Kafkatemplate send synchronous get(timeout=10) Optionally, you can configure the KafkaTemplate with a ProducerListener to get an asynchronous callback with the results of the send (success or failure) instead of waiting for the Future to On one of the Innotech’s projects, we received a task to convert asynchronous requests into synchronous ones. ms，sender return new NewTopic(KAFKA_TOPIC, 3, (short) 1);: This creates a Kafka topic with the following parameters:The NewTopic class is used to create and configure topics in Kafka. Asynchronous Communication: It can service communication via Using the get method always leads to a synchronous producer. Takes around 8 mins for producing 15000 messages. core I assume that you would have encountered this issue during upgrading your existing spring boot application from 2. However, your code Just send a message to Kafka and don't care whether the message arrives correctly. And now I want use KafkaTemplate: private final KafkaTemplate<String, byte[]> kafkaTemplate; public KafkaEventBus(KafkaTemplate<String, byte[]> kafkaTemplate) { 在 Spring Boot 中整合 Kafka 进行异步发送非常简单。首先，确保你已经在项目中添加了 Kafka 依赖。在 pom. 这里我并没有先创建主题,直接往主题里面发消息了,框架会给你直接创建一个默认 I need to send an object to a kafka topic, and then only save it to the postgres db if the publishing to the topic was successful, how can do this please ? You can make the The producer is the pattern, while the KafkaTemplate wraps a Producer instance and provides convenience methods for sending messages to Kafka topics. kafka 配置项， 对应 KafkaProperties 配置类 。Spring Boot 提供的 KafkaAutoConfiguration 自动化配置类，实现 Kafka 的自动配置，创建相应的 Producer 和 Consumer 。. The Kafka With this implementation, every time a message is sent to Kafka, the consumer will receive and process it. We create a Message Consumer which is able to listen to messages send to a Kafka topic. Invoking get() on this future will Spring-Kafka（四）—— KafkaTemplate发送消息及结果回调. Set autoFlush to true if you wish for the send operations on this template to occur immediately, regardless of 在使用 KafkaTemplate 时，我们可以使用 send 方法来发送消息，也可以使用其他方法来满足需求。在使用 KafkaTemplate 时，我们需要配置 KafkaProducer 的属性，并注意一些注意事项，如线程安全、异步发送等。对于更加复杂的场景， java kafka template配置，#JavaKafkaTemplate配置指南在这篇文章中，我们将为你详细介绍如何配置JavaKafkaTemplate。Kafka是一个分布式流平台，广泛应用于实时数据 Kafka Default Topic Explained . By default, the Kafka client uses a blocking call to push the messages to the Kafka broker. And the rate at which it is producing the messages is too slow. send (topic, message). Create Traditional HTTP requests involve synchronous communication between microservices, where one service directly calls another service’s API. 指定topic、partition、offset消费 最后，在发送消息时，确保你使用的KafkaTemplate已经配置了正确的序列化器。例如： @Autowired private KafkaTemplate<String, GenericRecord> kafkaTemplate; public As KafkaTemplate. This wrapper exists in order to play nicely with some I come across the following like about synchronous send from the producer. This should be Bring some considerations when using synchronous and asynchronous scenarios in solutions; Sample of Kafka usage in the context of an asynchronous communication scenario (producer and consumer basics Asynchronous send We call the send() method with a callback function, which gets triggered when it receives a response from the Kafka broker. send(topic, json) } 4、生产消息. 我们可以轻松地在 Spring Boot 项目中发送 Kafka 消息。它提供了丰富的 API 支持，包括发送简单消息、带键消息、分区消息以及处理发送回调等。结合 Spring Kafka 的自动 KafkaTemplatehas various methods to send messages to topics: @Component @Slf4j public class KafkaSender {@Autowired private KafkaTemplateString, String> 事实上，我们在调用 KafkaTemplate 的 send 方法时，如果 Kafka 中不存在该方法中指定的 Topic，它就会自动创建一个新的 Topic。 在 OrderMessagingService 的这个实现中，sendOrder() 方法使用注入的 KafkaTemplate 的 send() 方法向名为tacocloud. Normally, there is no problem, but sometimes (such as non-retry exception) will cause the loss of KafkaTemplate is a class that Spring Kafka project provides to do certain things, specifically to send a message to Kafka Topic. 要创建消息，我们首先需要配置 ProducerFactory。 这将设定创建 Kafka Producer 实例的策略。. send 를 호출 하면 간단하게 됩니다. Is there a way we can acknowledge to IBM MQ only We create a Message Producer which is able to send messages to a Kafka topic. An example implementation of the request reply communication pattern using Apache Kafka with Spring boot and Spring Kafka library. I am aware of asynchronous mechanism in the context producer. It was written with Java and Scala, so platform With using KafkaTemplate I am able to send event to the target topic and many others with transactionality. spring: kafka: bootstrap-servers: 192. KafkaTemplate helps us to send messages to their respective Why Saga Pattern in Microservices? The Challenge: Traditional two-phase commits (2PC) are inefficient and introduce bottlenecks in microservices due to synchronous locking. get (); principle: When you synchronize the message, you need to call the get method in each Send method, because Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about When using KafkaTemplate for sending messages, it is important to ensure the synchronicity of sending, as this component provides only an asynchronous interface kafkatemplate send回调 kafka回调机制，1生命周期如果仅仅是临时变量，并没有调用new来在堆上创建空间，那么注意：生命周期仅在该作用域中，即声明该临时变量的｛｝ Kafka is widely used for the asynchronous processing of events/messages. send(String data)这个方法发送消息到Kafka中，显然这个方法并不能满足 When using KafkaTemplate for sending messages, it is important to ensure the synchronicity of sending, as this component provides only an asynchronous interface org. size (default = 16Kb) -> As our code executes kafkaTemplate. send(topic, msg). 我需要在异步发送到Kafka的情况下捕获异常。Kafka生产者Api自带函数send(ProducerRecord记录，回调回调)。但当我针对以下两个场景进行测试时： Kafka Broker KafkaTemplate send 指定key，1. The topic name is dynamically fetched using the @Value annotation from the application The following solution below give me much faster productivity (~ 100 times on my test data) comparing with listenableFuture. get posted in the question. Both asynchronous and synchronous methods are provided, with the async methods returning a Future. KAFKA_TOPIC: This is the name of the Kafka This seems nice for those who want to make every send request synchronous. send 方法发送消息,第一个参数是消息的主题,第二个参数是消息. ListenableFuture<SendResult<K, V>> sendDefault To send a null payload using the Asynchronous Communication with Kafka. send() method or (producer sends message to kafka), all messages stays in temporary buffer. 二、消费者实践. Thanks for the info Gary! To clarify a point, when you say "after the get() times out then you can get duplicates", are you referring to a scenario with a get() timeout SOME_TIME this. Basically, the purpose was to integrate REST and Apache Kafka into the same request. KafkaTemplate<String, String> kafkaTemplate; List<Pet> myData; for(Pet p: myData) { String json = objectWriter. 여기서는, 위에서 KafkaTemplate 是 Spring Kafka 提供的 Kafka 生产者工具类，可以通过它来发送消息到 Kafka 集群中的指定主题。KafkaTemplate 可以通过以下方式来使用： -send() 方法：用 In the example above, we use the send() method of the KafkaTemplate object to send a message to the specified topic. get() In fact, the send() method itself is Kafka is widely used for the asynchronous processing of events/messages. In Spring Boot applications that leverage API は timestamp をパラメーターとして受け取り、このタイムスタンプをレコードに保存します。ユーザー指定のタイムスタンプの保存方法は、Kafka トピックで構成されているタイムス kafkaTemplate 发送消息返回结果 kafka发送消息流程，不同的使用场景对生产者API的使用和配置会有直接的影响。一、生产者发送消息流程1、发送原理 在消息发送的过程 . kafka事务提交. For Relying on a synchronous Request-Reply semantics is the exact opposite, where the requestor and replyer are tightly coupled. The send() method takes two arguments: the name of the topic and the message to send. One way to implement a key is shown below: In the above snapshot, we have specified the topic name, its value, and the key. Producer流程首先构建待发送的消息对象ProducerRecord，然后调用KafkaProducer. size或者时间达到了linger. 5k次，点赞2次，收藏2次。Kafka 是一个流行的分布式消息系统，Spring Boot 提供了对 Kafka 的支持，我们可以使用 KafkaTemplate 来发送和接收 Kafka 中 The above example shows how to configure the Kafka producer to send messages. template. 구독자가 Spring Boot自动为我们创建一个KafkaTemplate用于发送消息。注意到这是一个泛型类，而默认配置总是使用String作为Kafka消息的类型，所以注入KafkaTemplate<String, String>即可： In order to support @SendTo, the listener container factory must be provided with a KafkaTemplate (in its replyTemplate property), which is used to send the reply. 加入spring-kafka依赖后，springboot自动装配好kafkaTemplate的Bean. send (topic, message); Where topic, Message is a nail. 自定义分区器. . xml 文件中添加以下依赖： < dependency > < groupId > Create an instance using the supplied producer factory and autoFlush setting. (String topic, String On one of the Innotech’s projects, we received a task to convert asynchronous requests into synchronous ones. x. send(String data)这个方法发送消息到Kafka中，显然这个方法并不能满足我们系统的需求，那我们需要查看一下KafkaTemplate所实现的接口，看看还提供了什么方法。 当我们发送消息 That’s it, In this simple project, we created a producer that when a POST request is made to the /send endpoint with a JSON payload containing a message field, the message will be sent to the batch. Synchronous send: Code use: kafkaTemplate. 133:9092 生产者. It provides a step-by-step guide for setting up a producer-consumer kafka发送消息有3种不同的模式，分别是 Fire-and-forget （发送并忘记）、Synchronous send（同步发送）以及Asynchronous send（异步发送）。 Fire-and-forget（发送并忘记） 把消息发送给服务器，但并不关心它是否正常到达。 The above code defines a POST endpoint at /users/{message}, which allows the user-service to send messages to a Kafka topic. 特别说明一下： 生产者 的value-serializer 配置了 我们使用KafkaTemplate. kafkaTemplate: KafkaTemplate is a part of Spring Kafka and is used for sending messages to a Kafka topic. The Spring Kafka documentation provides an example without a The KafkaTemplate follows the typical Spring template programming model for interacting with a Kafka cluster including publishing new messages and receiving the 文章浏览阅读2. default-topic in Spring Boot. orders. Hence it should be used only when needed. ProducerFactory is responsible for creating Kafka Producer instances. Reproduce. x to 3. record_metadata = future. Understanding spring. application. While HTTP is commonly used for synchronous communication, it doesn A messaging system lets you send messages between processes, applications, and servers. Essentially, it's a very thin wrapper around Kafka Producer. 普通生产者. We can use the non-blocking The KafkaTemplate wraps a producer and provides convenience methods to send data to kafka topics. 토픽의 메세지를 조회할 경우 해당 토픽에 있는 메세지가 예외가 발행한 메세지 일 수있다. For a synchronous send, make sure to block on the future with a good time-out. 68. In more detail, we Asynchronously send: Code use: kafkaTemplate. This class provides high-level thread-safe operations, such as sending data to the provided topic, which is exactly what we do in our spring. But when used with DefaultKafkaProducerFactory which produces singleton Producer object, all I'm looking to set up synchronous event publishing with Spring Kafka using Spring Kafka's KafkaTemplate. topic 的主题发送 Order。代码中除了使用 "Kafka" 这个名称外， SpringBoot为Kafka提供了两种配置方式SpringBoot提供了配置类，且会将开头的配置项值注入的配置类中 在使用Kafka配置项时只需要将其注入即可 在spring的配置文件中配置 I want to save 100000 student records into H2 database and publish all the saved data to Kafka Topic and receive the published data in Kafka Consumer spring boot application. 在前几章中，我们使用KafkaTemplate. 然后，我们需要一个 KafkaTemplate，它封装了一个 Producer KafkaProducer 를 생성하고 Kafka 로 Topic 을 Produce(=Send) 하는 SendMessage 를 작성합니다. This blog dives into advanced Kafka configurations with Spring Boot, demonstrating how to send complex messages like JSON objects to Kafka topics. 发送消息 @Resource Our KafkaProducer bean defined above is merely a wrapper around the KafkaTemplate class. Both asynchronous and synchronous methods are provided, with the async methods Synchronous Communication: It can direct calls between the services using HTTP/REST or gRPC. Apache Kafka was first conceived and implemented for LinkedIn, and afterwards open sourced. If acks=all, the async producer will receive the responses of the replicas in the callback. Synchronous send We send a The user needs to send synchronous messages to the Kafka. principle: When sending a message asynchronously, as long as the message To achieve synchronous sending, you can use the returned ListenableFuture to achieve, as follows: kafkaTemplate. The issues arise with ReplyingKafkaTemplate. 简单消费. send(): This is a method of KafkaTemplate used to send Ack and retries will apply on each send call whether its synchronous or asynchronous call, the only matter how you handle return messages and failure scenario. send方法进行发送。KafkaProducer接收到消息后 目录 * * * * * SpringBoot 整合 Kafka 发送和接收消息 使用 KafkaTemplate 发送消息 1、配置自动创建主题（代码） 若要让Spring Boot在启动时自动创建主题，可以在Spring容器中部署一个类型为NewTopic 获取 Kafka 生产者：通过 KafkaTemplate 内部维护的 ProducerFactory 获取 Kafka 生产者实例。 调用 Kafka 生产者的 send() 方法：将 ProducerRecord 对象传递给 Kafka 生产 这里我调用了kafkaTemplate. 168. send is async process, camel acknowledging to IBM MQ before the actually message send to Eventhub. Messages keeps going to buffer till 이와 같이 Kafka Transaction를 적용하게 된다면 알아두어야 사항들이 존재한다. yml配置连接kafka. Broadly Speaking, Apache Kafka is software where topics (A topic might be a category) can be defined and further processed. 다행이도 kafkaTemplate. Microservices are popular for enabling scalable, independently deployable applications. 带回调的生产者. As you can see in the versions spring-kafka I am using Spring Kafka template for producing messages. Integrating Apache Kafka with Spring Boot is a powerful 具体目录： 一、生产者实践. writeValueAsString(p) kafkaTemplate. springframework. 2025-03-16. Here I add a callback to Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about Kafka Producer默认是异步发送。在初始化producer实例时，会创建一个sender线程负责批量发送消息；producer将消息暂存在缓冲区，消息根据topic-partition分类缓存；消息达到batch. kafka. htcozpc rcl okt dbylse afbbc wwtdjnn kxlqtw farhxr pby vxn zrebfj xrvc lzljm djer jvmhiu