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https://issues.apache.org/jira/browse/MAHOUT-35?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved MAHOUT-35.
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       Resolution: Fixed
    Fix Version/s: 0.2

Looks like this was long since fixed -- I see reuse of Element in the code 
already.

> Benchmark performance of Vector.iterator() when reusing Element instances.
> --------------------------------------------------------------------------
>
>                 Key: MAHOUT-35
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-35
>             Project: Mahout
>          Issue Type: Task
>          Components: Matrix
>            Reporter: Karl Wettin
>            Assignee: Karl Wettin
>             Fix For: 0.2
>
>
> Currently a new instance of Vector.Element is created for each call to 
> iterator.next(). The JVM pools this but we can always help it out.
> See MAHOUT-34 comments.

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