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https://issues.apache.org/jira/browse/HADOOP-5079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12672157#action_12672157
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stack commented on HADOOP-5079:
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I took a look at the patch and confirmed Math.abs(Integer.MIN_VALUE is negative.
> 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
> Assignee: Jonathan Ellis
> Fix For: 0.20.0
>
> Attachments: hadoop-core-hash-2.patch, 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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