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