dielhennr commented on a change in pull request #10480:
URL: https://github.com/apache/kafka/pull/10480#discussion_r610280789



##########
File path: 
raft/src/main/java/org/apache/kafka/raft/internals/BatchAccumulator.java
##########
@@ -202,6 +203,25 @@ private void completeCurrentBatch() {
         currentBatch = null;
     }
 
+    public void addControlBatch(MemoryRecords records) {
+        appendLock.lock();
+        try {
+            drainStatus = DrainStatus.STARTED;
+            completed.add(new CompletedBatch<>(
+                nextOffset,
+                null,

Review comment:
       If `Optional.empty` is used, the type argument can not be inferred for 
CompletedBatch. I got around this by using `Optional.ofNullable` in the 
constructor of CompletedBatch.




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