当我重新启动我的 kafka 代理时，为什么或如何丢失很少的消息? [英] why or how we lose few messages when i restart my kafka broker?
本文介绍了当我重新启动我的 kafka 代理时，为什么或如何丢失很少的消息?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我在单节点中运行 kafka，我想在关闭我的 kafka 代理时看到 kafka Producer 的行为，然后我在几秒钟内重新启动我的代理，所以我创建了 Spring Boot 项目，我可能会在其中发送 1000 个客户 JSON 对象和打印每次发送的 JSON 对象的偏移量.我的应用程序工作正常，但是当我关闭我的 kafka 代理时，几秒钟后我重新启动我的代理，我的生产者返回以正常发送来自最新偏移量的对象.对于我的示例，当控制台中的偏移量 = 983 时，我关闭了我的 kafka，当我再次启动我的代理时，我看到 kafka 开始从 offset =984 发送消息，但我发现 3或 4 条消息因此消息错误而丢失！！！
I m running kafka in single node ,i want to see the kafka Producer behavior when i shutdown my kafka broker then i restart my broker in few secondes,so i create spring boot projet where i might to send 1000 customer JSON object and print the offset of the JSON object sended everytime. My application works fine but when i shutdown my kafka broker and after few second i Restart my broker ,my producer return to send the objects from the latest offset normally. The problem that for my example when the offset = 983 in the console ,i down my kafka and when i start my broker again, i see that kafka start sending messages from offset =984 but i find that 3 or 4 messages are lost with this message error!!!
983
offset acked
2019-04-01 16:20:34.635 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null) is unavailable or invalid, will attempt rediscovery
2019-04-01 16:20:34.638 INFO 7656 --- [ntainer#0-0-C-1] o.a.kafka.clients.FetchSessionHandler : [Consumer clientId=consumer-2, groupId=jsa-group] Error sending fetch request (sessionId=1910675333, epoch=31) to node 0: org.apache.kafka.common.errors.DisconnectException.
2019-04-01 16:20:34.689 WARN 7656 --- [ntainer#0-0-C-1] org.apache.kafka.clients.NetworkClient : [Consumer clientId=consumer-2, groupId=jsa-group] Connection to node 0 could not be established. Broker may not be available.
2019-04-01 16:20:34.844 WARN 7656 --- [ntainer#0-0-C-1] org.apache.kafka.clients.NetworkClient : [Consumer clientId=consumer-2, groupId=jsa-group] Connection to node 0 could not be established. Broker may not be available.
2019-04-01 16:20:35.050 WARN 7656 --- [ntainer#0-0-C-1] org.apache.kafka.clients.NetworkClient : [Consumer clientId=consumer-2, groupId=jsa-group] Connection to node 0 could not be established. Broker may not be available.
2019-04-01 16:20:35.557 WARN 7656 --- [ntainer#0-0-C-1] org.apache.kafka.clients.NetworkClient : [Consumer clientId=consumer-2, groupId=jsa-group] Connection to node 0 could not be established. Broker may not be available.
.........
dali 36
2019-04-01 16:20:55.592 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Discovered group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null)
2019-04-01 16:20:55.594 ERROR 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Offset commit failed on partition jsa-kafka-topic-0 at offset 984: This is not the correct coordinator.
2019-04-01 16:20:55.594 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null) is unavailable or invalid, will attempt rediscovery
2019-04-01 16:20:55.696 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Discovered group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null)
2019-04-01 16:20:55.696 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null) is unavailable or invalid, will attempt rediscovery
984
offset acked
985
offset acked
986
offset acked
987
offset acked
988
offset acked
989
offset acked
990
offset acked
991
offset acked
992
offset acked
993
offset acked
994
offset acked
995
offset acked
996
offset acked
997
offset acked
998
offset acked
999
offset acked
1000
offset acked
1001
offset acked
1002
offset acked
1003
offset acked
1004
offset acked
2019-04-01 16:20:55.799 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Discovered group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null)
2019-04-01 16:20:55.803 ERROR 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Offset commit failed on partition jsa-kafka-topic-0 at offset 984: This is not the correct coordinator.
2019-04-01 16:20:55.803 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null) is unavailable or invalid, will attempt rediscovery
2019-04-01 16:20:55.904 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Discovered group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null)
2019-04-01 16:20:55.904 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null) is unavailable or invalid, will attempt rediscovery
2019-04-01 16:20:56.006 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Discovered group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null)
2019-04-01 16:20:56.010 ERROR 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Offset commit failed on partition jsa-kafka-topic-0 at offset 984: This is not the correct coordinator.
2019-04-01 16:20:56.011 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null) is unavailable or invalid, will attempt rediscovery
2019-04-01 16:20:56.111 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Discovered group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null)
2019-04-01 16:20:56.111 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null) is unavailable or invalid, will attempt rediscovery
2019-04-01 16:20:56.213 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Discovered group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null)
2019-04-01 16:20:56.215 ERROR 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Offset commit failed on partition jsa-kafka-topic-0 at offset 984: This is not the correct coordinator.
2019-04-01 16:20:56.215 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null) is unavailable or invalid, will attempt rediscovery
2019-04-01 16:20:56.317 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Discovered group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null)
2019-04-01 16:20:56.317 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null) is unavailable or invalid, will attempt rediscovery
2019-04-01 16:20:56.419 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Discovered group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null)
2019-04-01 16:20:56.422 ERROR 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Offset commit failed on partition jsa-kafka-topic-0 at offset 984: This is not the correct coordinator.
2019-04-01 16:20:56.422 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null) is unavailable or invalid, will attempt rediscovery
2019-04-01 16:20:56.523 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Discovered group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null)
2019-04-01 16:20:56.523 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null) is unavailable or invalid, will attempt rediscovery
dali 37
1005
offset acked
2019-04-01 16:20:56.625 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Discovered group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null)
2019-04-01 16:20:56.628 ERROR 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Offset commit failed on partition jsa-kafka-topic-0 at offset 984: This is not the correct coordinator.
2019-04-01 16:20:56.628 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null) is unavailable or invalid, will attempt rediscovery
2019-04-01 16:20:56.729 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Discovered group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null)
2019-04-01 16:20:56.729 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null) is unavailable or invalid, will attempt rediscovery
2019-04-01 16:20:56.831 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Discovered group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null)
2019-04-01 16:20:56.834 ERROR 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Offset commit failed on partition jsa-kafka-topic-0 at offset 984: This is not the correct coordinator.
2019-04-01 16:20:56.834 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null) is unavailable or invalid, will attempt rediscovery
2019-04-01 16:20:56.936 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Discovered group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null)
2019-04-01 16:20:56.936 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null) is unavailable or invalid, will attempt rediscovery
2019-04-01 16:20:57.037 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Discovered group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null)
2019-04-01 16:20:57.040 ERROR 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Offset commit failed on partition jsa-kafka-topic-0 at offset 984: This is not the correct coordinator.
2019-04-01 16:20:57.040 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null) is unavailable or invalid, will attempt rediscovery
2019-04-01 16:20:57.140 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Discovered group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null)
2019-04-01 16:20:57.141 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null) is unavailable or invalid, will attempt rediscovery
2019-04-01 16:20:57.245 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Discovered group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null)
2019-04-01 16:20:57.252 ERROR 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Offset commit failed on partition jsa-kafka-topic-0 at offset 984: This is not the correct coordinator.
2019-04-01 16:20:57.252 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null) is unavailable or invalid, will attempt rediscovery
2019-04-01 16:20:57.358 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Discovered group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null)
2019-04-01 16:20:57.358 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null) is unavailable or invalid, will attempt rediscovery
2019-04-01 16:20:57.460 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Discovered group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null)
2019-04-01 16:20:57.466 ERROR 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Offset commit failed on partition jsa-kafka-topic-0 at offset 984: This is not the correct coordinator.
2019-04-01 16:20:57.467 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null) is unavailable or invalid, will attempt rediscovery
2019-04-01 16:20:57.567 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Discovered group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null)
2019-04-01 16:20:57.568 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null) is unavailable or invalid, will attempt rediscovery
dali 38
1006
offset acked
2019-04-01 16:20:57.671 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Discovered group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null)
2019-04-01 16:20:57.681 ERROR 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Offset commit failed on partition jsa-kafka-topic-0 at offset 984: This is not the correct coordinator.
2019-04-01 16:20:57.681 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null) is unavailable or invalid, will attempt rediscovery
2019-04-01 16:20:57.785 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Discovered group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null)
2019-04-01 16:20:57.786 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null) is unavailable or invalid, will attempt rediscovery
2019-04-01 16:20:57.889 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Discovered group coordinator dali-X556UJ:9092 (id: 2147483647 rack: null)
2019-04-01 16:20:57.896 ERROR 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Offset commit failed on partition jsa-kafka-topic-0 at offset 984: The coordinator is loading and hence can't process requests.
2019-04-01 16:20:58.007 ERROR 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Offset commit failed on partition jsa-kafka-topic-0 at offset 984: The coordinator is loading and hence can't process requests.
2019-04-01 16:20:58.125 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Revoking previously assigned partitions [jsa-kafka-topic-0]
2019-04-01 16:20:58.125 INFO 7656 --- [ntainer#0-0-C-1] o.s.k.l.KafkaMessageListenerContainer : partitions revoked: [jsa-kafka-topic-0]
2019-04-01 16:20:58.125 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] (Re-)joining group
2019-04-01 16:20:58.149 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.AbstractCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Successfully joined group with generation 31
2019-04-01 16:20:58.149 INFO 7656 --- [ntainer#0-0-C-1] o.a.k.c.c.internals.ConsumerCoordinator : [Consumer clientId=consumer-2, groupId=jsa-group] Setting newly assigned partitions [jsa-kafka-topic-0]
2019-04-01 16:20:58.154 INFO 7656 --- [ntainer#0-0-C-1] o.s.k.l.KafkaMessageListenerContainer : partitions assigned: [jsa-kafka-topic-0]
dali 39
1007
offset acked
dali 40
1008
offset acked
dali 41
1009
offset acked
dali 42
1010
offset acked
dali 43
1011
offset acked
//...continue to send normally
为什么我的消息带有 offset=1004 和 offset=1005 和 offset=1006，而第一条消息带有 offset=983(当我关闭我的经纪人时)当我再次启动我的 kafka 经纪人时未能发送.
Why my messages with offset=1004 and offset=1005 andd offset=1006 and the first message with offset=983(when i down my broker) failed to be send when i start my kafka broker again.
//我的主类
public static void main(String[] args) {
SpringApplication.run(SpringKafkaSendConsumeJavaObjectApplication.class, args);
}
@Bean
ApplicationRunner run(CustomerRepository personRepository) {
return args -> {
List<Customer> list = new ArrayList<>(100);
for (int i = 0; i < 100; i++) {
list.add(new Customer("dali "+i, 25, "homme"));
Runnable runnable = new MyRunnable(list,producer);
runnable.run();
};
}
这是我的运行方法，我每一秒发送一个客户
this is my run method where i send one customer every ONE second
public class MyRunnable implements Runnable {
private static final Logger LOGGER = LoggerFactory.getLogger(MyRunnable.class);
private List<Customer> customers;
private KafkaProducer kafkaProducer;
public MyRunnable(List<Customer> customers,KafkaProducer kafkaProducer) {
this.customers = customers.stream().collect(Collectors.toList());
this.kafkaProducer = kafkaProducer;
}
@Override
public void run() {
customers.forEach(customer -> {
System.out.println(customer.getName());
kafkaProducer.send(customer);
try {
Thread.sleep(1000);//1second
} catch (InterruptedException e) {
e.printStackTrace();
}
});
}
//这是我的发送方法
@Service
public class KafkaProducer {
private static final Logger LOGGER=LoggerFactory.getLogger(KafkaProducer.class);
@Autowired
private KafkaTemplate<String, Customer> kafkaTemplate;
@Value("${jsa.kafka.topic}")
String kafkaTopic = "jsa-test";
@Async
public void send(Customer customer) {
//LOGGER.info("sending data= '{}' " , customer);
ListenableFuture<SendResult<String,Customer>> listenableFuture = kafkaTemplate.send(kafkaTopic ,customer);
listenableFuture.addCallback(new ListenableFutureCallback<SendResult<String,Customer>>() {
@Override
public void onFailure(Throwable throwable) {
System.out.println(throwable.getMessage());
}
@Override
public void onSuccess(final SendResult<String, Customer> message) {
System.out.println(message.getRecordMetadata().offset());
System.out.println("offset acked");
}
});
}
//这是我在application.properties中的kafka配置
//this is my kafka config in application.properties
#Kafka Cluster
jsa.kafka.bootstrap-servers=localhost:9092
#consumer group id
jsa.kafka.consumer.group-id=jsa-group
#topic name
jsa.kafka.topic=jsa-kafka-topic
#server port
server.port=9000
#reconnect.backoff.ms=10000
#Integer.MAX_VALUE
retries=2147483647
retry.backoff.ms=1000
#5 minutes
request.timeout.ms=305000
#Integer.MAX_VALUE
max.block.ms=2147483647
推荐答案
要么需要等待KafkaTemplate.send()Future> 方法，或在停止应用之前调用 kafkaTemplate.flush().
You either need to wait for the Future<?> returned by the KafkaTemplate.send() method, or call kafkaTemplate.flush() before stopping your app.
KafkaProducer.flush() Javadocs
/**
* Invoking this method makes all buffered records immediately available to send (even if <code>linger.ms</code> is
* greater than 0) and blocks on the completion of the requests associated with these records. The post-condition
* of <code>flush()</code> is that any previously sent record will have completed (e.g. <code>Future.isDone() == true</code>).
* A request is considered completed when it is successfully acknowledged
* according to the <code>acks</code> configuration you have specified or else it results in an error.
* <p>
* Other threads can continue sending records while one thread is blocked waiting for a flush call to complete,
* however no guarantee is made about the completion of records sent after the flush call begins.
* <p>
* This method can be useful when consuming from some input system and producing into Kafka. The <code>flush()</code> call
* gives a convenient way to ensure all previously sent messages have actually completed.
* <p>
* This example shows how to consume from one Kafka topic and produce to another Kafka topic:
* <pre>
* {@code
* for(ConsumerRecord<String, String> record: consumer.poll(100))
* producer.send(new ProducerRecord("my-topic", record.key(), record.value());
* producer.flush();
* consumer.commit();
* }
* </pre>
*
* Note that the above example may drop records if the produce request fails. If we want to ensure that this does not occur
* we need to set <code>retries=<large_number></code> in our config.
* </p>
* <p>
* Applications don't need to call this method for transactional producers, since the {@link #commitTransaction()} will
* flush all buffered records before performing the commit. This ensures that all the {@link #send(ProducerRecord)}
* calls made since the previous {@link #beginTransaction()} are completed before the commit.
* </p>
*
* @throws InterruptException If the thread is interrupted while blocked
*/
@Override
public void flush() {
这篇关于当我重新启动我的 kafka 代理时，为什么或如何丢失很少的消息?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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