jolshan commented on code in PR #12902:
URL: https://github.com/apache/kafka/pull/12902#discussion_r1069791363


##########
core/src/main/scala/kafka/coordinator/group/GroupCoordinatorAdapter.scala:
##########
@@ -470,4 +470,45 @@ class GroupCoordinatorAdapter(
       expireTimestamp = expireTimestamp
     )
   }
+
+  override def deleteOffsets(
+    context: RequestContext,
+    request: OffsetDeleteRequestData,
+    bufferSupplier: BufferSupplier
+  ): CompletableFuture[OffsetDeleteResponseData] = {
+    val future = new CompletableFuture[OffsetDeleteResponseData]()
+
+    val partitions = mutable.ArrayBuffer[TopicPartition]()
+    request.topics.forEach { topic =>
+      topic.partitions.forEach { partition =>
+        partitions += new TopicPartition(topic.name, partition.partitionIndex)
+      }
+    }
+
+    val (groupError, topicPartitionResults) = coordinator.handleDeleteOffsets(
+      request.groupId,
+      partitions,
+      RequestLocal(bufferSupplier)
+    )
+
+    if (groupError != Errors.NONE) {
+      future.completeExceptionally(groupError.exception)
+    } else {
+      val response = new OffsetDeleteResponseData()
+      topicPartitionResults.forKeyValue { (topicPartition, error) =>
+        var topic = response.topics.find(topicPartition.topic)

Review Comment:
   TIL that topics in this response are 
ImplicitLinkedHashMultiCollection.Elements. 😅 
   I'm curious why this specific response gets this typing compared to similar 
request/response jsons -- I guess its maybe the "map key". But good to know 
that this find operation works and is fairly efficient.



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