splett2 commented on code in PR #18277:
URL: https://github.com/apache/kafka/pull/18277#discussion_r1936085535

##########
metadata/src/main/java/org/apache/kafka/controller/ClusterControlManager.java:
##########
@@ -422,7 +425,15 @@ public ControllerResult<BrokerRegistrationReply> 
registerBroker(
             record.setLogDirs(request.logDirs());
         }
 
-        if (!request.incarnationId().equals(prevIncarnationId)) {
+        boolean isUncleanShutdownRegistration;
+        if (uncleanShutdownDetectionEnabled) {
+            isUncleanShutdownRegistration = storedBrokerEpoch != 
request.previousBrokerEpoch();
+        } else {
+            isUncleanShutdownRegistration = 
!request.incarnationId().equals(prevIncarnationId);
+        }
+        boolean isBrokerStartUp = 
!request.incarnationId().equals(prevIncarnationId);
+
+        if (isUncleanShutdownRegistration) {

Review Comment:
   i don't think that's right. even if the broker shut down and restarted 
without data loss, we should perform ISR state/leadership transitions.
   
   i think the only behavior difference should be whether or not we remove the 
broker from the ELR? 



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