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https://issues.apache.org/jira/browse/MAHOUT-680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13037702#comment-13037702
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Elmer Garduno commented on MAHOUT-680:
--------------------------------------
I think this issue is causing us some problems when running mahout on a Hadoop
cluster.
In particular when running seq2sparse I get the following exception:
Error: java.lang.ClassNotFoundException:
org.apache.mahout.math.function.ObjectIntProcedure
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at
org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:943)
at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:994)
at
org.apache.hadoop.mapreduce.JobContext.getMapperClass(JobContext.java:212)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:601)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:322)
at org.apache.hadoop.mapred.Child$4.run(Child.java:268)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1115)
at org.apache.hadoop.mapred.Child.main(Child.java:262)
Commenting this line fixes the problem
export HADOOP_CLASSPATH=$MAHOUT_CONF_DIR:${HADOOP_CLASSPATH}:$CLASSPATH
The Mahout version we are using was compiled from
http://svn.apache.org/repos/asf/mahout/tags/mahout-0.5/
> Running the Hadoop script through bin/mahout to set up classpath
> ----------------------------------------------------------------
>
> Key: MAHOUT-680
> URL: https://issues.apache.org/jira/browse/MAHOUT-680
> Project: Mahout
> Issue Type: Improvement
> Affects Versions: 0.4
> Reporter: Frank Scholten
> Priority: Minor
> Fix For: 0.5
>
> Attachments: MAHOUT-680.patch, MAHOUT-680.patch
>
>
> Added a patch which allows you to run the $HADOOP_HOME/bin/hadoop command
> script through the bin/mahout script.
> This way the Mahout script adds the Mahout classes to the $HADOOP_CLASSPATH
> so you can view sequencefiles generated by Mahout jobs with
> bin/mahout hadoop fs -text <sequencefile>
> without having to specify Mahout classes manually or getting
> ClassNotFoundExceptions
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