https://community.cloudera.com/t5/Support-Questions/remote-access-to-clusters-through-hadoop-fs-ls/m-p/224425#M186289 <P>I have two clusters A(unsecure) and B(secure):</P><P>I try to list directories of the cluster A from the cluster B:</P><P>I did this:</P><PRE>cluster B, master node machine# hadoop fs -ls hdfs://Cluster A IP address of master node:8020/tmp/</PRE><P>I got this error :</P><PRE>18/02/26 12:54:23 WARN ipc.Client: Failed to connect to server: 10.166.54.12/10.166.54.12:8020: try once and fail. java.net.ConnectException: Connection refused at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717) 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$Connection.setupConnection(Client.java:650) at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:745) at org.apache.hadoop.ipc.Client$Connection.access$3200(Client.java:397) at org.apache.hadoop.ipc.Client.getConnection(Client.java:1618) at org.apache.hadoop.ipc.Client.call(Client.java:1449) at org.apache.hadoop.ipc.Client.call(Client.java:1396) at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:233) at com.sun.proxy.$Proxy10.getFileInfo(Unknown Source) at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getFileInfo(ClientNamenodeProtocolTranslatorPB.java:816) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:278) at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:194) at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:176) at com.sun.proxy.$Proxy11.getFileInfo(Unknown Source) at org.apache.hadoop.hdfs.DFSClient.getFileInfo(DFSClient.java:2158) at org.apache.hadoop.hdfs.DistributedFileSystem$25.doCall(DistributedFileSystem.java:1423) at org.apache.hadoop.hdfs.DistributedFileSystem$25.doCall(DistributedFileSystem.java:1419) at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81) at org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:1419) at org.apache.hadoop.fs.Globber.getFileStatus(Globber.java:57) at org.apache.hadoop.fs.Globber.glob(Globber.java:252) at org.apache.hadoop.fs.FileSystem.globStatus(FileSystem.java:1674) at org.apache.hadoop.fs.shell.PathData.expandAsGlob(PathData.java:326) at org.apache.hadoop.fs.shell.Command.expandArgument(Command.java:235) at org.apache.hadoop.fs.shell.Command.expandArguments(Command.java:218) at org.apache.hadoop.fs.shell.FsCommand.processRawArguments(FsCommand.java:103) at org.apache.hadoop.fs.shell.Command.run(Command.java:165) at org.apache.hadoop.fs.FsShell.run(FsShell.java:297) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:90) at org.apache.hadoop.fs.FsShell.main(FsShell.java:350) 18/02/26 12:54:23 WARN retry.RetryInvocationHandler: Exception while invoking ClientNamenodeProtocolTranslatorPB.getFileInfo over null. Not retrying because try once and fail. java.net.ConnectException: Call From slzuyd5hmn03.yres.ytech/10.166.60.143 to 10.166.54.12:8020 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: <A href="http://wiki.apache.org/hadoop/ConnectionRefused" target="_blank">http://wiki.apache.org/hadoop/ConnectionRefused</A></PRE> Mon, 26 Feb 2018 20:21:29 GMT sihi_yassine 2018-02-26T20:21:29Z