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From "Ted Dunning (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAHOUT-666) DistributedSparseMatrix should clean up after itself when doing times(Vector) and timesSquared(Vector)
Date Tue, 12 Apr 2011 17:05:06 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13018908#comment-13018908
] 

Ted Dunning commented on MAHOUT-666:
------------------------------------

{quote}
If you think it's worthwhile to just always clean up, I'll make the requisite changes and
send another patch.
{quote}
yes.  I think it is very worthwhile.

> DistributedSparseMatrix should clean up after itself when doing times(Vector) and timesSquared(Vector)
> ------------------------------------------------------------------------------------------------------
>
>                 Key: MAHOUT-666
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-666
>             Project: Mahout
>          Issue Type: Bug
>          Components: Math
>    Affects Versions: 0.5
>         Environment: Linux x86_64 2.6.18, Mac OS 10.6 64-bit, Hadoop 0.20.2, Java 1.6
>            Reporter: Jonathan Traupman
>            Assignee: Jake Mannix
>            Priority: Minor
>             Fix For: 0.5
>
>         Attachments: mahout-666.patch
>
>   Original Estimate: 4h
>  Remaining Estimate: 4h
>
> The directories created during the times() and timesSquared() methods in DistributedSparseMatrix
leave behind a lot of cruft. While the individual files are tagged with deleteOnExit, but
the directories are not. Also, but not deleting them until JVM exit, a job that does repeated
matrix/vector multiplies, like DistributedLanczosSolver, creates a lot of temp files that
stick around for the whole run, even though the results they contain are read once and then
never again. 
> Our cluster admins enforce both file count and size quotas, so since 5 temp files/directories
are created on each iteration of DistributedLanczosSolver, we're constantly bumping into the
quota with large SVDs. 

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