从Kafka消息在春季侦探中注入TraceId

Question

I am working on multiple microservice architecture ,where entry point is from Kafka. eg., lets suppose we have three microservice micro1,micro2 and micro3 request in micro1 comes from kafka message queue,and it further communicate with micro2 and micro3 via Rest client.

Message which is recieved by micro1 contains requestId , which I need to put in place of TraceId in spring sleuth and that should be propogated across all microservice.

I have tried this by MDC but in that case traceId is not propogating to other microservices.

Is there any other way to implement custom TraceId in sleuth instead of Auto generated?

thanks!!

Answer 1

I don't think it's a good idea. Leave the generated trace id and create another generated field that will be propagated as baggage.

If you really need to change the way the ID is generated then you have to change this bean

https://github.com/spring-cloud/spring-cloud-sleuth/blob/v2.0.2.RELEASE/spring-cloud-sleuth-core/src/main/java/org/springframework/cloud/sleuth/autoconfig/TraceAutoConfiguration.java#L113-L133

@Bean
    @ConditionalOnMissingBean
    Propagation.Factory sleuthPropagation(SleuthProperties sleuthProperties) {
        if (sleuthProperties.getBaggageKeys().isEmpty() && sleuthProperties.getPropagationKeys().isEmpty()) {
            return B3Propagation.FACTORY;
        }
        ExtraFieldPropagation.FactoryBuilder factoryBuilder = ExtraFieldPropagation
                .newFactoryBuilder(B3Propagation.FACTORY);
        if (!sleuthProperties.getBaggageKeys().isEmpty()) {
            factoryBuilder = factoryBuilder
                    // for HTTP
                    .addPrefixedFields("baggage-", sleuthProperties.getBaggageKeys())
                    // for messaging
                    .addPrefixedFields("baggage_", sleuthProperties.getBaggageKeys());
        }
        if (!sleuthProperties.getPropagationKeys().isEmpty()) {
            for (String key : sleuthProperties.getPropagationKeys()) {
                factoryBuilder = factoryBuilder.addField(key);
            }
        }
        return factoryBuilder.build();
    }