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.test.context.TestPropertySource;
import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
-import java.time.Clock;
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;
properties = {
"consumer.bootstrap-server=${spring.embedded.kafka.brokers}",
"consumer.topic=" + TOPIC,
- "consumer.commit-interval=1s",
- "spring.mongodb.embedded.version=4.4.13" })
+ "consumer.commit-interval=1s" })
@EmbeddedKafka(topics = TOPIC, partitions = PARTITIONS)
@EnableAutoConfiguration
-@AutoConfigureDataMongo
@Slf4j
class ApplicationTests
{
@Autowired
KafkaProducer<String, Bytes> kafkaProducer;
@Autowired
- KafkaConsumer<String, String> kafkaConsumer;
+ KafkaConsumer<String, Long> kafkaConsumer;
@Autowired
- PartitionStatisticsRepository partitionStatisticsRepository;
+ KafkaConsumer<Bytes, Bytes> offsetConsumer;
@Autowired
ApplicationProperties properties;
@Autowired
ExecutorService executor;
@Autowired
- PartitionStatisticsRepository repository;
+ ApplicationRebalanceListener rebalanceListener;
+ @Autowired
+ ApplicationRecordHandler recordHandler;
- Consumer<ConsumerRecord<String, String>> testHandler;
- EndlessConsumer endlessConsumer;
+ EndlessConsumer<String, Long> endlessConsumer;
Map<TopicPartition, Long> oldOffsets;
Map<TopicPartition, Long> newOffsets;
- Set<ConsumerRecord<String, String>> receivedRecords;
+ Set<ConsumerRecord<String, Long>> receivedRecords;
/** Tests methods */
@Test
void commitsCurrentOffsetsOnSuccess() throws ExecutionException, InterruptedException
{
- send100Messages(i -> new Bytes(valueSerializer.serialize(TOPIC, i)));
+ send100Messages((partition, key, counter) ->
+ {
+ Bytes value = new Bytes(valueSerializer.serialize(TOPIC, counter));
+ return new ProducerRecord<>(TOPIC, partition, key, value);
+ });
await("100 records received")
.atMost(Duration.ofSeconds(30))
+ .pollInterval(Duration.ofSeconds(1))
.until(() -> receivedRecords.size() >= 100);
await("Offsets committed")
.atMost(Duration.ofSeconds(10))
+ .pollInterval(Duration.ofSeconds(1))
.untilAsserted(() ->
{
checkSeenOffsetsForProgress();
.describedAs("Consumer should still be running");
}
+ @Test
+ void commitsOffsetOfErrorForReprocessingOnDeserializationError()
+ {
+ send100Messages((partition, key, counter) ->
+ {
+ Bytes value = counter == 77
+ ? new Bytes(stringSerializer.serialize(TOPIC, "BOOM!"))
+ : new Bytes(valueSerializer.serialize(TOPIC, counter));
+ return new ProducerRecord<>(TOPIC, partition, key, value);
+ });
+
+ await("Consumer failed")
+ .atMost(Duration.ofSeconds(30))
+ .pollInterval(Duration.ofSeconds(1))
+ .until(() -> !endlessConsumer.running());
+
+ checkSeenOffsetsForProgress();
+ compareToCommitedOffsets(newOffsets);
+
+ endlessConsumer.start();
+ await("Consumer failed")
+ .atMost(Duration.ofSeconds(30))
+ .pollInterval(Duration.ofSeconds(1))
+ .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 */
Set<TopicPartition> withProgress = new HashSet<>();
partitions().forEach(tp ->
{
- Long oldOffset = oldOffsets.get(tp);
- Long newOffset = newOffsets.get(tp);
+ Long oldOffset = oldOffsets.get(tp) + 1;
+ Long newOffset = newOffsets.get(tp) + 1;
if (!oldOffset.equals(newOffset))
{
log.debug("Progress for {}: {} -> {}", tp, oldOffset, newOffset);
/** Helper methods for setting up and running the tests */
- void doForCurrentOffsets(BiConsumer<TopicPartition, Long> consumer)
+ void seekToEnd()
{
+ offsetConsumer.assign(partitions());
+ offsetConsumer.seekToEnd(partitions());
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));
+ // 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)
+ {
+ offsetConsumer.assign(partitions());
+ partitions().forEach(tp -> consumer.accept(tp, offsetConsumer.position(tp)));
+ offsetConsumer.unsubscribe();
}
List<TopicPartition> partitions()
}
- void send100Messages(Function<Long, Bytes> messageGenerator)
+ public interface RecordGenerator<K, V>
+ {
+ public ProducerRecord<String, Bytes> generate(int partition, String key, long counter);
+ }
+
+ void send100Messages(RecordGenerator recordGenerator)
{
long i = 0;
{
for (int key = 0; key < 10; key++)
{
- Bytes value = messageGenerator.apply(++i);
-
ProducerRecord<String, Bytes> record =
- new ProducerRecord<>(
- TOPIC,
- partition,
- Integer.toString(key%2),
- value);
+ recordGenerator.generate(partition, Integer.toString(partition*10+key%2), ++i);
kafkaProducer.send(record, (metadata, e) ->
{
@BeforeEach
public void init()
{
- testHandler = record -> {} ;
+ seekToEnd();
oldOffsets = new HashMap<>();
newOffsets = new HashMap<>();
newOffsets.put(tp, offset - 1);
});
- Consumer<ConsumerRecord<String, String>> captureOffsetAndExecuteTestHandler =
- record ->
- {
- newOffsets.put(
- new TopicPartition(record.topic(), record.partition()),
- record.offset());
- receivedRecords.add(record);
- testHandler.accept(record);
+ TestRecordHandler<String, Long> captureOffsetAndExecuteTestHandler =
+ new TestRecordHandler<String, Long>(recordHandler) {
+ @Override
+ public void onNewRecord(ConsumerRecord<String, Long> record)
+ {
+ newOffsets.put(
+ new TopicPartition(record.topic(), record.partition()),
+ record.offset());
+ receivedRecords.add(record);
+ }
};
endlessConsumer =
- new EndlessConsumer(
+ new EndlessConsumer<>(
executor,
- repository,
properties.getClientId(),
properties.getTopic(),
- Clock.systemDefaultZone(),
- properties.getCommitInterval(),
- kafkaConsumer);
+ kafkaConsumer,
+ rebalanceListener,
+ captureOffsetAndExecuteTestHandler);
endlessConsumer.start();
}
return new KafkaProducer<>(props);
}
+
+ @Bean
+ KafkaConsumer<Bytes, Bytes> 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);
+ }
}
}
projects / demos / kafka / training / blobdiff