kafka Exception thrown when sending a message with key='null'

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关于一次部署kafka出现异常（key=’null’）的记录，环境为阿里云服务器
先贴异常：
org.springframework.kafka.support.LoggingProducerListener [76] - Exception thrown when sending a message with key=’null’ and payload=’2017-11-14 15:36:53|iZbp1115ogry6vyp418vplZ|192.168.3.1|{“token”:”708037c594e04850bfd48f82fa862dd…’ to topic
kafka启动日志报错如下

Could not initialize class kafka.network.RequestChannel

kafka我采用三节点部署，配置如下：

broker.id=0 # 1,2delete.topic.enable=trueauto.create.topics.enable=falselisteners=PLAINTEXT://192.168.4.1:9092advertised.listeners=PLAINTEXT://192.168.4.1:9092num.network.threads=3num.io.threads=6socket.send.buffer.bytes=102400socket.receive.buffer.bytes=102400socket.request.max.bytes=104857600log.dirs=/opt/kafka-logsnum.partitions=6num.recovery.threads.per.data.dir=1default.replication.factor=2offsets.topic.replication.factor=1transaction.state.log.replication.factor=1transaction.state.log.min.isr=1log.retention.hours=168log.segment.bytes=1073741824log.retention.check.interval.ms=300000zookeeper.connect=192.168.4.1:2181,192.168.4.2:2181,192.168.4.3:2181zookeeper.connection.timeout.ms=6000group.initial.rebalance.delay.ms=0

到生产环境总是有一台机网络有问题，经过查看日志，发现该台机没有做主机名ip映射，坑啊：
然后改/etc/hosts文件加上以下一段，一切正常，在此做一下记录：

127.0.0.1 iZbp1iazbfd949z016r62zZ

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