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https://issues.apache.org/jira/browse/HDFS-288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12752110#action_12752110
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Hudson commented on HDFS-288:
-----------------------------
Integrated in Hadoop-Hdfs-trunk-Commit #16 (See
[http://hudson.zones.apache.org/hudson/job/Hadoop-Hdfs-trunk-Commit/16/])
. Redundant computation in hashCode() implementation. Contributed by Tsz Wo
(Nicholas), SZE.
> Redundant computation in hashCode() implemenation
> -------------------------------------------------
>
> Key: HDFS-288
> URL: https://issues.apache.org/jira/browse/HDFS-288
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Fix For: 0.21.0
>
> Attachments: h288_20090820.patch
>
>
> In some hashCode() implementation (e.g. Block.hashCode()), the formula has
> the form
> {noformat}
> 37 * 17 + f(x),
> {noformat}
> where f( x ) is some function. Adding 37*17 to f( x ) shifts the value of f(
> x ). It is not effective to do shifting in hash functions. The computation
> is redundant.
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