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https://issues.apache.org/jira/browse/MAHOUT-1693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14504311#comment-14504311
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Andrew Palumbo commented on MAHOUT-1693:
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Pushed a quick fix to master which will print only the class name
{{o.a.m.FunctionalMatrixView}} when {{.toString()}} is called by the
{{spark-shell}} as the result of creating the {{FunctionalMatrixView}}.
leaving this opened because i am still concerned about the memory issue:
bq.The question is why do we need so much memory? A 5000x5000 matrix of doubles
should only take up ~200MB of space?"
> FunctionalMatrixView materializes row vectors in scala shell
> ------------------------------------------------------------
>
> Key: MAHOUT-1693
> URL: https://issues.apache.org/jira/browse/MAHOUT-1693
> Project: Mahout
> Issue Type: Bug
> Components: Mahout spark shell, Math
> Affects Versions: 0.10.0
> Reporter: Suneel Marthi
> Assignee: Andrew Palumbo
> Priority: Blocker
> Fix For: 0.10.1
>
>
> FunctionalMatrixView materializes row vectors in scala shell.
> Problem first reported by a user Michael Alton, Intel:
> "When I first tried to make a large matrix, I got an out of Java heap space
> error. I increased the memory incrementally until I got it to work. “export
> MAHOUT_HEAPSIZE=8000” didn’t work, but “export MAHOUT_HEAPSIZE=64000” did.
> The question is why do we need so much memory? A 5000x5000 matrix of doubles
> should only take up ~200MB of space?"
> Problem has been narrowed down to not override toString() method in
> FunctionalMatrixView which causes it to materialize all of the row vectors
> when run in Mahout Spark Shell.
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