2 Consumers of same topic

Friends,

Since using the latest version of spring cloud and spring-cloud-stream-binder-kafka-streams:3.2.1

I lost the ability to have 2 consumers against the same topic. The spring code actually creates the binder proxy against the topic name. Since another already exists it throws a duplicate bean exception. Another project I am using spring-cloud-stream-binder-kafka-streams:3.0.9.RELEASE and I don’t have this problem. Another use posted this issue but then closed it so perhaps its a config thing.

My config is quite basic.

spring:
  cloud:
    stream:
      function:
        definition: func1,func2
        bindings:
          func1-in-0:
            destination: topic1
          func2-in-0:
            destination: topic1

The root issue is that a bean is put as the topic name.

KafkaStreamsBindableProxyFactory.bindInput

            private void bindInput(ResolvableType arg0, String inputName) {
		            if (arg0.getRawClass() != null) {
			            KafkaStreamsBindableProxyFactory.this.inputHolders.put(inputName,
					            new BoundTargetHolder(getBindingTargetFactory(arg0.getRawClass())
							            .createInput(inputName), true));
		            }
		            BeanDefinitionRegistry registry = (BeanDefinitionRegistry) beanFactory;
		            RootBeanDefinition rootBeanDefinition = new RootBeanDefinition();
		            rootBeanDefinition.setInstanceSupplier(() -> inputHolders.get(inputName).getBoundTarget());
		            registry.registerBeanDefinition(inputName, rootBeanDefinition);
            }

In older versions and my other project kafka streams uses the binding name: func1-in-0 in the code above but the latest version use topic name. The documentation still defines the configuration the same in both versions.

[chrismpalmer]

Quick response thanks and I am glad its not a bug.

[chrismpalmer]

Thank you.