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https://issues.apache.org/jira/browse/MAHOUT-743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13055359#comment-13055359
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Sean Owen commented on MAHOUT-743:
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The fixed seed is not 0. You correctly describe the behavior; is there a
concrete problem that it solves? In general you don't want to write code with
fixed seeds. Nevertheless I think it's fine to change the behavior, yes.
> Allow use of random seeds during unit tests
> -------------------------------------------
>
> Key: MAHOUT-743
> URL: https://issues.apache.org/jira/browse/MAHOUT-743
> Project: Mahout
> Issue Type: Improvement
> Reporter: Lance Norskog
> Attachments: MAHOUT-743.patch, RandomWrapper.patch
>
>
> The RandomUtils package has a trick for running unit tests repeatably. All
> random generators created with RandomUtils.getRandom() are started with seed
> 0. Unfortunately, all random generators started with
> RandomUtils.getRandom(seed) effectively run from a seed of 0. Thus, code
> which deliberately creates Random objects with seeds does not work correctly
> under unit tests.
> The problem is that the logic in RandomWrapper tests for unit test mode and
> settable seed mode in the wrong order.
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