程序运行时java.net.ConnectException: Connection refused;

来源：4-7 词频统计之自定义Driver类实现

KiritoH

2019-03-24

cause:java.net.ConnectException: Call From Kirito.local/10.37.129.2 to 192.168.0.233:8020 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
Exception in thread “main” java.net.ConnectException: Call From Kirito.local/10.37.129.2 to 192.168.0.233:8020 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:791)
at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:731)
at org.apache.hadoop.ipc.Client.call(Client.java:1508)
at org.apache.hadoop.ipc.Client.call(Client.java:1441)
at org.apache.hadoop.ipc.ProtobufRpcEngine $I n v o k e r . i n v o k e (P r o t o b u f R p c E n g i n e . j a v a : 230) a t c o m . s u n . p r o x y .$ Proxy10.getFileInfo(Unknown Source)
at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getFileInfo(ClientNamenodeProtocolTranslatorPB.java:788)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:258)
at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:104)
at com.sun.proxy.$Proxy11.getFileInfo(Unknown Source)
at org.apache.hadoop.hdfs.DFSClient.getFileInfo(DFSClient.java:2168)
at org.apache.hadoop.hdfs.DistributedFileSystem$20.doCall(DistributedFileSystem.java:1266)
at org.apache.hadoop.hdfs.DistributedFileSystem$20.doCall(DistributedFileSystem.java:1262)
at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
at org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:1262)
at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:1418)
at org.apache.hadoop.mapreduce.lib.output.FileOutputFormat.checkOutputSpecs(FileOutputFormat.java:145)
at org.apache.hadoop.mapreduce.JobSubmitter.checkSpecs(JobSubmitter.java:270)
at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:143)
at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1307)
at org.apache.hadoop.mapreduce.Job $10 . r u n (J o b . j a v a : 1304) a t j a v a . s e c u r i t y . A c c e s s C o n t r o l l e r . d o P r i v i l e g e d (N a t i v e M e t h o d) a t j a v a x . s e c u r i t y . a u t h . S u b j e c t . d o A s (S u b j e c t . j a v a : 422) a t o r g . a p a c h e . h a d o o p . s e c u r i t y . U s e r G r o u p I n f o r m a t i o n . d o A s (U s e r G r o u p I n f o r m a t i o n . j a v a : 1924) a t o r g . a p a c h e . h a d o o p . m a p r e d u c e . J o b . s u b m i t (J o b . j a v a : 1304) a t o r g . a p a c h e . h a d o o p . m a p r e d u c e . J o b . w a i t F o r C o m p l e t i o n (J o b . j a v a : 1325) a t c o m . y w w . b i g d a t a . m a p r e d u c e . G r o u p B y . m a i n (G r o u p B y . j a v a : 42) C a u s e d b y : j a v a . n e t . C o n n e c t E x c e p t i o n : C o n n e c t i o n r e f u s e d a t s u n . n i o . c h . S o c k e t C h a n n e l I m p l . c h e c k C o n n e c t (N a t i v e M e t h o d) a t s u n . n i o . c h . S o c k e t C h a n n e l I m p l . f i n i s h C o n n e c t (S o c k e t C h a n n e l I m p l . j a v a : 717) a t o r g . a p a c h e . h a d o o p . n e t . S o c k e t I O W i t h T i m e o u t . c o n n e c t (S o c k e t I O W i t h T i m e o u t . j a v a : 206) a t o r g . a p a c h e . h a d o o p . n e t . N e t U t i l s . c o n n e c t (N e t U t i l s . j a v a : 530) a t o r g . a p a c h e . h a d o o p . n e t . N e t U t i l s . c o n n e c t (N e t U t i l s . j a v a : 494) a t o r g . a p a c h e . h a d o o p . i p c . C l i e n t$ Connection.setupConnection(Client.java:648)
at org.apache.hadoop.ipc.Client $C o n n e c t i o n . s e t u p I O s t r e a m s (C l i e n t . j a v a : 744) a t o r g . a p a c h e . h a d o o p . i p c . C l i e n t$ Connection.access$3000(Client.java:396)
at org.apache.hadoop.ipc.Client.getConnection(Client.java:1557)
at org.apache.hadoop.ipc.Client.call(Client.java:1480)
… 28 more

** 百度了很久，一直没搞定。。。**

写回答

1回答

Michael_PK

2019-03-24

HDFS正常吗？看到连不上8020，就应该要想到HDFS

Michael_PK

weixin_慕的地9165759

.net.ConnectException: Call From Kirito.local/10.37.129.2 to 192.168.0.233:8020 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused明显hdfs连不上，先确保hdfs你的机器能用命令操作

2020-05-20

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