[jira] [Work started] (MAHOUT-1251) Optimize MinHashMapper

["Sebastian Schelter (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAHOUT-1251?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on MAHOUT-1251 started by Sebastian Schelter.

> Optimize MinHashMapper
> ----------------------
>
>                 Key: MAHOUT-1251
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1251
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Clustering
>            Reporter: Sebastian Schelter
>            Assignee: Sebastian Schelter
>             Fix For: 0.8
>
>
> Remove unnecessary actions from MinHashMapper:
> It does a unnecessary string comparison per non-zero element of each input vector and it unnecessarily clones the input vector for each keyGroup

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