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https://issues.apache.org/jira/browse/MAHOUT-1352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13820476#comment-13820476
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Pat Ferrel commented on MAHOUT-1352:
------------------------------------
Sebastian, does mahout now require hadoop 1.x? When I build the solr
recommender is get an error running the test with the following, which I think
may just be newer than my hadoop 0.20.205? :
Exception in thread "main" java.lang.NoClassDefFoundError:
org/apache/hadoop/mapreduce/lib/input/MultipleInputs
at
org.apache.mahout.cf.taste.hadoop.item.RecommenderJob.run(RecommenderJob.java:221)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at
finderbots.recommenders.hadoop.RecommenderUpdateJob.run(RecommenderUpdateJob.java:120)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at
finderbots.recommenders.hadoop.RecommenderUpdateJob.main(RecommenderUpdateJob.java:266)
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:156)
Caused by: java.lang.ClassNotFoundException:
org.apache.hadoop.mapreduce.lib.input.MultipleInputs
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
... 10 more
Maclaurin:scripts pat$
> Option to change RecommenderJob output format
> ---------------------------------------------
>
> Key: MAHOUT-1352
> URL: https://issues.apache.org/jira/browse/MAHOUT-1352
> Project: Mahout
> Issue Type: New Feature
> Components: Collaborative Filtering
> Affects Versions: 0.9
> Reporter: Pat Ferrel
> Assignee: Sebastian Schelter
> Fix For: 0.9
>
>
> Can we add an option to output a SequenceFile? I hard coded it to allow the
> Solr-recommender to work with the output file but it is probably best put in
> an option.
> //extract out the recommendations
> Job aggregateAndRecommend = prepareJob(
> new Path(aggregateAndRecommendInput), outputPath,
> SequenceFileInputFormat.class,
> PartialMultiplyMapper.class, VarLongWritable.class,
> PrefAndSimilarityColumnWritable.class,
> AggregateAndRecommendReducer.class, VarLongWritable.class,
> RecommendedItemsWritable.class,
> SequenceFileOutputFormat.class); <-- text format in Mahout trunk
> Should be able to choose format class from the params.
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