jsancio commented on code in PR #14807:
URL: https://github.com/apache/kafka/pull/14807#discussion_r1400991206


##########
metadata/src/test/java/org/apache/kafka/image/ClusterImageTest.java:
##########
@@ -205,4 +207,22 @@ private static List<ApiMessageAndVersion> 
getImageRecords(ClusterImage image) {
         image.write(writer, new ImageWriterOptions.Builder().build());
         return writer.records();
     }
+
+    @Test
+    public void testHandleLossOfControllerRegistrations() {
+        ClusterImage testImage = new ClusterImage(Collections.emptyMap(),
+            Collections.singletonMap(1000, new 
ControllerRegistration.Builder().
+                setId(1000).
+                setIncarnationId(Uuid.fromString("9ABu6HEgRuS-hjHLgC4cHw")).
+                setListeners(Collections.singletonMap("PLAINTEXT",
+                    new Endpoint("PLAINTEXT", SecurityProtocol.PLAINTEXT, 
"localhost", 19092))).
+                setSupportedFeatures(Collections.emptyMap()).build()));
+        RecordListWriter writer = new RecordListWriter();
+        final AtomicReference<String> lossString = new AtomicReference<>("");
+        testImage.write(writer, new ImageWriterOptions.Builder().
+            setMetadataVersion(MetadataVersion.IBP_3_6_IV2).
+            setLossHandler(loss -> lossString.compareAndSet("controller 
registration data", loss.loss())).
+                build());
+        assertEquals("", lossString.get());

Review Comment:
   Does this pass? Looking at `MetadataVersion`, controller registration 
support was added in `3.7-IV0`. I would expect that since this test sets the MV 
to `3.6-IV2`, this test would call the loss handler.
   
   Can we also add a test where the controller registration record is included 
to the snapshot?



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