Hadoop 客户端问题

错误：

log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Exception in thread "main" java.net.ConnectException: Call From DESKTOP-PU0J6PO/192.168.32.1 to s101:8020 failed on connection exception: java.net.ConnectException: Connection refused: no further information; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused
 at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
 at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
 at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
 at java.lang.reflect.Constructor.newInstance(Unknown Source)
 at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:792)
 at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:732)
 at org.apache.hadoop.ipc.Client.call(Client.java:1479)
 at org.apache.hadoop.ipc.Client.call(Client.java:1412)
 at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:229)
 at com.sun.proxy.$Proxy9.getFileInfo(Unknown Source)
 at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getFileInfo(ClientNamenodeProtocolTranslatorPB.java:771)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
 at java.lang.reflect.Method.invoke(Unknown Source)
 at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:191)
 at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)
 at com.sun.proxy.$Proxy10.getFileInfo(Unknown Source)
 at org.apache.hadoop.hdfs.DFSClient.getFileInfo(DFSClient.java:2108)
 at org.apache.hadoop.hdfs.DistributedFileSystem$22.doCall(DistributedFileSystem.java:1305)
 at org.apache.hadoop.hdfs.DistributedFileSystem$22.doCall(DistributedFileSystem.java:1301)
 at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
 at org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:1301)
 at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:1424)
 at org.apache.hadoop.fs.FileUtil.checkDest(FileUtil.java:496)
 at org.apache.hadoop.fs.FileUtil.copy(FileUtil.java:348)
 at org.apache.hadoop.fs.FileUtil.copy(FileUtil.java:338)
 at org.apache.hadoop.fs.FileSystem.copyFromLocalFile(FileSystem.java:1965)
 at org.apache.hadoop.fs.FileSystem.copyFromLocalFile(FileSystem.java:1933)
 at org.apache.hadoop.fs.FileSystem.copyFromLocalFile(FileSystem.java:1898)
 at big_demo1.FS_demo.main(FS_demo.java:15)
Caused by: java.net.ConnectException: Connection refused: no further information
 at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
 at sun.nio.ch.SocketChannelImpl.finishConnect(Unknown Source)
 at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
 at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:531)
 at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:495)
 at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:614)
 at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:712)
 at org.apache.hadoop.ipc.Client$Connection.access$2900(Client.java:375)
 at org.apache.hadoop.ipc.Client.getConnection(Client.java:1528)

错误原因：

端口啊！！！！！！！！！