Yunyung commented on code in PR #20372:
URL: https://github.com/apache/kafka/pull/20372#discussion_r2283783540


##########
tools/src/main/java/org/apache/kafka/tools/LogCompactionTester.java:
##########
@@ -408,8 +410,9 @@ producerProps, new ByteArraySerializer(), new 
ByteArraySerializer())) {
 
             try (BufferedWriter producedWriter = Files.newBufferedWriter(
                     producedFilePath, StandardCharsets.UTF_8)) {
-                for (long i = 0; i < messages * topics.length; i++) {
-                    String topic = topics[(int) (i % topics.length)];
+                String[] topicsArray = topics.toArray(new String[0]);

Review Comment:
   How about 
   List<String> topicsList = List.copyOf(topics); 
   ...
   String topic = topicList.get((int) (i % size));



##########
tools/src/main/java/org/apache/kafka/tools/LogCompactionTester.java:
##########
@@ -430,14 +433,14 @@ record = new ProducerRecord<>(topic,
         }
     }
 
-    private static Path consumeMessages(String brokerUrl, String[] topics) 
throws IOException {
+    private static Path consumeMessages(String brokerUrl, Set<String> topics) 
throws IOException {
 
         Path consumedFilePath = 
Files.createTempFile("kafka-log-cleaner-consumed-", ".txt");
         System.out.println("Logging consumed messages to " + consumedFilePath);
 
         try (Consumer<String, String> consumer = createConsumer(brokerUrl);
              BufferedWriter consumedWriter = 
Files.newBufferedWriter(consumedFilePath, StandardCharsets.UTF_8)) {
-            consumer.subscribe(Arrays.asList(topics));
+            consumer.subscribe(new ArrayList<>(topics));

Review Comment:
   We can use `consumer.subscribe(topics)` directly;
   



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