This job is not parsing command-line arguments like --input, it seems, but looking for the standard Hadoop params. The example in the wiki looks correct in that it is consistent with this. You should not need to modify the code or hard-code a value.
However I do think this is an example of some lack of standardization across the various jobs, which contributes to user confusion indeed. 2011/4/16 Julián Limón Núñez <[email protected]>: > Hello all, > > I hope you guys can shed some light here. I've been trying to use the > command line to convert a seq2sparse-generated vector into a matrix form > that is a SequenceFile<IntWritable,VectorWritable> and a > SequenceFile<IntWritable,Text> as suggested in > https://cwiki.apache.org/MAHOUT/dimensional-reduction.html and > http://search.lucidimagination.com/search/document/748181681ae5238b/need_a_little_help_with_using_svd#994da1aa86154c12 > > However, I'm getting the following error: > > bin/mahout rowid --input > /home/julian/Documents/code/bb/test6/vectors/tfidf-vectors/part-r-00000 > --output /home/julian/Documents/code/bb/test6/matrix/ > no HADOOP_HOME set, running locally > 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.utils.vectors.RowIdJob.run(RowIdJob.java:41) > at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65) > at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79) > at org.apache.mahout.utils.vectors.RowIdJob.main(RowIdJob.java:79) > 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.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:68) > at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:139) > at org.apache.mahout.driver.MahoutDriver.main(MahoutDriver.java:184) > > I've already tried to change "input" and "output" for "mapred.input.dir" and > "mapred.output.dir" to no avail. Any hints on what may be causing the error? > Alternatively, a pointer to the classes I could use to achieve the same > result would also help. > > Thanks a lot, > > Julian >
