From: Kai Moritz Date: Sun, 24 Jul 2022 10:34:53 +0000 (+0200) Subject: Merge der Refaktorisierung des EndlessConsumer (Branch 'deserialization') X-Git-Tag: wip-DEPRECATED~11^2 X-Git-Url: http://juplo.de/gitweb/?a=commitdiff_plain;h=83a4bf324f5a7ec6010a7921118ec7d6e8f997cf;p=demos%2Fkafka%2Ftraining Merge der Refaktorisierung des EndlessConsumer (Branch 'deserialization') * Um die Implementierung besser testen zu können, wurde die Anwendung in dem Branch 'deserialization' refaktorisiert. * Diese Refaktorisierung werden hier zusammen mit den eingeführten Tests gemerged. * Der so verfügbar gemachte Test wurde so angepasst, dass er das Speichern des Zustands in einer MongoDB berücksichtigt. --- 83a4bf324f5a7ec6010a7921118ec7d6e8f997cf diff --cc docker-compose.yml index e30a7bb,159f9cb..30ae3b4 --- a/docker-compose.yml +++ b/docker-compose.yml @@@ -24,30 -24,13 +24,30 @@@ services depends_on: - zookeeper - setup: - image: juplo/toolbox - command: > - bash -c " - kafka-topics --bootstrap-server kafka:9092 --delete --if-exists --topic test - kafka-topics --bootstrap-server kafka:9092 --create --topic test --partitions 2 - " + mongo: - image: mongo:4.4 ++ image: mongo:4.4.13 + ports: + - 27017:27017 + environment: + MONGO_INITDB_ROOT_USERNAME: juplo + MONGO_INITDB_ROOT_PASSWORD: training + + express: + image: mongo-express + ports: + - 8090:8081 + environment: + ME_CONFIG_MONGODB_ADMINUSERNAME: juplo + ME_CONFIG_MONGODB_ADMINPASSWORD: training + ME_CONFIG_MONGODB_URL: mongodb://juplo:training@mongo:27017/ + + kafka-ui: + image: provectuslabs/kafka-ui:0.3.3 + ports: + - 8080:8080 + environment: + KAFKA_CLUSTERS_0_NAME: local + KAFKA_CLUSTERS_0_BOOTSTRAPSERVERS: kafka:9092 cli: image: juplo/toolbox diff --cc pom.xml index 0fbe7e6,1f5caab..701704d --- a/pom.xml +++ b/pom.xml @@@ -51,6 -47,16 +51,21 @@@ spring-boot-starter-test test + + org.springframework.kafka + spring-kafka-test + test + + + org.awaitility + awaitility + test + ++ ++ de.flapdoodle.embed ++ de.flapdoodle.embed.mongo ++ test ++ diff --cc src/main/java/de/juplo/kafka/Application.java index 2f6e4f2,b5bd1b9..d280aa6 --- a/src/main/java/de/juplo/kafka/Application.java +++ b/src/main/java/de/juplo/kafka/Application.java @@@ -1,12 -1,16 +1,15 @@@ package de.juplo.kafka; + import lombok.extern.slf4j.Slf4j; import org.springframework.beans.factory.annotation.Autowired; + import org.springframework.boot.ApplicationArguments; + import org.springframework.boot.ApplicationRunner; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; - import org.springframework.boot.context.properties.EnableConfigurationProperties; - import org.springframework.context.annotation.Bean; - import java.util.concurrent.Executors; + import javax.annotation.PreDestroy; -import java.util.List; + import java.util.concurrent.ExecutorService; + import java.util.concurrent.TimeUnit; @SpringBootApplication diff --cc src/main/java/de/juplo/kafka/ApplicationConfiguration.java index 0000000,4054e93..1ba9d5b mode 000000,100644..100644 --- a/src/main/java/de/juplo/kafka/ApplicationConfiguration.java +++ b/src/main/java/de/juplo/kafka/ApplicationConfiguration.java @@@ -1,0 -1,67 +1,69 @@@ + package de.juplo.kafka; + + import org.apache.kafka.clients.consumer.ConsumerRecord; + import org.apache.kafka.clients.consumer.KafkaConsumer; + import org.apache.kafka.common.serialization.LongDeserializer; + import org.apache.kafka.common.serialization.StringDeserializer; + import org.springframework.boot.context.properties.EnableConfigurationProperties; + import org.springframework.context.annotation.Bean; + import org.springframework.context.annotation.Configuration; + + import java.util.Properties; + import java.util.concurrent.ExecutorService; + import java.util.concurrent.Executors; + import java.util.function.Consumer; + + + @Configuration + @EnableConfigurationProperties(ApplicationProperties.class) + public class ApplicationConfiguration + { + @Bean + public Consumer> consumer() + { + return (record) -> + { + // Handle record + }; + } + + @Bean + public EndlessConsumer endlessConsumer( + KafkaConsumer kafkaConsumer, + ExecutorService executor, + Consumer> handler, ++ PartitionStatisticsRepository repository, + ApplicationProperties properties) + { + return + new EndlessConsumer<>( + executor, ++ repository, + properties.getClientId(), + properties.getTopic(), + kafkaConsumer, + handler); + } + + @Bean + public ExecutorService executor() + { + return Executors.newSingleThreadExecutor(); + } + + @Bean(destroyMethod = "close") + public KafkaConsumer kafkaConsumer(ApplicationProperties properties) + { + Properties props = new Properties(); + + props.put("bootstrap.servers", properties.getBootstrapServer()); + props.put("group.id", properties.getGroupId()); + props.put("client.id", properties.getClientId()); + props.put("auto.offset.reset", properties.getAutoOffsetReset()); + props.put("metadata.max.age.ms", "1000"); + props.put("key.deserializer", StringDeserializer.class.getName()); + props.put("value.deserializer", LongDeserializer.class.getName()); + + return new KafkaConsumer<>(props); + } + } diff --cc src/main/java/de/juplo/kafka/EndlessConsumer.java index e5ef7d0,8802df9..a21dd86 --- a/src/main/java/de/juplo/kafka/EndlessConsumer.java +++ b/src/main/java/de/juplo/kafka/EndlessConsumer.java @@@ -20,45 -18,67 +18,74 @@@ import java.util.concurrent.locks.Reent @Slf4j - public class EndlessConsumer implements Runnable + @RequiredArgsConstructor + public class EndlessConsumer implements ConsumerRebalanceListener, Runnable { private final ExecutorService executor; + private final PartitionStatisticsRepository repository; - private final String bootstrapServer; - private final String groupId; private final String id; private final String topic; - private final String autoOffsetReset; + private final Consumer consumer; + private final java.util.function.Consumer> handler; private final Lock lock = new ReentrantLock(); private final Condition condition = lock.newCondition(); private boolean running = false; private Exception exception; private long consumed = 0; - private KafkaConsumer consumer = null; + private final Map> seen = new HashMap<>(); + private final Map offsets = new HashMap<>(); - private final Map> seen = new HashMap<>(); + @Override + public void onPartitionsRevoked(Collection partitions) + { + partitions.forEach(tp -> + { + Integer partition = tp.partition(); + Long newOffset = consumer.position(tp); + Long oldOffset = offsets.remove(partition); + log.info( + "{} - removing partition: {}, consumed {} records (offset {} -> {})", + id, + partition, + newOffset - oldOffset, + oldOffset, + newOffset); + Map removed = seen.remove(partition); + for (String key : removed.keySet()) + { + log.info( + "{} - Seen {} messages for partition={}|key={}", + id, + removed.get(key), + partition, + key); + } ++ repository.save(new StatisticsDocument(partition, removed)); + }); + } - public EndlessConsumer( - ExecutorService executor, - PartitionStatisticsRepository repository, - String bootstrapServer, - String groupId, - String clientId, - String topic, - String autoOffsetReset) + @Override + public void onPartitionsAssigned(Collection partitions) { - this.executor = executor; - this.repository = repository; - this.bootstrapServer = bootstrapServer; - this.groupId = groupId; - this.id = clientId; - this.topic = topic; - this.autoOffsetReset = autoOffsetReset; + partitions.forEach(tp -> + { + Integer partition = tp.partition(); + Long offset = consumer.position(tp); + log.info("{} - adding partition: {}, offset={}", id, partition, offset); + offsets.put(partition, offset); - seen.put(partition, new HashMap<>()); ++ seen.put( ++ partition, ++ repository ++ .findById(Integer.toString(tp.partition())) ++ .map(document -> document.statistics) ++ .orElse(new HashMap<>())); + }); } + @Override public void run() { diff --cc src/main/java/de/juplo/kafka/StatisticsDocument.java index be998ca,0000000..2416253 mode 100644,000000..100644 --- a/src/main/java/de/juplo/kafka/StatisticsDocument.java +++ b/src/main/java/de/juplo/kafka/StatisticsDocument.java @@@ -1,28 -1,0 +1,28 @@@ +package de.juplo.kafka; + +import lombok.ToString; +import org.springframework.data.annotation.Id; +import org.springframework.data.mongodb.core.mapping.Document; + +import java.util.HashMap; +import java.util.Map; + + +@Document(collection = "statistics") +@ToString +public class StatisticsDocument +{ + @Id + public String id; - public Map statistics; ++ public Map statistics; + + public StatisticsDocument() + { + } + - public StatisticsDocument(Integer partition, Map statistics) ++ public StatisticsDocument(Integer partition, Map statistics) + { + this.id = Integer.toString(partition); + this.statistics = statistics; + } +} diff --cc src/test/java/de/juplo/kafka/ApplicationTests.java index 0000000,40dc149..caa25c5 mode 000000,100644..100644 --- a/src/test/java/de/juplo/kafka/ApplicationTests.java +++ b/src/test/java/de/juplo/kafka/ApplicationTests.java @@@ -1,0 -1,315 +1,323 @@@ + package de.juplo.kafka; + + import lombok.extern.slf4j.Slf4j; + import org.apache.kafka.clients.consumer.ConsumerRecord; + import org.apache.kafka.clients.consumer.KafkaConsumer; + import org.apache.kafka.clients.producer.KafkaProducer; + import org.apache.kafka.clients.producer.ProducerRecord; + import org.apache.kafka.common.TopicPartition; + import org.apache.kafka.common.errors.RecordDeserializationException; + import org.apache.kafka.common.serialization.*; + import org.apache.kafka.common.utils.Bytes; + import org.junit.jupiter.api.*; + import org.springframework.beans.factory.annotation.Autowired; ++import org.springframework.boot.autoconfigure.EnableAutoConfiguration; ++import org.springframework.boot.test.autoconfigure.data.mongo.AutoConfigureDataMongo; + import org.springframework.boot.test.context.ConfigDataApplicationContextInitializer; + import org.springframework.boot.test.context.TestConfiguration; + import org.springframework.context.annotation.Bean; + import org.springframework.context.annotation.Import; + import org.springframework.kafka.test.context.EmbeddedKafka; + import org.springframework.test.context.TestPropertySource; + import org.springframework.test.context.junit.jupiter.SpringJUnitConfig; + + import java.time.Duration; + import java.util.*; + import java.util.concurrent.ExecutionException; + import java.util.concurrent.ExecutorService; + import java.util.function.BiConsumer; + import java.util.function.Consumer; + import java.util.function.Function; + import java.util.stream.Collectors; + import java.util.stream.IntStream; + + import static de.juplo.kafka.ApplicationTests.PARTITIONS; + import static de.juplo.kafka.ApplicationTests.TOPIC; + import static org.assertj.core.api.Assertions.*; + import static org.awaitility.Awaitility.*; + + + @SpringJUnitConfig(initializers = ConfigDataApplicationContextInitializer.class) + @TestMethodOrder(MethodOrderer.OrderAnnotation.class) + @TestPropertySource( + properties = { + "consumer.bootstrap-server=${spring.embedded.kafka.brokers}", - "consumer.topic=" + TOPIC }) ++ "consumer.topic=" + TOPIC, ++ "spring.mongodb.embedded.version=4.4.13" }) + @EmbeddedKafka(topics = TOPIC, partitions = PARTITIONS) ++@EnableAutoConfiguration ++@AutoConfigureDataMongo + @Slf4j + class ApplicationTests + { + public static final String TOPIC = "FOO"; + public static final int PARTITIONS = 10; + + + StringSerializer stringSerializer = new StringSerializer(); + + @Autowired + Serializer valueSerializer; + @Autowired + KafkaProducer kafkaProducer; + @Autowired + KafkaConsumer kafkaConsumer; + @Autowired + KafkaConsumer offsetConsumer; + @Autowired + ApplicationProperties properties; + @Autowired + ExecutorService executor; ++ @Autowired ++ PartitionStatisticsRepository repository; + + Consumer> testHandler; + EndlessConsumer endlessConsumer; + Map oldOffsets; + Map newOffsets; + Set> receivedRecords; + + + /** Tests methods */ + + @Test + @Order(1) // << The poistion pill is not skipped. Hence, this test must run first + void commitsCurrentOffsetsOnSuccess() throws ExecutionException, InterruptedException + { + send100Messages(i -> new Bytes(valueSerializer.serialize(TOPIC, i))); + + await("100 records received") + .atMost(Duration.ofSeconds(30)) + .until(() -> receivedRecords.size() >= 100); + + await("Offsets committed") + .atMost(Duration.ofSeconds(10)) + .untilAsserted(() -> + { + checkSeenOffsetsForProgress(); + compareToCommitedOffsets(newOffsets); + }); + + assertThatExceptionOfType(IllegalStateException.class) + .isThrownBy(() -> endlessConsumer.exitStatus()) + .describedAs("Consumer should still be running"); + } + + @Test + @Order(2) + void commitsOffsetOfErrorForReprocessingOnError() + { + send100Messages(counter -> + counter == 77 + ? new Bytes(stringSerializer.serialize(TOPIC, "BOOM!")) + : new Bytes(valueSerializer.serialize(TOPIC, counter))); + + await("Consumer failed") + .atMost(Duration.ofSeconds(30)) + .until(() -> !endlessConsumer.running()); + + checkSeenOffsetsForProgress(); + compareToCommitedOffsets(newOffsets); + + endlessConsumer.start(); + await("Consumer failed") + .atMost(Duration.ofSeconds(30)) + .until(() -> !endlessConsumer.running()); + + checkSeenOffsetsForProgress(); + compareToCommitedOffsets(newOffsets); + assertThat(receivedRecords.size()) + .describedAs("Received not all sent events") + .isLessThan(100); + + assertThatNoException() + .describedAs("Consumer should not be running") + .isThrownBy(() -> endlessConsumer.exitStatus()); + assertThat(endlessConsumer.exitStatus()) + .describedAs("Consumer should have exited abnormally") + .containsInstanceOf(RecordDeserializationException.class); + } + + + /** Helper methods for the verification of expectations */ + + void compareToCommitedOffsets(Map offsetsToCheck) + { + doForCurrentOffsets((tp, offset) -> + { + Long expected = offsetsToCheck.get(tp) + 1; + log.debug("Checking, if the offset for {} is {}", tp, expected); + assertThat(offset) + .describedAs("Committed offset corresponds to the offset of the consumer") + .isEqualTo(expected); + }); + } + + void checkSeenOffsetsForProgress() + { + // Be sure, that some messages were consumed...! + Set withProgress = new HashSet<>(); + partitions().forEach(tp -> + { + Long oldOffset = oldOffsets.get(tp); + Long newOffset = newOffsets.get(tp); + if (!oldOffset.equals(newOffset)) + { + log.debug("Progress for {}: {} -> {}", tp, oldOffset, newOffset); + withProgress.add(tp); + } + }); + assertThat(withProgress) + .describedAs("Some offsets must have changed, compared to the old offset-positions") + .isNotEmpty(); + } + + + /** Helper methods for setting up and running the tests */ + + void doForCurrentOffsets(BiConsumer consumer) + { + offsetConsumer.assign(partitions()); + partitions().forEach(tp -> consumer.accept(tp, offsetConsumer.position(tp))); + offsetConsumer.unsubscribe(); + } + + List partitions() + { + return + IntStream + .range(0, PARTITIONS) + .mapToObj(partition -> new TopicPartition(TOPIC, partition)) + .collect(Collectors.toList()); + } + + + void send100Messages(Function messageGenerator) + { + long i = 0; + + for (int partition = 0; partition < 10; partition++) + { + for (int key = 0; key < 10; key++) + { + Bytes value = messageGenerator.apply(++i); + + ProducerRecord record = + new ProducerRecord<>( + TOPIC, + partition, + Integer.toString(key%2), + value); + + kafkaProducer.send(record, (metadata, e) -> + { + if (metadata != null) + { + log.debug( + "{}|{} - {}={}", + metadata.partition(), + metadata.offset(), + record.key(), + record.value()); + } + else + { + log.warn( + "Exception for {}={}: {}", + record.key(), + record.value(), + e.toString()); + } + }); + } + } + } + + + @BeforeEach + public void init() + { + testHandler = record -> {} ; + + oldOffsets = new HashMap<>(); + newOffsets = new HashMap<>(); + receivedRecords = new HashSet<>(); + + doForCurrentOffsets((tp, offset) -> + { + oldOffsets.put(tp, offset - 1); + newOffsets.put(tp, offset - 1); + }); + + Consumer> captureOffsetAndExecuteTestHandler = + record -> + { + newOffsets.put( + new TopicPartition(record.topic(), record.partition()), + record.offset()); + receivedRecords.add(record); + testHandler.accept(record); + }; + + endlessConsumer = + new EndlessConsumer<>( + executor, ++ repository, + properties.getClientId(), + properties.getTopic(), + kafkaConsumer, + captureOffsetAndExecuteTestHandler); + + endlessConsumer.start(); + } + + @AfterEach + public void deinit() + { + try + { + endlessConsumer.stop(); + } + catch (Exception e) + { + log.info("Exception while stopping the consumer: {}", e.toString()); + } + } + + + @TestConfiguration + @Import(ApplicationConfiguration.class) + public static class Configuration + { + @Bean + Serializer serializer() + { + return new LongSerializer(); + } + + @Bean + KafkaProducer kafkaProducer(ApplicationProperties properties) + { + Properties props = new Properties(); + props.put("bootstrap.servers", properties.getBootstrapServer()); + props.put("linger.ms", 100); + props.put("key.serializer", StringSerializer.class.getName()); + props.put("value.serializer", BytesSerializer.class.getName()); + + return new KafkaProducer<>(props); + } + + @Bean + KafkaConsumer offsetConsumer(ApplicationProperties properties) + { + Properties props = new Properties(); + props.put("bootstrap.servers", properties.getBootstrapServer()); + props.put("client.id", "OFFSET-CONSUMER"); + props.put("group.id", properties.getGroupId()); + props.put("key.deserializer", BytesDeserializer.class.getName()); + props.put("value.deserializer", BytesDeserializer.class.getName()); + + return new KafkaConsumer<>(props); + } + } + }