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From "Grant Ingersoll (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAHOUT-461) DistributedLanczosSolver doesn't check/validate output dir
Date Sun, 29 Aug 2010 11:59:52 GMT

     [ https://issues.apache.org/jira/browse/MAHOUT-461?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Grant Ingersoll updated MAHOUT-461:
-----------------------------------

        Status: Resolved  (was: Patch Available)
    Resolution: Fixed

> DistributedLanczosSolver doesn't check/validate output dir
> ----------------------------------------------------------
>
>                 Key: MAHOUT-461
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-461
>             Project: Mahout
>          Issue Type: Bug
>          Components: Math
>            Reporter: Grant Ingersoll
>            Assignee: Grant Ingersoll
>            Priority: Minor
>             Fix For: 0.4
>
>         Attachments: MAHOUT-461.patch
>
>
> 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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