Rancho-7 commented on code in PR #20301:
URL: https://github.com/apache/kafka/pull/20301#discussion_r2254494101


##########
tools/src/main/java/org/apache/kafka/tools/EndToEndLatency.java:
##########
@@ -221,4 +303,156 @@ private static KafkaProducer<byte[], byte[]> 
createKafkaProducer(Optional<String
         producerProps.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, 
"org.apache.kafka.common.serialization.ByteArraySerializer");
         return new KafkaProducer<>(producerProps);
     }
+
+    // Visible for testing
+    static String[] convertLegacyArgsIfNeeded(String[] args) throws Exception {
+        if (args.length == 0) {
+            return args;
+        }
+
+        boolean hasNamedArgs = Arrays.stream(args).anyMatch(arg -> 
arg.startsWith("--"));
+        if (hasNamedArgs) {
+            return args;
+        }
+
+        if (args.length != 5 && args.length != 6) {
+            throw new TerseException("Invalid number of arguments. Expected 5 
or 6 positional arguments, but got " + args.length + ". " +
+                    "Usage: bootstrap-server topic num-records producer-acks 
record-size [optional] command-config");
+        }
+
+        return convertLegacyArgs(args);
+    }
+
+    private static String[] convertLegacyArgs(String[] legacyArgs) {
+        List<String> newArgs = new ArrayList<>();
+
+        // broker_list -> --bootstrap-server
+        newArgs.add("--bootstrap-server");
+        newArgs.add(legacyArgs[0]);
+
+        // topic -> --topic
+        newArgs.add("--topic");
+        newArgs.add(legacyArgs[1]);
+
+        // num_messages -> --num-records
+        newArgs.add("--num-records");
+        newArgs.add(legacyArgs[2]);
+
+        // producer_acks -> --producer-acks
+        newArgs.add("--producer-acks");
+        newArgs.add(legacyArgs[3]);
+
+        // message_size_bytes -> --record-size
+        newArgs.add("--record-size");
+        newArgs.add(legacyArgs[4]);
+
+        // properties_file -> --command-config
+        if (legacyArgs.length == 6 && !legacyArgs[5].trim().isEmpty()) {
+            newArgs.add("--command-config");
+            newArgs.add(legacyArgs[5]);
+        }
+        System.out.println("WARNING: Positional argument usage is deprecated 
and will be removed in Apache Kafka 5.0. " +
+                "Please use named arguments instead: --bootstrap-server, 
--topic, --num-records, --producer-acks, --record-size, --command-config");
+        return newArgs.toArray(new String[0]);
+    }
+
+    public static final class EndToEndLatencyCommandOptions extends 
CommandDefaultOptions {
+        final OptionSpec<String> bootstrapServerOpt;
+        final OptionSpec<String> topicOpt;
+        final OptionSpec<Integer> numRecordsOpt;
+        final OptionSpec<String> acksOpt;
+        final OptionSpec<Integer> recordSizeOpt;
+        final OptionSpec<String> commandConfigOpt;
+        final OptionSpec<Integer> recordKeyOpt;
+        final OptionSpec<Integer> recordHeaderValueSizeOpt;
+        final OptionSpec<Integer> recordHeaderKeySizeOpt;
+        final OptionSpec<Integer> numHeadersOpt;
+
+        public EndToEndLatencyCommandOptions(String[] args) {
+            super(args);
+
+            bootstrapServerOpt = parser.accepts("bootstrap-server", "REQUIRED: 
The Kafka broker list string in the form HOST1:PORT1,HOST2:PORT2.")
+                    .withRequiredArg()
+                    .describedAs("bootstrap-server")
+                    .ofType(String.class);
+            topicOpt = parser.accepts("topic", "REQUIRED: The topic to use for 
the test.")
+                    .withRequiredArg()
+                    .describedAs("topic-name")
+                    .ofType(String.class);
+            numRecordsOpt = parser.accepts("num-records", "REQUIRED: The 
number of messages to send.")
+                    .withRequiredArg()
+                    .describedAs("count")
+                    .ofType(Integer.class);
+            acksOpt = parser.accepts("producer-acks", "REQUIRED: Producer 
acknowledgements. Must be '1' or 'all'.")
+                    .withRequiredArg()
+                    .describedAs("producer-acks")
+                    .ofType(String.class);
+            recordSizeOpt = parser.accepts("record-size", "REQUIRED: The size 
of each message payload in bytes.")
+                    .withRequiredArg()
+                    .describedAs("bytes")
+                    .ofType(Integer.class);
+            recordKeyOpt = parser.accepts("record-key-size", "Optional: The 
size of the message key in bytes. If not set, messages are sent without a key.")
+                    .withOptionalArg()
+                    .describedAs("bytes")
+                    .ofType(Integer.class);
+            recordHeaderKeySizeOpt = parser.accepts("record-header-key-size", 
"Optional: The size of the message header key in bytes. Used together with 
record-header-size.")
+                    .withOptionalArg()
+                    .describedAs("bytes")
+                    .ofType(Integer.class);
+            recordHeaderValueSizeOpt = parser.accepts("record-header-size", 
"Optional: The size of message header value in bytes.")
+                    .withOptionalArg()
+                    .describedAs("bytes")
+                    .ofType(Integer.class);
+            numHeadersOpt = parser.accepts("num-headers", "Optional: The 
number of headers to include in each message.")
+                    .withOptionalArg()
+                    .describedAs("count")
+                    .ofType(Integer.class)
+                    .defaultsTo(1);
+            commandConfigOpt = parser.accepts("command-config", "Optional: A 
property file for Kafka producer/consumer/admin client configuration.")
+                    .withOptionalArg()
+                    .describedAs("config-file")
+                    .ofType(String.class);
+
+            try {
+                options = parser.parse(args);
+            } catch (OptionException e) {
+                CommandLineUtils.printUsageAndExit(parser, e.getMessage());
+            }
+            checkArgs();
+        }
+
+        void checkArgs() {
+            CommandLineUtils.maybePrintHelpOrVersion(this, "This tool measures 
end-to-end latency in Kafka by sending messages and timing their reception.");
+
+            // check required arguments
+            CommandLineUtils.checkRequiredArgs(parser, options, 
bootstrapServerOpt, topicOpt, numRecordsOpt, acksOpt, recordSizeOpt);
+
+            // validate 'producer-acks'
+            String acksValue = options.valueOf(acksOpt);
+            if (!List.of("1", "all").contains(acksValue)) {

Review Comment:
   The legacy version only had these two options, so I keep it the same. Since 
`-1` has the same effect as `all`, I think one is enough?



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