Dan Cartoon created MAHOUT-1039:
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Summary: 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
Reporter: Dan Cartoon
Assignee: Sean Owen
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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