tinaselenge commented on code in PR #13373:
URL: https://github.com/apache/kafka/pull/13373#discussion_r1144958881


##########
connect/mirror/src/main/java/org/apache/kafka/connect/mirror/MirrorSourceConnector.java:
##########
@@ -514,6 +540,37 @@ private void updateTopicConfigs(Map<String, Config> 
topicConfigs) {
         }));
     }
 
+    // visible for testing
+    void incrementalAlterConfigs(Map<String, Config> topicConfigs) {
+        Map<ConfigResource, Collection<AlterConfigOp>> configOps = new 
HashMap<>();
+        for (Map.Entry<String, Config> topicConfig : topicConfigs.entrySet()) {
+            Collection<AlterConfigOp> ops = new ArrayList<>();
+            ConfigResource configResource = new 
ConfigResource(ConfigResource.Type.TOPIC, topicConfig.getKey());
+            for (ConfigEntry config : topicConfig.getValue().entries()) {
+                if (config.isDefault() && 
!shouldReplicateSourceDefault(config.source())) {
+                    ops.add(new AlterConfigOp(config, 
AlterConfigOp.OpType.DELETE));
+                } else {
+                    ops.add(new AlterConfigOp(config, 
AlterConfigOp.OpType.SET));
+                }
+            }
+            configOps.put(configResource, ops);
+        }
+        log.trace("Syncing configs for {} topics.", configOps.size());
+        
targetAdminClient.incrementalAlterConfigs(configOps).values().forEach((k, v) -> 
v.whenComplete((x, e) -> {
+            if (e != null) {
+                if 
(useIncrementalAlterConfigs.equals(MirrorSourceConfig.USE_INCREMENTAL_ALTER_CONFIG_DEFAULT)

Review Comment:
   Ah thank you. I should have spotted the initialize() function! 



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