ME_CONFIG_MONGODB_ADMINUSERNAME: juplo
ME_CONFIG_MONGODB_ADMINPASSWORD: training
ME_CONFIG_MONGODB_URL: mongodb://juplo:training@mongo:27017/
+ depends_on:
+ - mongo
- 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
- "
+ 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
package de.juplo.kafka;
- import org.apache.kafka.clients.consumer.ConsumerRecord;
-import org.apache.kafka.clients.consumer.Consumer;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.common.serialization.LongDeserializer;
import org.apache.kafka.common.serialization.StringDeserializer;
public class ApplicationConfiguration
{
@Bean
- public Consumer<ConsumerRecord<String, Long>> consumer()
- public KeyCountingRecordHandler messageCountingRecordHandler()
++ public KeyCountingRecordHandler keyCountingRecordHandler()
{
- return (record) ->
- {
- // Handle record
- };
+ return new KeyCountingRecordHandler();
+ }
+
+ @Bean
- public KeyCountingRebalanceListener wordcountRebalanceListener(
++ public KeyCountingRebalanceListener keyCountingRebalanceListener(
+ KeyCountingRecordHandler keyCountingRecordHandler,
+ PartitionStatisticsRepository repository,
- Consumer<String, Long> consumer,
+ ApplicationProperties properties)
+ {
+ return new KeyCountingRebalanceListener(
+ keyCountingRecordHandler,
+ repository,
+ properties.getClientId(),
- properties.getTopic(),
+ Clock.systemDefaultZone(),
- properties.getCommitInterval(),
- consumer);
++ properties.getCommitInterval());
}
@Bean
Properties props = new Properties();
props.put("bootstrap.servers", properties.getBootstrapServer());
+ props.put("partition.assignment.strategy", "org.apache.kafka.clients.consumer.CooperativeStickyAssignor");
props.put("group.id", properties.getGroupId());
props.put("client.id", properties.getClientId());
- props.put("enable.auto.commit", false);
props.put("auto.offset.reset", properties.getAutoOffsetReset());
+ props.put("auto.commit.interval.ms", (int)properties.getCommitInterval().toMillis());
props.put("metadata.max.age.ms", "1000");
props.put("key.deserializer", StringDeserializer.class.getName());
props.put("value.deserializer", LongDeserializer.class.getName());
--- /dev/null
-import org.apache.kafka.clients.consumer.Consumer;
+ package de.juplo.kafka;
+
+ import lombok.RequiredArgsConstructor;
+ import lombok.extern.slf4j.Slf4j;
- private final String topic;
+ import org.apache.kafka.common.TopicPartition;
+
+ import java.time.Clock;
+ import java.time.Duration;
+ import java.time.Instant;
+ import java.util.Collection;
+ import java.util.Map;
+
+
+ @RequiredArgsConstructor
+ @Slf4j
+ public class KeyCountingRebalanceListener implements PollIntervalAwareConsumerRebalanceListener
+ {
+ private final KeyCountingRecordHandler handler;
+ private final PartitionStatisticsRepository repository;
+ private final String id;
- private final Consumer<String, Long> consumer;
+ private final Clock clock;
+ private final Duration commitInterval;
- Long offset = consumer.position(tp);
- log.info("{} - adding partition: {}, offset={}", id, partition, offset);
+
+ private Instant lastCommit = Instant.EPOCH;
+
+ @Override
+ public void onPartitionsAssigned(Collection<TopicPartition> partitions)
+ {
+ partitions.forEach(tp ->
+ {
+ Integer partition = tp.partition();
- if (document.offset >= 0)
- {
- // Only seek, if a stored offset was found
- // Otherwise: Use initial offset, generated by Kafka
- consumer.seek(tp, document.offset);
- }
++ log.info("{} - adding partition: {}", id, partition);
+ StatisticsDocument document =
+ repository
+ .findById(Integer.toString(partition))
+ .orElse(new StatisticsDocument(partition));
- Long newOffset = consumer.position(tp);
- log.info(
- "{} - removing partition: {}, offset of next message {})",
- id,
- partition,
- newOffset);
+ handler.addPartition(partition, document.statistics);
+ });
+ }
+
+ @Override
+ public void onPartitionsRevoked(Collection<TopicPartition> partitions)
+ {
+ partitions.forEach(tp ->
+ {
+ Integer partition = tp.partition();
- repository.save(new StatisticsDocument(partition, removed, consumer.position(tp)));
++ log.info("{} - removing partition: {}", id, partition);
+ Map<String, Long> removed = handler.removePartition(partition);
- log.debug("Storing data and offsets, last commit: {}", lastCommit);
++ for (String key : removed.keySet())
++ {
++ log.info(
++ "{} - Seen {} messages for partition={}|key={}",
++ id,
++ removed.get(key),
++ partition,
++ key);
++ }
++ repository.save(new StatisticsDocument(partition, removed));
+ });
+ }
+
+
+ @Override
+ public void beforeNextPoll()
+ {
+ if (lastCommit.plus(commitInterval).isBefore(clock.instant()))
+ {
- statistics,
- consumer.position(new TopicPartition(topic, partiton)))));
++ log.debug("Storing data, last commit: {}", lastCommit);
+ handler.getSeen().forEach((partiton, statistics) -> repository.save(
+ new StatisticsDocument(
+ partiton,
++ statistics)));
+ lastCommit = clock.instant();
+ }
+ }
+ }
{
}
- public StatisticsDocument(Integer partition, Map<String, Long> statistics, long offset)
+ public StatisticsDocument(Integer partition)
+ {
+ this.id = Integer.toString(partition);
+ this.statistics = new HashMap<>();
+ }
+
+ public StatisticsDocument(Integer partition, Map<String, Long> statistics)
{
this.id = Integer.toString(partition);
this.statistics = statistics;
--- /dev/null
- public void testApplicationStartup()
+ package de.juplo.kafka;
+
+ import org.junit.jupiter.api.Test;
+ import org.springframework.beans.factory.annotation.Autowired;
+ import org.springframework.boot.test.autoconfigure.data.mongo.AutoConfigureDataMongo;
+ import org.springframework.boot.test.context.SpringBootTest;
+ import org.springframework.boot.test.web.client.TestRestTemplate;
+ import org.springframework.boot.test.web.server.LocalServerPort;
+ import org.springframework.kafka.test.context.EmbeddedKafka;
+
+ import static de.juplo.kafka.ApplicationTests.TOPIC;
+
+
+ @SpringBootTest(
+ webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT,
+ properties = {
+ "consumer.bootstrap-server=${spring.embedded.kafka.brokers}",
+ "consumer.topic=" + TOPIC,
+ "spring.mongodb.embedded.version=4.4.13" })
+ @EmbeddedKafka(topics = TOPIC)
+ @AutoConfigureDataMongo
+ public class ApplicationIT
+ {
+ public static final String TOPIC = "FOO";
+
+ @LocalServerPort
+ private int port;
+
+ @Autowired
+ private TestRestTemplate restTemplate;
+
+
+
+ @Test
++ public void testApplicationStartup()
+ {
+ restTemplate.getForObject(
+ "http://localhost:" + port + "/actuator/health",
+ String.class
+ )
+ .contains("UP");
+ }
+ }
@Autowired
ExecutorService executor;
@Autowired
-- PartitionStatisticsRepository repository;
- @Autowired
+ KeyCountingRebalanceListener keyCountingRebalanceListener;
+ @Autowired
+ KeyCountingRecordHandler keyCountingRecordHandler;
- Consumer<ConsumerRecord<String, Long>> testHandler;
EndlessConsumer<String, Long> endlessConsumer;
Map<TopicPartition, Long> oldOffsets;
Map<TopicPartition, Long> newOffsets;
/** Helper methods for setting up and running the tests */
- Integer partition = tp.partition();
- StatisticsDocument document =
- partitionStatisticsRepository
- .findById(partition.toString())
- .orElse(new StatisticsDocument(partition));
- document.offset = offset;
- partitionStatisticsRepository.save(document);
+ void seekToEnd()
+ {
+ offsetConsumer.assign(partitions());
++ offsetConsumer.seekToEnd(partitions());
+ partitions().forEach(tp ->
+ {
++ // seekToEnd() works lazily: it only takes effect on poll()/position()
+ Long offset = offsetConsumer.position(tp);
+ log.info("New position for {}: {}", tp, offset);
+ });
++ // The new positions must be commited!
++ offsetConsumer.commitSync();
+ offsetConsumer.unsubscribe();
+ }
+
void doForCurrentOffsets(BiConsumer<TopicPartition, Long> consumer)
{
- partitions().forEach(tp ->
- {
- String partition = Integer.toString(tp.partition());
- Optional<Long> offset = partitionStatisticsRepository.findById(partition).map(document -> document.offset);
- consumer.accept(tp, offset.orElse(0l));
- });
- }
+ offsetConsumer.assign(partitions());
+ partitions().forEach(tp -> consumer.accept(tp, offsetConsumer.position(tp)));
+ offsetConsumer.unsubscribe();
+ }
List<TopicPartition> partitions()
{
projects / demos / kafka / training / commitdiff