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Hudson commented on HDFS-288: ----------------------------- Integrated in Hadoop-Hdfs-trunk #75 (See [http://hudson.zones.apache.org/hudson/job/Hadoop-Hdfs-trunk/75/]) . 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. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.