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Posted to dev@mahout.apache.org by "Lance Norskog (JIRA)" <ji...@apache.org> on 2011/06/27 08:04:47 UTC

[jira] [Updated] (MAHOUT-743) Allow use of random seeds during unit tests

     [ https://issues.apache.org/jira/browse/MAHOUT-743?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lance Norskog updated MAHOUT-743:
---------------------------------

    Attachment: RandomWrapper.patch

> 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: 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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