Please upgrade to Mahout version 0.9, as many things have been fixed since.
> On Nov 22, 2014, at 7:00 PM, Ashok Harnal <ashokhar...@gmail.com> wrote: > > I use mahout 0.7 installed in Cloudera. After creating user-feature and > item-feature matrix in hdfs, I run the following command: > > mahout recommendfactorized --input /user/ashokharnal/seqfiles > --userFeatures $res_out_file/U/ --itemFeatures $res_out_file/M/ > --numRecommendations 1 --output $reommendation --maxRating 1 > > After some time, I get the following error: > > : > : > 14/11/23 08:28:20 INFO mapred.LocalJobRunner: Map task executor complete. > 14/11/23 08:28:20 WARN mapred.LocalJobRunner: job_local954305987_0001 > java.lang.Exception: java.lang.RuntimeException: > java.lang.ClassCastException: org.apache.hadoop.io.Text cannot be cast to > org.apache.hadoop.io.IntWritable > at > org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:406) > Caused by: java.lang.RuntimeException: java.lang.ClassCastException: > org.apache.hadoop.io.Text cannot be cast to org.apache.hadoop.io.IntWritable > at > org.apache.hadoop.mapreduce.lib.map.MultithreadedMapper.run(MultithreadedMapper.java:151) > at > org.apache.mahout.cf.taste.hadoop.als.MultithreadedSharingMapper.run(MultithreadedSharingMapper.java:60) > at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:672) > at org.apache.hadoop.mapred.MapTask.run(MapTask.java:330) > at > org.apache.hadoop.mapred.LocalJobRunner$Job$MapTaskRunnable.run(LocalJobRunner.java:268) > at > java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) > at java.util.concurrent.FutureTask.run(FutureTask.java:262) > at > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) > at > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) > at java.lang.Thread.run(Thread.java:744) > Caused by: java.lang.ClassCastException: org.apache.hadoop.io.Text cannot > be cast to org.apache.hadoop.io.IntWritable > at > org.apache.mahout.cf.taste.hadoop.als.PredictionMapper.map(PredictionMapper.java:44) > at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:140) > at > org.apache.hadoop.mapreduce.lib.map.MultithreadedMapper$MapRunner.run(MultithreadedMapper.java:268) > > > Not sure what is wrong. > Request help. > > Ashok Kumar Harnal > > > > > -- > Visit my blog at: http://ashokharnal.wordpress.com/
