kafka发送数据报错： Error connecting to node xxxxx:9092 (id: 1 rack: null)java.net.UnknownHostExceptio

 [kafka-producer-network-thread | producer-1] WARN  org.apache.kafka.clients.networkClient - [Producer clientId=producer-1] Error connecting to node xxxxx:9092 (id: 1 rack: null)java.net.UnknownHostException: xxxxx    at java.base/java.net.InetAddress$CachedAddresses.get(InetAddress.java:797)    at java.base/java.net.InetAddress.getAllByName0(InetAddress.java:1519)    at java.base/java.net.InetAddress.getAllByName(InetAddress.java:1378)    at java.base/java.net.InetAddress.getAllByName(InetAddress.java:1306)    at org.apache.kafka.clients.DefaultHostResolver.resolve(DefaultHostResolver.java:27)    at org.apache.kafka.clients.ClientUtils.resolve(ClientUtils.java:111)    at org.apache.kafka.clients.ClusterConnectionStates$NodeConnectionState.currentAddress(ClusterConnectionStates.java:512)    at org.apache.kafka.clients.ClusterConnectionStates$NodeConnectionState.access$200(ClusterConnectionStates.java:466)    at org.apache.kafka.clients.ClusterConnectionStates.currentAddress(ClusterConnectionStates.java:172)    at org.apache.kafka.clients.NetworkClient.initiateConnect(NetworkClient.java:985)    at org.apache.kafka.clients.NetworkClient.ready(NetworkClient.java:311)    at org.apache.kafka.clients.producer.internals.Sender.sendProducerData(Sender.java:353)    at org.apache.kafka.clients.producer.internals.Sender.runOnce(Sender.java:326)    at org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:242)    at java.base/java.lang.Thread.run(Thread.java:829)

error日志：

[kafka-producer-network-thread | producer-1] ERROR org.apache.kafka.clients.producer.internals.Sender - [Producer clientId=producer-1] Uncaught error in kafka producer I/O thread: java.lang.IllegalStateException: No entry found for connection 1    at org.apache.kafka.clients.ClusterConnectionStates.nodeState(ClusterConnectionStates.java:330)    at org.apache.kafka.clients.ClusterConnectionStates.disconnected(ClusterConnectionStates.java:134)    at org.apache.kafka.clients.NetworkClient.initiateConnect(NetworkClient.java:921)    at org.apache.kafka.clients.NetworkClient.access$700(NetworkClient.java:67)    at org.apache.kafka.clients.NetworkClient$DefaultMetadataUpdater.maybeUpdate(NetworkClient.java:1086)    at org.apache.kafka.clients.NetworkClient$DefaultMetadataUpdater.maybeUpdate(NetworkClient.java:971)    at org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:533)    at org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:309)    at org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:233)    at java.base/java.lang.Thread.run(Thread.java:829) 

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://192.34.12.12:9092

两种解决方案

修改kafka服务的配置文件，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://192.34.12.12:9092

修改producer客户端所在的电脑的host文件，在host文件中添加如下信息：

192.34.12.12     xxxxx

来源地址：https://blog.csdn.net/weixin_40816738/article/details/131009747