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From "Deneche A. Hakim (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAHOUT-602) "Partial Implementation" throws exceptions
Date Fri, 04 Feb 2011 06:30:23 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12990465#comment-12990465
] 

Deneche A. Hakim commented on MAHOUT-602:
-----------------------------------------

When I first wrote this code (two years ago) I found that when running in 'local' mode Hadoop
doesn't launch more than one mapper even if the partition size should create many. And because
it's important for the code to know how many mappers did run in the first step, I made the
code check if it's in 'local' mode and assume that only 1 single mapper did run in that case.
But it looks like that now, even in 'local' mode, many mappers are actually launched.

> "Partial Implementation" throws exceptions
> ------------------------------------------
>
>                 Key: MAHOUT-602
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-602
>             Project: Mahout
>          Issue Type: Bug
>         Environment: Macos X
> java version "1.6.0_22"
> Java(TM) SE Runtime Environment (build 1.6.0_22-b04-307-10M3261)
> Java HotSpot(TM) 64-Bit Server VM (build 17.1-b03-307, mixed mode)
>            Reporter: Lance Norskog
>            Assignee: Deneche A. Hakim
>         Attachments: 10_hashCode.log, 10_toString.log, PartialImplementationBug1.patch,
partialImp_fullKDD_errors.log
>
>
> The "Partial Implementation" described on the wiki page [Partial Implementation|https://cwiki.apache.org/confluence/display/MAHOUT/Partial+Implementation]
fails with the given dataset and operations.

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