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https://issues.apache.org/jira/browse/MAHOUT-339?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12852948#action_12852948
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Jeff Eastman commented on MAHOUT-339:
-------------------------------------
Problem with example was introduced by a recent change to the
MeanShiftCanopyJob which added a preprocessing step to convert Vectors in the
input directory to canopies. This preprocessing was already being done in the
synthetic control job - which converts delimited text to canopies - so the
canopies could not be cast to vectors in the clustering job. I've added an
optional boolean inputIsClusters argument to the MeanShiftCanopyJob.runJob so
that the redundant conversion can be omitted if a preprocessing step has
already produced canopies. Running tests now. Will commit once they are done.
> Class Cast Exception Running Synthetic Control MeanShift Clustering Job
> -----------------------------------------------------------------------
>
> Key: MAHOUT-339
> URL: https://issues.apache.org/jira/browse/MAHOUT-339
> Project: Mahout
> Issue Type: Bug
> Components: Clustering
> Affects Versions: 0.3
> Reporter: Jeff Eastman
> Priority: Critical
> Fix For: 0.4
>
>
> Mar 17, 2010 2:15:00 PM org.apache.hadoop.mapred.LocalJobRunner$Job run
> WARNING: job_local_0002
> java.lang.ClassCastException:
> org.apache.mahout.clustering.meanshift.MeanShiftCanopy cannot be cast to
> org.apache.mahout.math.VectorWritable
> at
> org.apache.mahout.clustering.meanshift.MeanShiftCanopyCreatorMapper.map(MeanShiftCanopyCreatorMapper.java:1)
> at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:50)
> at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:358)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307)
> at
> org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:177)
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