vamossagar12 commented on code in PR #13095: URL: https://github.com/apache/kafka/pull/13095#discussion_r1088161412
########## tools/src/main/java/org/apache/kafka/tools/EndToEndLatency.java: ########## @@ -0,0 +1,225 @@ +/* + * 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.CommonClientConfigs; +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.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.Optional; +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 { + 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 { + if (args.length != 5 && args.length != 6) { + throw new TerseException("USAGE: java " + EndToEndLatency.class.getName() + + " broker_list topic num_messages producer_acks message_size_bytes [optional] properties_file"); + } + + String brokers = args[0]; + String topic = args[1]; + int numMessages = Integer.parseInt(args[2]); + String acks = args[3]; + int messageSizeBytes = Integer.parseInt(args[4]); + Optional<String> propertiesFile = args.length > 5 ? (Utils.isBlank(args[5]) ? Optional.empty() : Optional.of(args[5])) : Optional.empty(); + + if (!Arrays.asList("1", "all").contains(acks)) { + throw new IllegalArgumentException("Latency testing requires synchronous acknowledgement. Please use 1 or all"); + } + + try (KafkaConsumer<byte[], byte[]> consumer = createKafkaConsumer(propertiesFile, brokers); + KafkaProducer<byte[], byte[]> producer = createKafkaProducer(propertiesFile, brokers, acks)) { + + if (!consumer.listTopics().containsKey(topic)) { + createTopic(propertiesFile, brokers, 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)); + long elapsed = System.nanoTime() - begin; + + validate(consumer, message, records); + + //Report progress + if (i % 1000 == 0) + System.out.println(i + "\t" + elapsed / 1000.0 / 1000.0); + totalTime += elapsed; + latencies[i] = elapsed / 1000 / 1000; + } + + printResults(numMessages, totalTime, latencies); + consumer.commitSync(); + } + } + + // Visible for testing + static void validate(KafkaConsumer<byte[], byte[]> consumer, byte[] message, ConsumerRecords<byte[], byte[]> records) { + if (records.isEmpty()) { + consumer.commitSync(); + throw new RuntimeException("poll() timed out before finding a result (timeout:[" + POLL_TIMEOUT_MS + "])"); + } + + //Check result matches the original record + String sent = new String(message, StandardCharsets.UTF_8); + String read = new String(records.iterator().next().value(), StandardCharsets.UTF_8); + + if (!read.equals(sent)) { + consumer.commitSync(); + throw new RuntimeException("The message read [" + read + "] did not match the message sent [" + sent + "]"); + } + + //Check we only got the one message + if (records.count() != 1) { + int count = records.count(); + consumer.commitSync(); + throw new RuntimeException("Only one result was expected during this test. We found [" + count + "]"); + } + } + + private static void setupConsumer(String topic, KafkaConsumer<byte[], byte[]> consumer) { + List<TopicPartition> topicPartitions = consumer. + partitionsFor(topic). + stream().map(p -> new TopicPartition(p.topic(), p.partition())) + .collect(Collectors.toList()); + consumer.assign(topicPartitions); + consumer.seekToEnd(topicPartitions); + consumer.assignment().forEach(consumer::position); + } + + private static void printResults(int numMessages, double totalTime, long[] latencies) { + System.out.printf("Avg latency: %.4f ms%n", totalTime / numMessages / 1000.0 / 1000.0); + Arrays.sort(latencies); + int p50 = (int) latencies[(int) (latencies.length * 0.5)]; + int p99 = (int) latencies[(int) (latencies.length * 0.99)]; + int p999 = (int) latencies[(int) (latencies.length * 0.999)]; + System.out.printf("Percentiles: 50th = %d, 99th = %d, 99.9th = %d%n", p50, p99, p999); + } + + private static byte[] randomBytesOfLen(Random random, int length) { + byte[] randomBytes = new byte[length]; + Arrays.fill(randomBytes, Integer.valueOf(random.nextInt(26) + 65).byteValue()); + return randomBytes; + } + + private static void createTopic(Optional<String> propertiesFile, String brokers, String topic) throws IOException { + short defaultReplicationFactor = 1; + int defaultNumPartitions = 1; Review Comment: done -- This is an automated message from the Apache Git Service. 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