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Sean Owen commented on MAHOUT-1034: ----------------------------------- 1.0.3 may work as it is from the same branch as 0.20.205, but I do not know for sure. I comment on that because your error indicates an IPC error. If Mahout integrates against a different version of Hadoop then the wire protocol may be incompatible. My guess is that you may make it work by changing the version of Hadoop that is used in Mahout to 1.0.3 and recompiling. If it compiles, chances are it will work. > ERROR in Navie Bayes Training(trainnb) > -------------------------------------- > > Key: MAHOUT-1034 > URL: https://issues.apache.org/jira/browse/MAHOUT-1034 > Project: Mahout > Issue Type: Bug > Components: Classification > Affects Versions: 0.7 > Environment: Ubuntu 11.04 > Reporter: Leting Wu > Priority: Critical > > When run either examples/classify-20newsgrouops.sh or ash-email-examples.sh, > trainnb always fails: > {noformat} > INFO mapred.JobClient: Task Id : attempt_201206281546_0003_m_000000_0, Status > : FAILED > java.lang.IllegalArgumentException > at > com.google.common.base.Preconditions.checkArgument(Preconditions.java:72) > at > org.apache.mahout.classifier.naivebayes.training.WeightsMapper.setup(WeightsMapper.java:42) > at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:142) > at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:647) > at org.apache.hadoop.mapred.MapTask.run(MapTask.java:323) > at org.apache.hadoop.mapred.Child$4.run(Child.java:270) > 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:1177) > at org.apache.hadoop.mapred.Child.main(Child.java:264) > {noformat} -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira