什么是Spring KafkaListener 多主题阅读攻略？

Question

Kafka 如何处理多个主题？

 @KafkaListener(topics = {"topic1" , "topic2"}, groupId = "groupid")

例如：

• “topic1”在单个分区上有“topic1_message1”、“topic1_message2”个实体
• “topic2”在单个分区上有“topic2_message1”、“topic2_message2”个实体

阅读顺序是什么？

• "topic1_message1","topic1_message2","topic2_message1","topic2_message2"
• "topic1_message1","topic2_message1","topic1_message2","topic2_message2"

或者服务器会实例化两个同时读取两个主题的线程？

Answer 1

这两个都是真的。是随机的

• "topic1_message1","topic1_message2","topic2_message1","topic2_message2"
• "topic1_message1","topic2_message1","topic1_message2","topic2_message2"

因为它们在单个分区上，所以你应该知道一件事；

1. "topic1_message1" 在"topic1_message2"
之前
2. "topic2_message1" 在"topic2_message2"
之前