChannel.Request,
+    requestLocal: RequestLocal
+  ): CompletableFuture[Unit] = {

Review Comment:
   I don't have a strong opinion on callback vs future (maybe a slight bias for 
me towards callbacks because I'm more familiar, but not a good reason to change 
the design) but I do think it makes sense to be consistent. If we plan on using 
futures in the new controller interface then we can go ahead with using futures 
here too.



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