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https://issues.apache.org/jira/browse/MAHOUT-461?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Grant Ingersoll updated MAHOUT-461:
-----------------------------------
Attachment: MAHOUT-461.patch
And the patch. I will update the docs when I commit.
> 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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