cmccabe commented on code in PR #13407:
URL: https://github.com/apache/kafka/pull/13407#discussion_r1173091174


##########
metadata/src/main/java/org/apache/kafka/metadata/migration/KRaftMigrationDriver.java:
##########
@@ -396,18 +418,36 @@ class WaitForControllerQuorumEvent extends MigrationEvent 
{
 
         @Override
         public void run() throws Exception {
-            switch (migrationState) {
-                case WAIT_FOR_CONTROLLER_QUORUM:
-                    if (isControllerQuorumReadyForMigration()) {
-                        log.debug("Controller Quorum is ready for Zk to KRaft 
migration");
-                        // Note that leadership would not change here. Hence 
we do not need to
-                        // `apply` any leadership state change.
-                        transitionTo(MigrationDriverState.WAIT_FOR_BROKERS);
+            if 
(migrationState.equals(MigrationDriverState.WAIT_FOR_CONTROLLER_QUORUM)) {
+                if (!firstPublish) {
+                    log.trace("Waiting until we have received metadata before 
proceeding with migration");
+                    return;
+                }
+
+                ZkMigrationState zkMigrationState = 
image.features().zkMigrationState();

Review Comment:
   we can have a switch statement here right?



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