CODEWITHSUNDEEP
javaapache-kafkaspring-kafka
user2550140
user2550140

Reputation: 441

How to acknowledge current offset in spring kafka for manual commit

I am using Spring Kafka first time and I am not able to use Acknowledgement.acknowledge() method for manual commit in my consumer code. please let me know if anything missing in my consumer configuration or listener code. or else is there other way to handle acknowledge offset based on condition. Here i'm looking solution like if the offset is not committed/ acknowledge manually, it should pick same message/offset by consumer.

Configuration

import java.util.HashMap;
import java.util.Map;

import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.common.serialization.StringDeserializer;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.kafka.annotation.EnableKafka;
import org.springframework.kafka.config.ConcurrentKafkaListenerContainerFactory;
import org.springframework.kafka.core.DefaultKafkaConsumerFactory;
import org.springframework.kafka.listener.AbstractMessageListenerContainer.AckMode;

@EnableKafka
@Configuration
public class ConsumerConfig {

    @Value(value = "${kafka.bootstrapAddress}")
    private String bootstrapAddress;

    @Value(value = "${kafka.groupId}")
    private String groupId;

    @Bean
    public ConcurrentKafkaListenerContainerFactory<String, String> containerFactory() {
        Map<String, Object> props = new HashMap<String, Object>();
        props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapAddress);
        props.put(ConsumerConfig.GROUP_ID_CONFIG, groupId);
        props.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, false);
        props.put(ConsumerConfig.AUTO_COMMIT_INTERVAL_MS_CONFIG, 100);
        props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG,
                StringDeserializer.class);
        props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,
                StringDeserializer.class);
        props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "latest");
        ConcurrentKafkaListenerContainerFactory<String, String> factory = new ConcurrentKafkaListenerContainerFactory<String, String>();
        factory.setConsumerFactory(new DefaultKafkaConsumerFactory<String, String>(
                props));
        factory.getContainerProperties().setAckMode(AckMode.MANUAL_IMMEDIATE);
        factory.getContainerProperties().setSyncCommits(true);
        return factory;
    }
}

Listener

private static int value = 1;

@KafkaListener(id = "baz", topics = "${message.topic.name}", containerFactory = "containerFactory")
public void listenPEN_RE(@Payload String message,
        @Header(KafkaHeaders.RECEIVED_PARTITION_ID) int partition,
        @Header(KafkaHeaders.OFFSET) int offsets,
        Acknowledgment acknowledgment) {

    if (value%2==0){
        acknowledgment.acknowledge();
    }
    value++;
}

Upvotes: 44

Views: 87483

Answers (5)

Boss Man
Boss Man

Reputation: 769

I have a small nitpick with OP's configuration. If using @KafkaListener with ConcurrentKafkaListenerContainerFactory, dont forget to make the state thread-safe. Using private static int value = 1; isnt going to help. Use AtomicInteger

Upvotes: 0

Amit Nargund
Amit Nargund

Reputation: 226

You need to do the following

1) Set enable-auto-commit property to false

consumerConfigProperties.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, "false");

2) Set the ACK Mode to MANUL_IMMEDIATE

factory.getContainerProperties().setAckMode(AckMode.MANUAL_IMMEDIATE);

3) For processed records you need to call acknowledgment.acknowledge();

4) for failed records call acknowledgment.nack(10); Note: the nack method takes a long parameter which is the sleep time and it should be less than max.poll.interval.ms

Below is a sample code

@KafkaListener(id = "baz", topics = "${message.topic.name}", containerFactory = "containerFactory")
public void listenPEN_RE(@Payload String message,
        @Header(KafkaHeaders.RECEIVED_PARTITION_ID) int partition,
        @Header(KafkaHeaders.OFFSET) int offsets,
        Acknowledgment acknowledgment) {

    if (value%2==0){
        acknowledgment.acknowledge();
    } else {
        acknowledgment.nack(10); //sleep time should be less than max.poll.interval.ms
    }
    value++;
}

Upvotes: 19

Zubair A.
Zubair A.

Reputation: 89

You can do following:
1. store the current record offset to file or DB.
2. Implement your kafka listener class with ConsumerAware.
3. Call registerSeekCallback as given below:

(registerSeekCallback(ConsumerSeekCallback callback) 
      {
      callback.seek(topic, partition, offset)
}

So when the consumer goes down or new consumer is assigned , it start reading fomr the offset stored in your DB.

Upvotes: 3

contactsunny
contactsunny

Reputation: 791

Set the enable-auto-commit property to false:

propsMap.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, false);

Set the ack-mode to MANUAL_IMMEDIATE:

factory.getContainerProperties().setAckMode(AbstractMessageListenerContainer.AckMode.MANUAL_IMMEDIATE);

Then, in your consumer/listener code, you can commit the offset manually, like this:

@KafkaListener(topics = "testKafka")
public void receive(ConsumerRecord<?, ?> consumerRecord,  
        Acknowledgment acknowledgment) {

    System.out.println("Received message: ");
    System.out.println(consumerRecord.value().toString());

    acknowledgment.acknowledge();
}

Update: I created a small POC for this. Check it out here, might help you.

Upvotes: 60

Artem Bilan
Artem Bilan

Reputation: 121550

That doesn't work that way in Apache Kafka.

For the currently running consumer we may never worry about committing offsets. We need them persisted only for new consumers in the same consumer group. The current one track its offset in the memory. I guess somewhere on Broker.

If you need to refetch the same message in the same consumer maybe the next poll round, you should consider to use seek() functionality: https://docs.spring.io/spring-kafka/docs/2.0.1.RELEASE/reference/html/_reference.html#seek

Upvotes: 2

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