[GitHub] [kafka] ijuma commented on a diff in pull request #13095: KAFKA-14580: Moving EndToEndLatency from core to tools module

[GitBox <gi...@apache.org>]

ijuma commented on code in PR #13095:
URL: https://github.com/apache/kafka/pull/13095#discussion_r1071369472


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tools/src/main/java/org/apache/kafka/tools/EndToEndLatency.java:
##########
@@ -0,0 +1,237 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.kafka.tools;
+
+import org.apache.kafka.clients.admin.Admin;
+import org.apache.kafka.clients.admin.NewTopic;
+import org.apache.kafka.clients.consumer.ConsumerConfig;
+import org.apache.kafka.clients.consumer.ConsumerRecords;
+import org.apache.kafka.clients.consumer.KafkaConsumer;
+import org.apache.kafka.clients.producer.KafkaProducer;
+import org.apache.kafka.clients.producer.ProducerConfig;
+import org.apache.kafka.clients.producer.ProducerRecord;
+import org.apache.kafka.common.TopicPartition;
+import org.apache.kafka.common.utils.Exit;
+import org.apache.kafka.common.utils.Utils;
+
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.time.Duration;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Properties;
+import java.util.List;
+import java.util.Random;
+import java.util.concurrent.ExecutionException;
+import java.util.stream.Collectors;
+
+/**
+ * This class records the average end to end latency for a single message to travel through Kafka
+ *
+ * broker_list = location of the bootstrap broker for both the producer and the consumer
+ * num_messages = # messages to send
+ * producer_acks = See ProducerConfig.ACKS_DOC
+ * message_size_bytes = size of each message in bytes
+ *
+ * e.g. [localhost:9092 test 10000 1 20]
+ */
+public class EndToEndLatency {
+
+    private final static long POLL_TIMEOUT_MS = 60000;
+
+    public static void main(String... args) {
+        Exit.exit(mainNoExit(args));
+    }
+
+    static int mainNoExit(String... args) {
+        try {
+            if (args.length != 5 && args.length != 6) {
+                System.err.println("USAGE: java " + EndToEndLatency.class.getName()
+                        + " broker_list topic num_messages producer_acks message_size_bytes [optional] properties_file");
+                return 1;
+            }
+            execute(args);
+            return 0;
+        } catch (TerseException e) {
+            System.err.println(e.getMessage());
+            return 1;
+        } catch (Throwable e) {
+            System.err.println(e.getMessage());
+            System.err.println(Utils.stackTrace(e));
+            return 1;
+        }
+    }
+
+    // Visible for testing
+    static void execute(String... args) throws Exception {
+        String brokers = args[0];
+        String topic = args[1];
+        int numMessages = Integer.parseInt(args[2]);
+        String acks = args[3];
+        int messageSizeBytes = Integer.parseInt(args[4]);
+        String propertiesFile = args.length > 5 ? args[5] : null;
+
+        if (!Arrays.asList("1", "all").contains(acks)) {
+            throw new IllegalArgumentException("Latency testing requires synchronous acknowledgement. Please use 1 or all");
+        }
+
+        Properties props;
+        try {
+            props = loadPropsWithBootstrapServers(propertiesFile);
+        } catch (FileNotFoundException e) {
+            throw new IllegalArgumentException("Properties file not found");
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+
+        try (KafkaConsumer<byte[], byte[]> consumer = createKafkaConsumer(props, brokers);
+             KafkaProducer<byte[], byte[]> producer = createKafkaProducer(props, acks, brokers)) {
+
+            if (!consumer.listTopics().containsKey(topic)) {
+                createTopic(props, topic);
+            }
+
+            setupConsumer(topic, consumer);
+
+            double totalTime = 0.0;
+            long[] latencies = new long[numMessages];
+            Random random = new Random(0);
+
+            for (int i = 0; i < numMessages; i++) {
+                byte[] message = randomBytesOfLen(random, messageSizeBytes);
+                long begin = System.nanoTime();
+                //Send message (of random bytes) synchronously then immediately poll for it
+                producer.send(new ProducerRecord<>(topic, message)).get();
+                ConsumerRecords<byte[], byte[]> records = consumer.poll(Duration.ofMillis(POLL_TIMEOUT_MS));

Review Comment:
   I don't think we need to keep the original code when it's strictly worse.



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