cmccabe commented on code in PR #13372:
URL: https://github.com/apache/kafka/pull/13372#discussion_r1134596431


##########
metadata/src/main/java/org/apache/kafka/metadata/migration/KRaftMigrationDriver.java:
##########
@@ -269,15 +288,24 @@ public void close() throws Exception {
 
     // Events handled by Migration Driver.
     abstract class MigrationEvent implements EventQueue.Event {
+        @SuppressWarnings("ThrowableNotThrown")
         @Override
         public void handleException(Throwable e) {
-            if (e instanceof RejectedExecutionException) {
-                log.info("Not processing {} because the event queue is 
closed.", this);
+            if (e instanceof MigrationClientAuthException) {
+                
KRaftMigrationDriver.this.faultHandler.handleFault("Encountered client auth 
error in " + this, e);
+            } else if (e instanceof MigrationClientException) {
+                log.debug(String.format("Encountered client error during event 
%s. Will retry.", this), e.getCause());

Review Comment:
   I think this should be `info`... for now, at least.



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