hadoop-hdfs-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Jeff Zhang <zjf...@gmail.com>
Subject Re: Accessing Hadoop DFS for Data Storage and Retrieval Using Java
Date Wed, 10 Mar 2010 13:10:26 GMT
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 <maalvarez@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:zjffdu@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 <maalvarez@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: maalvarez@us.es
>
>
>
>
>
>
> --
> Best Regards
>
> Jeff Zhang
>



-- 
Best Regards

Jeff Zhang

Mime
View raw message