Hadoop in Windows - hadoop

Question

I'm trying to run the sample word count program for Hadoop in Windows thru Cygwin. I've installed Hadoop and Cygwin.
I run the wordcount program using this statment:
$ bin/hadoop jar hadoop-examples-1.0.1.jar wordcount input output
I'm getting the following error:
12/05/08 23:05:35 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
12/05/08 23:05:35 ERROR security.UserGroupInformation: PriviledgedActionException as:suresh cause:java.io.IOException: Failed to set permissions of path: \tmp\hadoop-suresh\mapred\staging\suresh1005684431\.staging to 0700
java.io.IOException: Failed to set permissions of path: \tmp\hadoop-suresh\mapred\staging\suresh1005684431\.staging to 0700
at org.apache.hadoop.fs.FileUtil.checkReturnValue(FileUtil.java:682)
at org.apache.hadoop.fs.FileUtil.setPermission(FileUtil.java:655)
at org.apache.hadoop.fs.RawLocalFileSystem.setPermission(RawLocalFileSystem.java:509)
at org.apache.hadoop.fs.RawLocalFileSystem.mkdirs(RawLocalFileSystem.java:344)
at org.apache.hadoop.fs.FilterFileSystem.mkdirs(FilterFileSystem.java:189)
at org.apache.hadoop.mapreduce.JobSubmissionFiles.getStagingDir(JobSubmissionFiles.java:116)
at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:856)
at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:850)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1093)
at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:850)
at org.apache.hadoop.mapreduce.Job.submit(Job.java:500)
at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:530)
at org.apache.hadoop.examples.WordCount.main(WordCount.java:67)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:68)
at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:139)
at org.apache.hadoop.examples.ExampleDriver.main(ExampleDriver.java:64)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.apache.hadoop.util.RunJar.main(RunJar.java:156)
I've set the Cygwin bin path in path variable. Any help is appreciated.

Answer 1

This is a known issue with some versions of Hadoop (see https://issues.apache.org/jira/browse/HADOOP-7682 for the full discussion).
I had this problem with version 1.0.2, so I tried various other versions.
In the end I got it to work by going back to version 0.22.0
If you go back to version 0.22.0 you will need to make a couple of changes to the bin/hadoop-config.sh script:
Change the line that sets up HADOOP_MAPRED_HOME to point the mapreduce directory instead of the mapred directory.
Comment out all the code that sets the java.library.path for a native hadoop install.

Answer 2

You should look at hadoop services for windows - a version of hadoop that was ported to windows.
currently it's in beta, but it's supposed to be released soon.

Answer 3

I've managed to get this working to the point where jobs are dispatched, tasks executed, and results compiled.
en.wikisource.org/wiki/User:Fkorning/Code/Hadoop-on-Cygwin