cmccabe commented on code in PR #16991:
URL: https://github.com/apache/kafka/pull/16991#discussion_r1742411462


##########
core/src/test/java/kafka/testkit/KafkaClusterTestKit.java:
##########
@@ -404,22 +423,44 @@ private void formatNode(
         boolean writeMetadataDirectory
     ) {
         try {
-            MetaPropertiesEnsemble.Copier copier =
-                new 
MetaPropertiesEnsemble.Copier(MetaPropertiesEnsemble.EMPTY);
-            for (Entry<String, MetaProperties> entry : 
ensemble.logDirProps().entrySet()) {
-                String logDir = entry.getKey();
-                if (writeMetadataDirectory || 
(!ensemble.metadataLogDir().equals(Optional.of(logDir)))) {
-                    log.trace("Adding {} to the list of directories to 
format.", logDir);
-                    copier.setLogDirProps(logDir, entry.getValue());
+            Formatter formatter = new Formatter();
+            formatter.setNodeId(ensemble.nodeId().getAsInt());
+            formatter.setClusterId(ensemble.clusterId().get());
+            if (writeMetadataDirectory) {
+                formatter.setDirectories(ensemble.logDirProps().keySet());
+            } else {
+                
formatter.setDirectories(ensemble.logDirProps().keySet().stream().
+                    filter(d -> !ensemble.metadataLogDir().get().equals(d)).
+                    collect(Collectors.toSet()));
+            }
+            if (formatter.directories().isEmpty()) {
+                return;
+            }
+            
formatter.setReleaseVersion(nodes.bootstrapMetadata().metadataVersion());
+            formatter.setFeatureLevel(KRaftVersion.FEATURE_NAME,
+                
nodes.bootstrapMetadata().featureLevel(KRaftVersion.FEATURE_NAME));
+            formatter.setUnstableFeatureVersionsEnabled(true);
+            formatter.setIgnoreFormatted(false);
+            formatter.setControllerListenerName("CONTROLLER");
+            if (writeMetadataDirectory) {
+                
formatter.setMetadataLogDirectory(ensemble.metadataLogDir().get());
+            } else {
+                formatter.setMetadataLogDirectory(Optional.empty());

Review Comment:
   Sorry, I'm not sure what you are proposing here.



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