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From "Isabel Drost (JIRA)" <>
Subject [jira] Assigned: (MAHOUT-11) Static fields used throughout clustering code (Canopy, K-Means).
Date Thu, 10 Dec 2009 09:52:18 GMT


Isabel Drost reassigned MAHOUT-11:

    Assignee: Isabel Drost

> Static fields used throughout clustering code (Canopy, K-Means).
> ----------------------------------------------------------------
>                 Key: MAHOUT-11
>                 URL:
>             Project: Mahout
>          Issue Type: Bug
>          Components: Clustering
>    Affects Versions: 0.1
>            Reporter: Dawid Weiss
>            Assignee: Isabel Drost
>             Fix For: 0.3
>         Attachments: MAHOUT-11-all-cleanup-20091128.patch, MAHOUT-11-kmeans-cleanup.patch,
MAHOUT-11-RandomSeedGenerator.patch, MAHOUT-11.patch
> I file this as a bug, even though I'm not 100% sure it is one. In the currect code the
information is exchanged via static fields (for example, distance measure and thresholds for
Canopies are static field). Is it always true in Hadoop that one job runs inside one JVM with
exclusive access? I haven't seen it anywhere in Hadoop documentation and my impression was
that everything uses JobConf to pass configuration to jobs, but jobs are configured on a per-object
basis (a job is an object, a mapper is an object and everything else is basically an object).
> If it's possible for two jobs to run in parallel inside one JVM then this is a limitation
and bug in our code that needs to be addressed.

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