【问题描述】：
[root@hadoop1 flink-1.10.1]# bin/flink run examples/streaming/SocketWindowWordCount.jar --port 9000
Job has been submitted with JobID 2dd7501cfe08c345cd0346762d4f6540
------------------------------------------------------------
The program finished with the following exception:
org.apache.flink.client.program.ProgramInvocationException: The main method caused an error: org.apache.flink.client.program.ProgramInvocationException: Job failed (JobID: 2dd7501cfe08c345cd0346762d4f6540)
at org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:335)
at org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:205)
Caused by: org.apache.flink.runtime.client.JobExecutionException: Job execution failed.
at org.apache.flink.runtime.jobmaster.JobResult.toJobExecutionResult(JobResult.java:147)
at org.apache.flink.client.deployment.ClusterClientJobClientAdapter.lambda$null$6(ClusterClientJobClientAdapter.java:110)
... 19 more
Caused by: java.net.ConnectException: 拒绝连接 (Connection refused)
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
【问题解决方案】根据别人的博客搭建 Flink1.0时出现如上问题，原因是没有指定 --hostname 导致如上问题，解决方法如下。
[root@hadoop1 flink-1.10.1]# bin/flink run examples/streaming/SocketWindowWordCount.jar --hostname hadoop1 --port 9000