a spring kafka consumer with multiple brokers

I'm currently implementing kafka listener with spring kafka.
And now I'm little bit because my listener sometimes could not be assigned to partition so could not receive any message from one of the brokers.

current situation

I have two brokers and each broker has one topic which includes only one partition.(topic name is same)

Maybe I'm having wrong idea for setting my kafka listener to take messages from both two brokers. However, is following sentence proper guess?

Are Passing two brokers' host to listener and Setting concurrency to 2 enough config because I have two partitions (one in broker1 and other one in broker2)?

what I did

create a listener with annotation

@KafkaListener(topics = "$Topic1" , containerFactory = "kafkaListenerContainerFactory")

set its concurrency to 2

factory.setConcurrency(2);

give array of brokers

props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, [123.123.123:9092, 211.211.211:9094]);

set group

props.put(ConsumerConfig.GROUP_ID_CONFIG, "testgroup");

set partition assignment strategy with round robin way

props.put(ConsumerConfig.PARTITION_ASSIGNMENT_STRATEGY_CONFIG, RoundRobinAssignor.class.getName());

what I expected

being able to receive messages from both brokers but sometimes could not get any message from one of two brokers

If the brokers are in the same cluster it should work OK.

If the brokers are not part of the same cluster, you must add two @KafkaListener annotations, each one using a container factory that points to each cluster. Or, you can use the properties attribute on one of the annotations to override the ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG property.