[jira] Updated: (MAHOUT-158) Replace all ID values with long

["Sean Owen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAHOUT-158?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Owen updated MAHOUT-158:
-----------------------------

    Attachment: MAHOUT-158.patch

Preliminary patch for review for anyone that is curious. Also epic -- core changes only in this one so far! In my realistic-ish test case, required heap size went down about 25% (less than expected...) and speed increased by about 30%.

> Replace all ID values with long
> -------------------------------
>
>                 Key: MAHOUT-158
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-158
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Clustering
>    Affects Versions: 0.2
>            Reporter: Sean Owen
>            Assignee: Sean Owen
>             Fix For: 0.2
>
>         Attachments: MAHOUT-158.patch
>
>
> As mentioned on mailing list, I am tracking this as a possible change for evaluation. The idea is to save more memory / CPU by avoiding the Object overhead of tens of millions of ID objects by using long IDs instead.

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