chia7712 commented on code in PR #18165:
URL: https://github.com/apache/kafka/pull/18165#discussion_r1937733425


##########
clients/src/main/java/org/apache/kafka/clients/admin/KafkaAdminClient.java:
##########
@@ -4081,7 +4084,9 @@ void handleFailure(Throwable throwable) {
     }
 
     private void handleNotControllerError(AbstractResponse response) throws 
ApiException {
-        if (response.errorCounts().containsKey(Errors.NOT_CONTROLLER)) {
+        // When sending requests directly to the follower controller, it might 
return NOT_LEADER_OR_FOLLOWER error.
+        if (response.errorCounts().containsKey(Errors.NOT_CONTROLLER) ||
+                metadataManager.usingBootstrapControllers() && 
response.errorCounts().containsKey(Errors.NOT_LEADER_OR_FOLLOWER)) {
             handleNotControllerError(Errors.NOT_CONTROLLER);

Review Comment:
   Should we pass `NOT_LEADER_OR_FOLLOWER` instead of `NOT_CONTROLLER` when it 
encounters the error `NOT_LEADER_OR_FOLLOWER`?



##########
clients/src/test/java/org/apache/kafka/clients/admin/AdminClientUnitTestEnv.java:
##########
@@ -71,9 +71,13 @@ public AdminClientUnitTestEnv(Time time, Cluster cluster, 
Map<String, Object> co
         this.cluster = cluster;
         AdminClientConfig adminClientConfig = new AdminClientConfig(config);
 
+        boolean usingBootstrapController = false;
+        if 
(config.containsKey(AdminClientConfig.BOOTSTRAP_CONTROLLERS_CONFIG)) {
+            usingBootstrapController = true;
+        }
         AdminMetadataManager metadataManager = new AdminMetadataManager(new 
LogContext(),
                 
adminClientConfig.getLong(AdminClientConfig.RETRY_BACKOFF_MS_CONFIG),
-                
adminClientConfig.getLong(AdminClientConfig.METADATA_MAX_AGE_CONFIG), false);
+                
adminClientConfig.getLong(AdminClientConfig.METADATA_MAX_AGE_CONFIG), 
usingBootstrapController);

Review Comment:
   we can replace `usingBootstrapController` by 
`config.containsKey(AdminClientConfig.BOOTSTRAP_CONTROLLERS_CONFIG)` to 
streamline it



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