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Posted to dev@mahout.apache.org by "Dror Mizrachi (JIRA)" <ji...@apache.org> on 2012/09/20 10:27:07 UTC
[jira] [Commented] (MAHOUT-1071) Mahout-0.7 is not running on
Hadoop 0.23 CDH4-MR1
[ https://issues.apache.org/jira/browse/MAHOUT-1071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13459445#comment-13459445 ]
Dror Mizrachi commented on MAHOUT-1071:
---------------------------------------
The problem is that it not compatabile with Hadoop 0.23, while it's compatible with 0.20
> Mahout-0.7 is not running on Hadoop 0.23 CDH4-MR1
> -------------------------------------------------
>
> Key: MAHOUT-1071
> URL: https://issues.apache.org/jira/browse/MAHOUT-1071
> Project: Mahout
> Issue Type: Bug
> Environment: Hadoop-0.23 CDH4-MR1
> Reporter: Dror Mizrachi
> Priority: Critical
>
> Hi
> I'm using Mahout-0.7-job.jar on Hadoop-0.23(CDH4-MR1). I got the below exception.
> Note: org.apache.hadoop.mapreduce.JobContext is an Interface on 0.23 while it was class on 0.20.x
> It seems that Mahout-0.7 is still incompatible with Hadoop-0.23 related to this class/interface and maybe for other classes that have been changed in 0.23 vs. 0.20.x
> Please advice / fix is ASAP.
> Thanks in advance :-)
> Dror
> -------------------
> Exception in thread "main" java.lang.IncompatibleClassChangeError: Found interface org.apache.hadoop.mapreduce.JobContext, but class was expected
> at org.apache.mahout.common.HadoopUtil.getCustomJobName(HadoopUtil.java:166)
> at org.apache.mahout.common.AbstractJob.prepareJob(AbstractJob.java:579)
> at org.apache.mahout.cf.taste.hadoop.preparation.PreparePreferenceMatrixJob.run(PreparePreferenceMatrixJob.java:75)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
> at org.apache.mahout.cf.taste.hadoop.item.RecommenderJob.run(RecommenderJob.java:154)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
> ...
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