kafka连接java.nio.channels.ClosedChannelException

描述：项目在正式环境运行后，报java.nio.channels.ClosedChannelException异常

2018-03-15 16:33:50,638-[Main] ERROR Thread-948 kafka.utils.Utils$ - fetching topic metadata for topics [Set(visitorgz)] from broker [ArrayBuffer(id:0,host:222.85.132.91,port:9
092)] failed
kafka.common.KafkaException: fetching topic metadata for topics [Set(visitorgz)] from broker [ArrayBuffer(id:0,host:222.85.132.91,port:9092)] failed
        at kafka.client.ClientUtils$.fetchTopicMetadata(ClientUtils.scala:72)
        at kafka.producer.BrokerPartitionInfo.updateInfo(BrokerPartitionInfo.scala:82)
        at kafka.producer.async.DefaultEventHandler$$anonfun$handle$2.apply$mcV$sp(DefaultEventHandler.scala:78)
        at kafka.utils.Utils$.swallow(Utils.scala:172)
        at kafka.utils.Logging$class.swallowError(Logging.scala:106)
        at kafka.utils.Utils$.swallowError(Utils.scala:45)
        at kafka.producer.async.DefaultEventHandler.handle(DefaultEventHandler.scala:78)
        at kafka.producer.Producer.send(Producer.scala:77)
        at kafka.javaapi.producer.Producer.send(Producer.scala:33)
        at com.gdhuihe.access.kafka.VisitorProducer.sendMsg(VisitorProducer.java:69)
        at com.gdhuihe.access.controller.app.AppDeviceController$5$2.run(AppDeviceController.java:474)
        at java.lang.Thread.run(Thread.java:748)
Caused by: java.nio.channels.ClosedChannelException
        at kafka.network.BlockingChannel.send(BlockingChannel.scala:100)
        at kafka.producer.SyncProducer.liftedTree1$1(SyncProducer.scala:73)
        at kafka.producer.SyncProducer.kafka$producer$SyncProducer$$doSend(SyncProducer.scala:72)
        at kafka.producer.SyncProducer.send(SyncProducer.scala:113)
        at kafka.client.ClientUtils$.fetchTopicMetadata(ClientUtils.scala:58)
        ... 11 more
解决方法：

查看日志，定位问题出现在哪里

less 命令从后向前查看 ctrl+b 翻屏 q 退出

重启卡夫卡测试：

 bin/kafka-server-start.sh config/server.properties &