I have intalled Hadoop in CentOS (Linux) and the test code is running on Windows.
Do I need cygwin to run the test code? De: Jeff Zhang [mailto:zjf...@gmail.com] Enviado el: miércoles, 10 de marzo de 2010 14:10 Para: hdfs-user@hadoop.apache.org Asunto: Re: Accessing Hadoop DFS for Data Storage and Retrieval Using Java It seems you are running it in windows, then you should install cygwin, and add C:/cygwin/bin on the Path environment variable . 2010/3/10 Miguel Ángel Álvarez de la Concepción <maalva...@us.es> Thanks! Now, the error occurs after copying the remote file I uploaded before: java.io.IOException: Cannot run program "chmod": CreateProcess error=2, The system can’t find the specified file at java.lang.ProcessBuilder.start(ProcessBuilder.java:459) at org.apache.hadoop.util.Shell.runCommand(Shell.java:149) at org.apache.hadoop.util.Shell.run(Shell.java:134) at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:286) at org.apache.hadoop.util.Shell.execCommand(Shell.java:354) at org.apache.hadoop.util.Shell.execCommand(Shell.java:337) at org.apache.hadoop.fs.RawLocalFileSystem.execCommand(RawLocalFileSystem.java:481) at org.apache.hadoop.fs.RawLocalFileSystem.setPermission(RawLocalFileSystem.java:473) at org.apache.hadoop.fs.FilterFileSystem.setPermission(FilterFileSystem.java:280) at org.apache.hadoop.fs.ChecksumFileSystem.create(ChecksumFileSystem.java:372) at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:484) at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:465) at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:372) at org.apache.hadoop.fs.FileUtil.copy(FileUtil.java:208) at org.apache.hadoop.fs.FileUtil.copy(FileUtil.java:142) at org.apache.hadoop.fs.FileSystem.copyToLocalFile(FileSystem.java:1216) at org.apache.hadoop.fs.FileSystem.copyToLocalFile(FileSystem.java:1197) at hadoop.testHadoop.main(testHadoop.java:53) Caused by: java.io.IOException: CreateProcess error=2, The system can’t find the specified file at java.lang.ProcessImpl.create(Native Method) at java.lang.ProcessImpl.<init>(ProcessImpl.java:81) at java.lang.ProcessImpl.start(ProcessImpl.java:30) at java.lang.ProcessBuilder.start(ProcessBuilder.java:452) ... 17 more Thanks again for your help. De: Jeff Zhang [mailto:zjf...@gmail.com] Enviado el: martes, 09 de marzo de 2010 17:13 Para: hdfs-user@hadoop.apache.org Asunto: Re: Accessing Hadoop DFS for Data Storage and Retrieval Using Java add ugi configuration like this : conf.set("hadoop.job.ugi",your_hadoop_user_name+","+your_hadoop_group_name); 2010/3/9 Miguel Ángel Álvarez de la Concepción <maalva...@us.es> Hi, I tried to run the Java code and it doesn't work. I pasted the code below: public class testHadoop { public static final String DIR_HADOOP = "hdfs://my.machine.com"; public static final String PORT_HADOOP = "9000"; public static void main(String[] args) { Configuration config = new Configuration(); config.set("fs.default.name", DIR_HADOOP + ":" + PORT_HADOOP); try { FileSystem haddopFileSystem = FileSystem.get(config); String directory = "test"; Path hadoopDirectory = new Path(haddopFileSystem.getWorkingDirectory() + "/" + directory); haddopFileSystem.mkdirs(hadoopDirectory); Path sourceDirectory = new Path("C://Windows/media/ringout.wav"); haddopFileSystem.copyFromLocalFile(sourceDirectory, hadoopDirectory); Path sourceFile = new Path(haddopFileSystem.getWorkingDirectory() + "/test/ringout.wav"); Path targetDirectory = new Path("C://"); haddopFileSystem.copyToLocalFile(sourceFile, targetDirectory); haddopFileSystem.delete(hadoopDirectory, true); } catch(IOException ex) { Logger.getLogger(testHadoop.class.getName()).log(Level.SEVERE, null, ex); } } } The result of this code is an exception: org.apache.hadoop.security.AccessControlException: org.apache.hadoop.security.AccessControlException: Permission denied: user=varadero\miguelangel, access=WRITE, inode="tmp":root:supergroup:rwxr-xr-x at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:513) at org.apache.hadoop.ipc.RemoteException.instantiateException(RemoteException.java:96) at org.apache.hadoop.ipc.RemoteException.unwrapRemoteException(RemoteException.java:58) at org.apache.hadoop.hdfs.DFSClient.mkdirs(DFSClient.java:914) at org.apache.hadoop.hdfs.DistributedFileSystem.mkdirs(DistributedFileSystem.java:262) at org.apache.hadoop.fs.FileSystem.mkdirs(FileSystem.java:1120) at hadoop.testHadoop.main(testHadoop.java:37) Caused by: org.apache.hadoop.ipc.RemoteException: org.apache.hadoop.security.AccessControlException: Permission denied: user=varadero\miguelangel, access=WRITE, inode="tmp":root:supergroup:rwxr-xr-x at org.apache.hadoop.hdfs.server.namenode.PermissionChecker.check(PermissionChecker.java:176) at org.apache.hadoop.hdfs.server.namenode.PermissionChecker.check(PermissionChecker.java:157) at org.apache.hadoop.hdfs.server.namenode.PermissionChecker.checkPermission(PermissionChecker.java:105) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkPermission(FSNamesystem.java:4514) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.checkAncestorAccess(FSNamesystem.java:4484) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirsInternal(FSNamesystem.java:1766) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.mkdirs(FSNamesystem.java:1735) at org.apache.hadoop.hdfs.server.namenode.NameNode.mkdirs(NameNode.java:542) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:508) at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:959) at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:955) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:396) at org.apache.hadoop.ipc.Server$Handler.run(Server.java:953) at org.apache.hadoop.ipc.Client.call(Client.java:740) at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:220) at $Proxy0.mkdirs(Unknown Source) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:82) at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:59) at $Proxy0.mkdirs(Unknown Source) at org.apache.hadoop.hdfs.DFSClient.mkdirs(DFSClient.java:912) ... 3 more What's happend? Miguel Ángel Álvarez de la Concepción Departamento de Lenguajes y Sistemas Informáticos Escuela Técnica Superior de Ingeniería Informática Universidad de Sevilla Teléfono: 954.556.086 Email: maalva...@us.es -- Best Regards Jeff Zhang -- Best Regards Jeff Zhang
