Flink入门示例报错1

运行Flink示例时,报错:

Exception in thread "main" org.apache.flink.runtime.client.JobExecutionException: Job execution failed.
	at org.apache.flink.runtime.jobmaster.JobResult.toJobExecutionResult(JobResult.java:146)
	at org.apache.flink.runtime.minicluster.MiniCluster.executeJobBlocking(MiniCluster.java:630)
	at org.apache.flink.streaming.api.environment.LocalStreamEnvironment.execute(LocalStreamEnvironment.java:123)
	at org.apache.flink.streaming.api.scala.StreamExecutionEnvironment.execute(StreamExecutionEnvironment.scala:654)
	at cn._51doit.flink.HelloWorld$.main(HelloWorld.scala:31)
	at cn._51doit.flink.HelloWorld.main(HelloWorld.scala)
Caused by: java.net.ConnectException: Connection refused: connect
	at java.net.DualStackPlainSocketImpl.connect0(Native Method)
	at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345)
	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
	at java.net.Socket.connect(Socket.java:589)
	at org.apache.flink.streaming.api.functions.source.SocketTextStreamFunction.run(SocketTextStreamFunction.java:96)
	at org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:94)
	at org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:58)
	at org.apache.flink.streaming.runtime.tasks.SourceStreamTask.run(SourceStreamTask.java:99)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:300)
	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:711)
	at java.lang.Thread.run(Thread.java:745)

原因分析:代码中使用了socket作为DataSource,如果socket监听的端口没有nc -lk 9999,就会报错

val inputStream: DataStream[String] = env.socketTextStream("192.168.2.10", 9999)

解决方案:在192.168.2.10机器上启动nc -lk 9999,解决!!!

[root@gogo ~]# nc -lk 9999
hello tom