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Posted to dev@mahout.apache.org by "Sean Owen (JIRA)" <ji...@apache.org> on 2012/09/20 10:19:07 UTC
[jira] [Resolved] (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:all-tabpanel ]
Sean Owen resolved MAHOUT-1071.
-------------------------------
Resolution: Not A Problem
Yes, it's compatible with the 0.20 / 1.0 branch. You would have to recompile at least and maybe rewrite a few things to work with the newer versions.
> 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)
> at com.intel.cooccurence.BuildCoOccurenceMatrixJob.runRecommendationJob(BuildCoOccurenceMatrixJob.java:54)
> at com.intel.cooccurence.BuildCoOccurenceMatrixJob.run(BuildCoOccurenceMatrixJob.java:31)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
> at com.intel.algoritms.RecommendationAlgorithms.runAlgorithm(RecommendationAlgorithms.java:44)
> at com.intel.engines.RecommendationEngine.run(RecommendationEngine.java:39)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
> at com.intel.engines.RecommendationEngine.main(RecommendationEngine.java:17)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at org.apache.hadoop.util.RunJar.main(RunJar.java:208)
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