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https://issues.apache.org/jira/browse/MAHOUT-476?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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leon lee resolved MAHOUT-476.
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Fix Version/s: 0.3
Resolution: Not A Problem
I found the reason why report error when running job.
somebody put a lucene 2.4 jar in the hadoop lib directory. jars in hadoop's
lib directory have higher priority in CLASSPATH. So when running mahout
example, it found the 2.4 lucene as its lib jar, not the higher version lucene
in machout's lib.
> bug when running
> org.apache.mahout.classifier.bayes.WikipediaDatasetCreatorDriver on hadoop
> -------------------------------------------------------------------------------------------
>
> Key: MAHOUT-476
> URL: https://issues.apache.org/jira/browse/MAHOUT-476
> Project: Mahout
> Issue Type: Bug
> Components: Classification
> Affects Versions: 0.3
> Environment: hadoop 0.20.2
> mahout-0.3
> ubuntu
> Reporter: leon lee
> Fix For: 0.3
>
>
> when I follow wiki instruction:
> https://cwiki.apache.org/MAHOUT/wikipedia-bayes-example.html
> (by the way, the bayes examples document in wiki need update to 0.3 )
> to run step 5:
> Create the countries based Split of wikipedia dataset.
> I use the following command:
> $HADOOP_HOME/bin/hadoop jar
> $MAHOUT_HOME/examples/target/mahout-examples-0.3.job
> org.apache.mahout.classifier.bayes.WikipediaDatasetCreatorDriver -i
> $MAHOUT_HOME/examples/work/wikipedia/chunks -o
> $MAHOUT_HOME/examples/work/wikipediainput -c
> $MAHOUT_HOME/examples/src/test/resources/country.txt
> and failed on hadoop.
> see hadoop log, it hint:
> Error:
> org.apache.lucene.wikipedia.analysis.WikipediaTokenizer.addAttribute(Ljava/lang/Class;)Lorg/apache/lucene/util/Attribute
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