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https://issues.apache.org/jira/browse/MAHOUT-784?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Sean Owen updated MAHOUT-784:
-----------------------------
Assignee: Robin Anil
I think this is a duplicate of other similar issues. Can you please try this
again with the latest code from Subversion rather than 0.5? Robin, it would
also be worth you looking at the wiki to confirm the instructions remain
correct.
> Exception at 20 Newsgroups examples
> -----------------------------------
>
> Key: MAHOUT-784
> URL: https://issues.apache.org/jira/browse/MAHOUT-784
> Project: Mahout
> Issue Type: Bug
> Components: Classification
> Environment: Ubuntu 11.04 / Hadoop 0.20.2 / Maven 3.0.3 /
> mahout-distribution-0.5
> Reporter: patrick.J
> Assignee: Robin Anil
>
> somebody may help,
> I run"Twenty Newsgroups Classification Example"(from
> https://cwiki.apache.org/confluence/display/MAHOUT/Twenty+Newsgroups) step by
> step.And the Environment variables(HADOOP_HOME,MAHOUT_HOME,HADOOP_CONF_DIR)
> all set in ~/.bashrc.
> But when I going the step train the classifier on Hadoop, Exception was
> cast like:
> $> $MAHOUT_HOME/bin/mahout trainclassifier -i
> 20news-input/bayes-train-input -o newsmodel -type bayes -ng 3 -source
> hdfs:
> 11/08/13 09:37:54 INFO mapred.JobClient: map 0% reduce 0%
> 11/08/13 09:38:04 INFO mapred.JobClient: Task Id :
> attempt_201108130934_0001_m_000000_0, Status : FAILED
> java.lang.RuntimeException: Error in configuring object
> at
> org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:93)
> at
> org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:64)
> at
> org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:117)
> at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:354)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307)
> at org.apache.hadoop.mapred.Child.main(Child.java:170)
> Caused by: java.lang.reflect.InvocationTargetException
> 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.util.ReflectionUtils.setJobConf(ReflectionUtils.java:88)
> ... 5 more
> Caused by: java.lang.NoClassDefFoundError:
> org/apache/lucene/analysis/TokenStream
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:247)
> at
> org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:762)
> at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:807)
> at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:833)
> at org.apache.hadoop.mapred.JobConf.getMapperClass(JobConf.java:772)
> at org.apache.hadoop.mapred.MapRunner.configure(MapRunner.java:34)
> ... 10 more
> Caused by: java.lang.ClassNotFoundException:
> org.apache.lucene.analysis.TokenStream
> 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)
> ... 17 more
> What happened? I just walked through the tutorials.......
>
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