报错异常信息：UnknownHostException

10:52:12.565 [kafka-producer-network-thread | client1] WARN org.apache.kafka.clients.NetworkClient - [Producer clientId=client1] Error connecting to node aaaa-9930:9092 (id: 0 rack: null)
java.net.UnknownHostException: aaaa-9930
at java.net.InetAddress.getAllByName0(InetAddress.java:1259)
at java.net.InetAddress.getAllByName(InetAddress.java:1171)
at java.net.InetAddress.getAllByName(InetAddress.java:1105)
at org.apache.kafka.clients.ClientUtils.resolve(ClientUtils.java:110)
at org.apache.kafka.clients.ClusterConnectionStates$NodeConnectionState.currentAddress(ClusterConnectionStates.java:403)
at org.apache.kafka.clients.ClusterConnectionStates$NodeConnectionState.access$200(ClusterConnectionStates.java:363)
at org.apache.kafka.clients.ClusterConnectionStates.currentAddress(ClusterConnectionStates.java:151)
at org.apache.kafka.clients.NetworkClient.initiateConnect(NetworkClient.java:962)
at org.apache.kafka.clients.NetworkClient.ready(NetworkClient.java:294)
at org.apache.kafka.clients.producer.internals.Sender.sendProducerData(Sender.java:350)
at org.apache.kafka.clients.producer.internals.Sender.runOnce(Sender.java:323)
at org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:239)
at java.lang.Thread.run(Thread.java:745)
10:52:12.666 [kafka-producer-network-thread | client1] DEBUG org.apache.kafka.clients.NetworkClient - [Producer clientId=client1] Give up sending metadata request since no node is available

本质原因是kafka配置文件server.properites中默认监听hostname：

# Hostname and port the broker will advertise to producers and consumers. If not set, 
# it uses the value for "listeners" if configured.  Otherwise, it will use the value
# returned from java.net.InetAddress.getCanonicalHostName().
#advertised.listeners=PLAINTEXT://your.host.name:9092 
#advertised.listeners=PLAINTEXT://8.88.88.88:9092

两种解决方案

1.修改配置文件，改为监听ip，将 advertised.listeners 中的your.host.name 改为服务器的IP地址即可：

#advertised.listeners=PLAINTEXT://your.host.name:9092 
advertised.listeners=PLAINTEXT://8.88.88.88:9092

2.修改本机的host文件，在host文件中添加如下信息：

8.88.88.88 aaaa-9930

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