我在ec2示例上部署了kafka集群 ip a.b.c.d ，生产者和使用者也部署在另一个ec2示例上（都在同一个示例上） ip a2.b2.c2.d2 ，在 catalina.out 的日志文件 producer/consumer 我总是对错误进行罚款

java.net.UnknownHostException: ip-a2-b2-c2-d2: ip-a2-b2-c2-d2: Name or service not known
        at java.net.InetAddress.getLocalHost(InetAddress.java:1496)
        at kafka.consumer.ZookeeperConsumerConnector.<init>(ZookeeperConsumerConnector.scala:107)
        at kafka.consumer.ZookeeperConsumerConnector.<init>(ZookeeperConsumerConnector.scala:128)
        at kafka.consumer.Consumer$.create(ConsumerConnector.scala:89)
        at kafka.consumer.Consumer.create(ConsumerConnector.scala)
        at com.wsg.promo.kafka.listener.ConsumerClient.run(ConsumerClient.java:90)
        at com.wsg.promo.kafka.listener.ConsumerClient.run(ConsumerClient.java:62)
Caused by: java.net.UnknownHostException: ip-a2-b2-c2-d2: Name or service not known
        at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
        at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:922)
        at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1316)
        at java.net.InetAddress.getLocalHost(InetAddress.java:1492)
        ... 6 more

哪个州 producer/consumer 机器试图连接到自身( ip-a2-b2-c2-d2 是为了 producer/consumer 机器），
为什么是 producer/consumer 机器试图连接到自身(这正常吗？）我如何解决这个问题？我已经花了16个小时了。想弄清楚，但运气不好