[英]Handling dead letter queue with delay
I want to do the following: when a message fails and falls to my dead letter queue, I want to wait 5 minutes and republishes the same message on my queue.我想执行以下操作:当消息失败并落入我的死信队列时,我想等待 5 分钟并在我的队列中重新发布相同的消息。
Today, using Spring Cloud Streams and RabbitMQ, I did the following code Based on this documentation :今天,使用 Spring Cloud Streams 和 RabbitMQ,我根据这个文档做了以下代码:
@Component
public class HandlerDlq {
private static final Logger LOGGER = LoggerFactory.getLogger(HandlerDlq.class);
private static final String X_RETRIES_HEADER = "x-retries";
private static final String X_DELAY_HEADER = "x-delay";
private static final int NUMBER_OF_RETRIES = 3;
private static final int DELAY_MS = 300000;
private RabbitTemplate rabbitTemplate;
@Autowired
public HandlerDlq(RabbitTemplate rabbitTemplate) {
this.rabbitTemplate = rabbitTemplate;
}
@RabbitListener(queues = MessageInputProcessor.DLQ)
public void rePublish(Message failedMessage) {
Map<String, Object> headers = failedMessage.getMessageProperties().getHeaders();
Integer retriesHeader = (Integer) headers.get(X_RETRIES_HEADER);
if (retriesHeader == null) {
retriesHeader = 0;
}
if (retriesHeader > NUMBER_OF_RETRIES) {
LOGGER.warn("Message {} added to failed messages queue", failedMessage);
this.rabbitTemplate.send(MessageInputProcessor.FAILED, failedMessage);
throw new ImmediateAcknowledgeAmqpException("Message failed after " + NUMBER_OF_RETRIES + " attempts");
}
retriesHeader++;
headers.put(X_RETRIES_HEADER, retriesHeader);
headers.put(X_DELAY_HEADER, DELAY_MS * retriesHeader);
LOGGER.warn("Retrying message, {} attempts", retriesHeader);
this.rabbitTemplate.send(MessageInputProcessor.DELAY_EXCHANGE, MessageInputProcessor.INPUT_DESTINATION, failedMessage);
}
@Bean
public DirectExchange delayExchange() {
DirectExchange exchange = new DirectExchange(MessageInputProcessor.DELAY_EXCHANGE);
exchange.setDelayed(true);
return exchange;
}
@Bean
public Binding bindOriginalToDelay() {
return BindingBuilder.bind(new Queue(MessageInputProcessor.INPUT_DESTINATION)).to(delayExchange()).with(MessageInputProcessor.INPUT_DESTINATION);
}
@Bean
public Queue parkingLot() {
return new Queue(MessageInputProcessor.FAILED);
}
}
My MessageInputProcessor
interface:我的
MessageInputProcessor
接口:
public interface MessageInputProcessor {
String INPUT = "myInput";
String INPUT_DESTINATION = "myInput.group";
String DLQ = INPUT_DESTINATION + ".dlq"; //from application.properties file
String FAILED = INPUT + "-failed";
String DELAY_EXCHANGE = INPUT_DESTINATION + "-DlqReRouter";
@Input
SubscribableChannel storageManagerInput();
@Input(MessageInputProcessor.FAILED)
SubscribableChannel storageManagerFailed();
}
And my properties file:还有我的属性文件:
#dlx/dlq setup - retry dead letter 5 minutes later (300000ms later)
spring.cloud.stream.rabbit.bindings.myInput.consumer.auto-bind-dlq=true
spring.cloud.stream.rabbit.bindings.myInput.consumer.republish-to-dlq=true
spring.cloud.stream.rabbit.bindings.myInput.consumer.dlq-ttl=3000
spring.cloud.stream.rabbit.bindings.myInput.consumer.delayedExchange=true
#input
spring.cloud.stream.bindings.myInput.destination=myInput
spring.cloud.stream.bindings.myInput.group=group
With this code, I can read from dead letter queue, capture the header but I can't put it back to my queue (the line LOGGER.warn("Retrying message, {} attempts", retriesHeader);
only runs once, even if I put a very slow time).使用此代码,我可以从死信队列中读取,捕获标头,但无法将其放回我的队列(
LOGGER.warn("Retrying message, {} attempts", retriesHeader);
仅运行一次,即使如果我把时间放得很慢)。
My guess is that the method bindOriginalToDelay
is binding the exchange to a new queue, and not mine.我的猜测是方法
bindOriginalToDelay
将交换绑定到一个新队列,而不是我的。 However, I didn't find a way to get my queue to bind there instead of creating a new one.但是,我没有找到一种方法让我的队列绑定到那里而不是创建一个新队列。 But I'm not even sure this is the error.
但我什至不确定这是错误。
I've also tried to send to MessageInputProcessor.INPUT
instead of MessageInputProcessor.INPUT_DESTINATION
, but it didn't work as expected.我也尝试发送到
MessageInputProcessor.INPUT
而不是MessageInputProcessor.INPUT_DESTINATION
,但它没有按预期工作。
Also, unfortunately, I can't update Spring framework due to dependencies on the project...另外,不幸的是,由于对项目的依赖,我无法更新 Spring 框架......
Could you help me with putting back the failed message on my queue after some time?你能帮我在一段时间后把失败的消息放回我的队列吗? I really didn't want to put a
thread.sleep
there...我真的不想在那里放一个
thread.sleep
...
With that configuration, myInput.group
is bound to the delayed (topic) exchange myInput
with routing key #
.使用该配置,
myInput.group
绑定到延迟(主题)交换myInput
与路由键#
。
You should probably remove spring.cloud.stream.rabbit.bindings.myInput.consumer.delayedExchange=true
because you don't need the main exchange to be delayed.您可能应该删除
spring.cloud.stream.rabbit.bindings.myInput.consumer.delayedExchange=true
因为您不需要延迟主交换。
It will also be bound to your explicit delayed exchange, with key myInput.group
.它也将绑定到您的显式延迟交换,密钥为
myInput.group
。
Everything looks correct to me;在我看来,一切都是正确的; you should see the same (single) queue bound to two exchanges:
您应该看到绑定到两个交换机的相同(单个)队列:
The myInput.group.dlq
is bound to DLX
with key myInput.group
myInput.group.dlq
与键myInput.group
绑定到DLX
You should set a longer TTL and examine the message in the DLQ to see if something stands out.您应该设置更长的 TTL 并检查 DLQ 中的消息以查看是否有突出显示。
EDIT编辑
I just copied your code with a 5 second delay and it worked fine for me (with turning off the delay on the main exchange).我刚刚复制了您的代码,延迟了 5 秒,对我来说效果很好(关闭了主交换机的延迟)。
Retrying message, 4 attempts
and和
added to failed messages queue
Perhaps you thought it was not working because you have a delay on the main exchange too?也许您认为它不起作用是因为您在主交易所也有延迟?
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