● 開啟kafka生產者寫入資料時報錯 報錯如下：

[[email protected] bin]# ./kafka-console-producer.sh --broker-list 192.168.0.21:9092 --topic ws
[2018-10-19 10:47:42,502] WARN Property topic is not valid (kafka.utils.VerifiableProperties)
1
[2018-10-19 10:49:00,654] WARN Fetching topic metadata with correlation id 0 for topics [Set(ws)] from broker [id:0,host:192.168.0.21,port:9092] failed (kafka.client.ClientUtils$)
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$$doSend(SyncProducer.scala:72)
	at kafka.producer.SyncProducer.send(SyncProducer.scala:113)
	at kafka.client.ClientUtils$.fetchTopicMetadata(ClientUtils.scala:58)
	at kafka.producer.BrokerPartitionInfo.updateInfo(BrokerPartitionInfo.scala:82)
	at kafka.producer.async.DefaultEventHandler$$anonfun$handle$1.apply$mcV$sp(DefaultEventHandler.scala:67)
	at kafka.utils.Utils$.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:67)
	at kafka.producer.async.ProducerSendThread.tryToHandle(ProducerSendThread.scala:105)
	at kafka.producer.async.ProducerSendThread$$anonfun$processEvents$3.apply(ProducerSendThread.scala:88)
	at kafka.producer.async.ProducerSendThread$$anonfun$processEvents$3.apply(ProducerSendThread.scala:68)
	at scala.collection.immutable.Stream.foreach(Stream.scala:594)
	at kafka.producer.async.ProducerSendThread.processEvents(ProducerSendThread.scala:67)
	at kafka.producer.async.ProducerSendThread.run(ProducerSendThread.scala:45)
[2018-10-19 10:49:00,657] ERROR fetching topic metadata for topics [Set(ws)] from broker [ArrayBuffer(id:0,host:192.168.0.21,port:9092)] failed (kafka.utils.Utils$)
kafka.common.KafkaException: fetching topic metadata for topics [Set(ws)] from broker [ArrayBuffer(id:0,host:192.168.0.21,port:9092)] failed
	at kafka.client.ClientUtils$.fetchTopicMetadata(ClientUtils.scala:72)
	at kafka.producer.BrokerPartitionInfo.updateInfo(BrokerPartitionInfo.scala:82)
	at kafka.producer.async.DefaultEventHandler$$anonfun$handle$1.apply$mcV$sp(DefaultEventHandler.scala:67)
	at kafka.utils.Utils$.swallow(Utils.scala:172)
	at kafka.utils.Logging$class.swallowError(Logging.scala:106)
	at kafka.utils.Utils$.swallowError(Utils.scala:45)
	at kafka.producer.async.DefaultEventHandler.handle(DefaultEventHandler.scala:67)
	at kafka.producer.async.ProducerSendThread.tryToHandle(ProducerSendThread.scala:105)
	at kafka.producer.async.ProducerSendThread$$anonfun$processEvents$3.apply(ProducerSendThread.scala:88)
	at kafka.producer.async.ProducerSendThread$$anonfun$processEvents$3.apply(ProducerSendThread.scala:68)
	at scala.collection.immutable.Stream.foreach(Stream.scala:594)
	at kafka.producer.async.ProducerSendThread.processEvents(ProducerSendThread.scala:67)
	at kafka.producer.async.ProducerSendThread.run(ProducerSendThread.scala:45)
Caused by: java.nio.channels.ClosedChannelException
	at kafka.network.BlockingChannel.send(BlockingChannel.scala:100)
	at kafka.producer.SyncProducer.liftedTree1$1(SyncProducer.scala:73)
	at kafka.producer.SyncProducer.kafka$producer$SyncProducer$$doSend(SyncProducer.scala:72)
	at kafka.producer.SyncProducer.send(SyncProducer.scala:113)
	at kafka.client.ClientUtils$.fetchTopicMetadata(ClientUtils.scala:58)
	... 12 more

 

● 解決方法：

找到kafka配置server.properties檔案，
#修改host.name=真實ip
host.name=192.168.0.21
zookeeper.connect=192.168.0.21:2181