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  1. Mahout
  2. MAHOUT-461

DistributedLanczosSolver doesn't check/validate output dir

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Details

    • Bug
    • Status: Closed
    • Minor
    • Resolution: Fixed
    • None
    • 0.4
    • Math
    • None

    Description

      I ran /mahout svd -Dmapred.input.dir=/tmp/solr-clust-n2/part-out.vec --tempDir /tmp/solr-clust-n2/svdTemp --rank 200 --numCols 62072 --numRows 130103

      and got

      INFO: Persisting 200 eigenVectors and eigenValues to: null
      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.serializeOutput(DistributedLanczosSolver.java:110)
      at org.apache.mahout.math.hadoop.decomposer.DistributedLanczosSolver.run(DistributedLanczosSolver.java:97)
      at org.apache.mahout.math.hadoop.decomposer.DistributedLanczosSolver.run(DistributedLanczosSolver.java:76)
      at org.apache.mahout.math.hadoop.decomposer.DistributedLanczosSolver$DistributedLanczosSolverJob.run(DistributedLanczosSolver.java:166)
      at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
      at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
      at org.apache.mahout.math.hadoop.decomposer.DistributedLanczosSolver.main(DistributedLanczosSolver.java:172)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:597)
      at org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:68)
      at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:139)
      at org.apache.mahout.driver.MahoutDriver.main(MahoutDriver.java:175)

      The solver doesn't ask for nor require the output value and it isn't documented either.

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            gsingers Grant Ingersoll
            gsingers Grant Ingersoll
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              Created:
              Updated:
              Resolved:

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