Support kafka parallel-consumer #2381
Comments
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No plans currently; but contributions are welcome! |
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That said; it's easy enough to use it. from Spring - just set up a @SpringBootApplication
public class Kgh2381Application {
private static final Logger log = LoggerFactory.getLogger(Kgh2381Application.class);
public static void main(String[] args) {
SpringApplication.run(Kgh2381Application.class, args);
}
@KafkaListener(id = "kgh2381", topics = "kgh2381", autoStartup = "false")
void listen(String in) {
log.info(in);
}
@Bean
public NewTopic topic() {
return TopicBuilder.name("kgh2381").partitions(1).replicas(1).build();
}
@Bean
ApplicationRunner runner(KafkaListenerEndpointRegistry registry, ConsumerFactory<String, String> cf,
KafkaTemplate<String, String> template) {
return args -> {
MessageListener messageListener = (MessageListener) registry.getListenerContainer("kgh2381")
.getContainerProperties().getMessageListener();
Consumer<String, String> consumer = cf.createConsumer("group", "");
var options = ParallelConsumerOptions.<String, String>builder()
.ordering(ProcessingOrder.KEY)
.consumer(consumer)
.maxConcurrency(10)
.build();
ParallelStreamProcessor<String, String> processor = ParallelStreamProcessor
.createEosStreamProcessor(options);
processor.subscribe(List.of("kgh2381"));
processor.poll(context -> messageListener.onMessage(context.getSingleConsumerRecord(), null, consumer));
IntStream.range(0, 10).forEach(i -> template.send("kgh2381", "foo" + i));
};
}
} |
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I am trying to implement the parallel consumer in spring boot and using the above mentioned way. I have main class in separate java file and rest of the methods(KafkaListener, ApplicationRunner) in another java file. Also, have created a ConsumerProp class with the below content: @EnableKafka
@Configuration
public class ConsumerProp {
@Bean
public ConsumerFactory<String, String> consumerFactory() {
Map<String, Object> configs = new HashMap<>();
configs.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "kafka:9092");
configs.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
configs.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
configs.put(ConsumerConfig.GROUP_ID_CONFIG, "group_1");
return new DefaultKafkaConsumerFactory<>(configs);
}
}But the spring boot just exists without even any error. Could you please help or put a sample working example which I can leverage for further use. |
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I assume you mean exits (not exists). You must have done something wrong; the example above is a complete working example using Spring Boot. This is the output when running it... |
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This is its application.properties spring.kafka.consumer.auto-offset-reset=earliest
spring.kafka.consumer.enable-auto-commit=false
That file must be annotated with You don't need your own consumer factory bean, just use Boot's. |
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Thank for the correcting the type(exits). I was able to run the application by specifying I am using consumer factory bean as I need to provide few properties dynamically(some cases from environment variables). Like Bootstrap server etc.. If that's okay with you I really would like you to share the sample project you just ran above. Thanks again for all the help. |
There's nothing more to share; that is the entire app (together with the properties above). |
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As you stated earlier 'You don't need your own consumer factory bean, just use Boot's.' I have just observed that the runner method is using the spring boot's consumer factory only, the one I have created is not being used. Could you please help me what should I do use the consumer factory I have created. |
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Since you define your own consumer factory bean, Boot will detect it and not declare its own; yours will be injected into the runner instead. |
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@Bean
@ConditionalOnMissingBean(ConsumerFactory.class)
public DefaultKafkaConsumerFactory<?, ?> kafkaConsumerFactory(Your |
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As of now I am trying with the spring boot's consumer factory. My application is stuck at I am not very good at spring boot yet, Sorry for asking the small doubts. |
You have to start the container to consume. |
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Sorry, did not get what do you mean by container. I am running the application in Intellij idea and the Kafka is up and running. |
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Do you mean by setting the |
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Could you please help me in understanding why Ideally it should call the listen method as soon as there is a message to consume as defined below. |
After adding the below line I was able to consume the messages. but each message is being consumed 2 times,, Could you please help me with that. Could you please help me with what/where is the right way to start the container. Output: If you don't mind could you please send your running project example to my email id '[email protected]' for reference. Or can upload on the github so that it could help others. |
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Sorry, I forgot this was about the parallel consumer. You should not start the container. It looks like you are seeing data. As I said, there is nothing else to share, just copy/paste the code into a class named |
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Previous .tgz was missing the |
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Thanks a lot for sharing the project.
And on the custom consumer factory (don't want to use the spring boot's config) what changes do I need to do in the ConsumerProp class. This is the current ConsumerProp class. I just wanted to use the below DefaultKafkaConsumerFactory instead of the default spring boot's consumer factory. |
Why? Just add the bean and it will replace Boot's. If it's in a separate file ( |
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Hi, @garyrussell |
Expected Behavior
Enable parallel processing of the messages in single consumer.
Current Behavior
Single-threaded processing of the messages.
Context
Are there any plans to include
ParallelStreamProcessoras an option for spring-kafka? https://github.com/confluentinc/parallel-consumer It should handle automatically multiple threads, acking and other stuff (synchronization on same key if needed etc.).Currently I can configure this manually, but would be easier I guess If I would only need to implement
void poll(Consumer<PollContext<K, V>> usersVoidConsumptionFunction);, and the rest is taken care by the spring.The text was updated successfully, but these errors were encountered: