mingyen066 commented on code in PR #20040:
URL: https://github.com/apache/kafka/pull/20040#discussion_r2173250668


##########
coordinator-common/src/test/java/org/apache/kafka/coordinator/common/runtime/CoordinatorRuntimeTest.java:
##########
@@ -2940,6 +2942,135 @@ public void testAppendRecordBatchSize() {
         assertTrue(batchSize > MIN_BUFFER_SIZE && batchSize < maxBatchSize);
     }
 
+    @Test
+    public void testCoordinatorDoNotRetainLargeBuffer() {
+        MockTimer timer = new MockTimer();
+        InMemoryPartitionWriter mockWriter = new 
InMemoryPartitionWriter(false) {
+            @Override
+            public LogConfig config(TopicPartition tp) {
+                var props = new Properties();
+                props.put(TopicConfig.MAX_MESSAGE_BYTES_CONFIG, 
String.valueOf(1024 * 1024)); // 1MB
+                return new LogConfig(props);
+            }
+
+            @Override
+            public long append(
+                TopicPartition tp,
+                VerificationGuard verificationGuard,
+                MemoryRecords batch
+            ) {
+                return super.append(tp, verificationGuard, batch);
+            }

Review Comment:
   My mistake — I meant to use MockPartitionWriter, but after replacing it with 
InMemoryPartitionWriter, I forgot to clean it up.



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