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https://issues.apache.org/jira/browse/MAHOUT-1039?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Sean Owen updated MAHOUT-1039:
------------------------------
Due Date: 4/Jul/12
Priority: Minor (was: Major)
Affects Version/s: 0.7
> org.apache.mahout.cf.taste.hadoop.pseudo.RecommenderJob throws
> IllegalArgumentException when no usersFile is supplied
> ---------------------------------------------------------------------------------------------------------------------
>
> Key: MAHOUT-1039
> URL: https://issues.apache.org/jira/browse/MAHOUT-1039
> Project: Mahout
> Issue Type: Bug
> Components: Collaborative Filtering
> Affects Versions: 0.7
> Reporter: Dan Cartoon
> Assignee: Sean Owen
> Priority: Minor
> Fix For: 0.8
>
> Attachments: MAHOUT-1039.diff
>
>
> When trying to run the pseudo.RecommenderJob without a usersFile, there is an
> IllegalArgumentException:
> Exception in thread "main" java.lang.IllegalArgumentException: Can not create
> a Path from a null string
> at org.apache.hadoop.fs.Path.checkPathArg(Path.java:78)
> at org.apache.hadoop.fs.Path.<init>(Path.java:90)
> at
> org.apache.mahout.cf.taste.hadoop.pseudo.RecommenderJob.run(RecommenderJob.java:122)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
> at
> org.apache.mahout.cf.taste.hadoop.pseudo.RecommenderJob.main(RecommenderJob.java:148)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:601)
> at org.apache.hadoop.util.RunJar.main(RunJar.java:156)
> In addition, providing a usersFile does not appear to cause any filtering to
> occur. This can be reproduced running the pseudo.RecommenderJob without a
> userFile and some basic preferences(I'm happy to provide more specifics here
> if necessary)
>
> It looks like we're taking the wrong action based on this check at
> RecommenderJob.java:122
> Path usersFile = hasOption("usersFile") ? inputFile : new
> Path(getOption("usersFile"));
> If the usersFile option has been specified, it seems like we should be using
> that, rather than the inputFile, and vice versa.
> I have attached attached a patch, runnable from trunk that swaps the action
> on line 122. This appears to fix the issue.
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