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From "Drew Farris (JIRA)" <>
Subject [jira] Updated: (MAHOUT-11) Static fields used throughout clustering code (Canopy, K-Means).
Date Sat, 28 Nov 2009 21:51:20 GMT


Drew Farris updated MAHOUT-11:

    Attachment: MAHOUT-11-all-cleanup-20091128.patch

MAHOUT-11-all-cleanup-20091128.patch eliminates the use of static fields for configuration
in the clustering code in all cases where it was present: canopy, kmeans, fuzzykmeans and
meanshift. It retains Isabel's original patch to the kmeans package, with the exception of
the items discussed previously, and adds similar changes to the other packages. It also includes
the fix to and unit test for RandomSeedGenerator previously included.

Applied against rev 883446, all unit tests are passing, and I've run the kmeans code on real
data. It would be really great if someone could double check the changes and comment.

> 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
>             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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