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From "Leting Wu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAHOUT-1034) ERROR in Navie Bayes Training(update: seqdirectory does not give output)
Date Thu, 12 Jul 2012 00:31:35 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-1034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13412414#comment-13412414
] 

Leting Wu commented on MAHOUT-1034:
-----------------------------------

Hi, jayghost. Have you tried it out?
I have figured it out.
On a single node machine, you need to force Mahout to run on local by setting MAHOUT_LOCAL
= TRUE in command line.
On a cluster, you should get through without problem.
The hadoop version actually does not matter. I tried 1.0.3 with Mahout 0.6. It just works
on clusters. I guess the default setting is trying to get configuration from Hadoop to run
on cluster.
Case closed. 
                
> ERROR in Navie Bayes Training(update: seqdirectory does not give output)
> ------------------------------------------------------------------------
>
>                 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
>            Assignee: Robin Anil
>
> 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}

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