chia7712 commented on code in PR #18929:
URL: https://github.com/apache/kafka/pull/18929#discussion_r2083236898


##########
clients/src/main/java/org/apache/kafka/common/requests/AlterShareGroupOffsetsRequest.java:
##########
@@ -78,6 +78,24 @@ public static AlterShareGroupOffsetsRequest parse(Readable 
readable, short versi
         );
     }
 
+    public static 
AlterShareGroupOffsetsResponseData.AlterShareGroupOffsetsResponseTopic 
getErrorAlterShareGroup(

Review Comment:
   Maybe we could inline this method



##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupCoordinatorService.java:
##########
@@ -1172,6 +1204,37 @@ public CompletableFuture<List<DescribedGroup>> 
shareGroupDescribe(
         return FutureUtils.combineFutures(futures, ArrayList::new, 
List::addAll);
     }
 
+    /**
+     * See {@link 
GroupCoordinator#alterShareGroupOffsets(AuthorizableRequestContext, String, 
AlterShareGroupOffsetsRequestData)}.
+     */
+    @Override
+    public CompletableFuture<AlterShareGroupOffsetsResponseData> 
alterShareGroupOffsets(AuthorizableRequestContext context, String groupId, 
AlterShareGroupOffsetsRequestData request) {
+        if (!isActive.get() || metadataImage == null) {
+            return CompletableFuture.completedFuture(
+                
AlterShareGroupOffsetsRequest.from(Errors.COORDINATOR_NOT_AVAILABLE));

Review Comment:
   Could we return `CompletableFuture.failedFuture`? The exception could be 
handled by `handleAlterShareGroupOffsetsRequest` instead



##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupCoordinatorService.java:
##########
@@ -1172,6 +1204,37 @@ public CompletableFuture<List<DescribedGroup>> 
shareGroupDescribe(
         return FutureUtils.combineFutures(futures, ArrayList::new, 
List::addAll);
     }
 
+    /**
+     * See {@link 
GroupCoordinator#alterShareGroupOffsets(AuthorizableRequestContext, String, 
AlterShareGroupOffsetsRequestData)}.
+     */
+    @Override
+    public CompletableFuture<AlterShareGroupOffsetsResponseData> 
alterShareGroupOffsets(AuthorizableRequestContext context, String groupId, 
AlterShareGroupOffsetsRequestData request) {
+        if (!isActive.get() || metadataImage == null) {
+            return CompletableFuture.completedFuture(
+                
AlterShareGroupOffsetsRequest.from(Errors.COORDINATOR_NOT_AVAILABLE));
+        }
+        
+        if (groupId == null) {
+            return CompletableFuture.completedFuture(
+                AlterShareGroupOffsetsRequest.from(Errors.GROUP_ID_NOT_FOUND));

Review Comment:
   ditto



##########
core/src/main/scala/kafka/server/KafkaApis.scala:
##########
@@ -3620,7 +3620,50 @@ class KafkaApis(val requestChannel: RequestChannel,
 
   def handleAlterShareGroupOffsetsRequest(request: RequestChannel.Request): 
Unit = {
     val alterShareGroupOffsetsRequest = 
request.body[AlterShareGroupOffsetsRequest]
-    requestHelper.sendMaybeThrottle(request, 
alterShareGroupOffsetsRequest.getErrorResponse(Errors.UNSUPPORTED_VERSION.exception))
+    val groupId = alterShareGroupOffsetsRequest.data.groupId
+
+    if (!isShareGroupProtocolEnabled) {
+      requestHelper.sendMaybeThrottle(request, 
alterShareGroupOffsetsRequest.getErrorResponse(Errors.UNSUPPORTED_VERSION.exception))
+    } else if (!authHelper.authorize(request.context, READ, GROUP, groupId)) {
+      requestHelper.sendMaybeThrottle(request, 
alterShareGroupOffsetsRequest.getErrorResponse(Errors.GROUP_AUTHORIZATION_FAILED.exception))
+    } else {
+      val responseBuilder = new AlterShareGroupOffsetsResponse.Builder()
+      val authorizedTopicPartitions = new 
AlterShareGroupOffsetsRequestData.AlterShareGroupOffsetsRequestTopicCollection()
+
+      alterShareGroupOffsetsRequest.data.topics.forEach(topic => {
+        val invalidTopicError = checkValidTopic(topic.topicName())
+        val topicError = invalidTopicError.orElse {
+          if (!authHelper.authorize(request.context, READ, TOPIC, 
topic.topicName())) {
+            Some(new ApiError(Errors.TOPIC_AUTHORIZATION_FAILED))
+          } else if (!metadataCache.contains(topic.topicName())) {
+            Some(new ApiError(Errors.UNKNOWN_TOPIC_OR_PARTITION))
+          } else {
+            None
+          }
+        }
+        topicError match {
+          case Some(error) =>
+            topic.partitions().forEach(partition => 
responseBuilder.addPartition(topic.topicName(), partition.partitionIndex(), 
error.error))
+          case None =>
+            authorizedTopicPartitions.add(topic)
+        }
+      })
+
+      val data = new AlterShareGroupOffsetsRequestData()
+        .setGroupId(groupId)
+        .setTopics(authorizedTopicPartitions)
+      groupCoordinator.alterShareGroupOffsets(
+        request.context,
+        groupId,
+        data
+      ).handle[Unit] { (response, exception) =>
+        if (exception != null) {
+          requestHelper.sendMaybeThrottle(request, 
alterShareGroupOffsetsRequest.getErrorResponse(exception))
+        } else {
+          requestHelper.sendMaybeThrottle(request, 
responseBuilder.merge(response).build())
+        }
+      }
+    }
     CompletableFuture.completedFuture[Unit](())

Review Comment:
   not sure why share-related APIs don't return `CompletableFuture` to chain 
`.exceptionally(handleError)`. 
   @AndrewJSchofield @apoorvmittal10 Is it expected behavior?



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