Hi guys, i'm trying to use DistributedSVDRecommender found at
https://issues.apache.org/jira/browse/MAHOUT-371
I'm using that in an ec2 cluster with a 1mln ratings txt file from Movielens,
but after 2 jobs execution, i receive this error...can anyone explain what
about is? Thanks !!!
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.math.hadoop.decomposer.DistributedLanczosSolver.run(DistributedLanczosSolver.java:85)
at
org.apache.mahout.math.hadoop.decomposer.DistributedLanczosSolver$DistributedLanczosSolverJob.run(DistributedLanczosSolver.java:252)
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.svd.DistributedSVDItemRecommenderJob.run(DistributedSVDItemRecommenderJob.java:101)
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.svd.DistributedSVDItemRecommenderJob.main(DistributedSVDItemRecommenderJob.java:134)
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:186)
