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https://issues.apache.org/jira/browse/MAHOUT-1071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13459446#comment-13459446
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Sean Owen commented on MAHOUT-1071:
-----------------------------------
Correct. If it were made compatible with 0.23, it would not be compatible with
0.20/1.0. It's not nearly possible to abandon that now. The 0.23/2.0 branch is
"alpha"; 0.20/1.0 is stable.
> 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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