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Posted to common-dev@hadoop.apache.org by "Jonathan Ellis (JIRA)" <ji...@apache.org> on 2009/01/19 22:48:59 UTC

[jira] Updated: (HADOOP-5079) HashFunction inadvertently destroys some randomness

     [ https://issues.apache.org/jira/browse/HADOOP-5079?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Ellis updated HADOOP-5079:
-----------------------------------

    Attachment: hadoop-core-hash.patch

>  HashFunction inadvertently destroys some randomness
> ----------------------------------------------------
>
>                 Key: HADOOP-5079
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5079
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: util
>            Reporter: Jonathan Ellis
>         Attachments: hadoop-core-hash.patch
>
>
> HashFunction.hash restricts initval for the next hash to the [0, maxValue) range of the hash indexes returned. This is suboptimal, particularly for larger nbHash and smaller maxValue.  Rather we should first set initval, then restrict the range for the result assignment.

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