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https://issues.apache.org/jira/browse/MAHOUT-784?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Sean Owen resolved MAHOUT-784.
------------------------------
Resolution: Fixed
Fix Version/s: 0.7
Assignee: Sean Owen (was: Robin Anil)
> 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: Sean Owen
> Fix For: 0.7
>
> Attachments: MAHOUT-784.patch, MAHOUT-784.patch
>
>
> 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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