jeffkbkim commented on code in PR #14985:
URL: https://github.com/apache/kafka/pull/14985#discussion_r1433038616


##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/runtime/SnapshottableCoordinator.java:
##########
@@ -111,6 +112,22 @@ public synchronized void replay(
         coordinator.replay(producerId, producerEpoch, record);
     }
 
+    /**
+     * Applies the transaction end marker.

Review Comment:
   nit: end transaction marker



##########
core/src/main/scala/kafka/coordinator/group/CoordinatorLoaderImpl.scala:
##########
@@ -135,7 +136,22 @@ class CoordinatorLoaderImpl[T](
 
             memoryRecords.batches.forEach { batch =>
               if (batch.isControlBatch) {
-                throw new IllegalStateException("Control batches are not 
supported yet.")
+                batch.asScala.foreach { record =>
+                  val controlRecord = ControlRecordType.parse(record.key)
+                  if (controlRecord == ControlRecordType.COMMIT) {
+                    coordinator.replayTransactionEndMarker(

Review Comment:
   can we rename all `replayTransactionEndMarker` to 
`replayEndTransactionMarker`?



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