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From "Jean-Marc Spaggiari (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7884) ByteBloomFilter's performance can be improved by avoiding multiplication when generating hash
Date Thu, 21 Feb 2013 01:40:11 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13582779#comment-13582779
] 

Jean-Marc Spaggiari commented on HBASE-7884:
--------------------------------------------

Yep, it should have been:

Initial loop, compositeHash = hash1 = (hash1 + 0 * hash2)
Loop 2: compositeHash = hash1 + hash2 = (hash1 + 1 * hash2)
Loop 3: compositeHash = hash1 + hash2 + hash2 = (hash1 + 2 * hash2)
                
> ByteBloomFilter's performance can be improved by avoiding multiplication when generating
hash 
> ----------------------------------------------------------------------------------------------
>
>                 Key: HBASE-7884
>                 URL: https://issues.apache.org/jira/browse/HBASE-7884
>             Project: HBase
>          Issue Type: Bug
>          Components: Performance
>    Affects Versions: 0.94.5
>            Reporter: clockfly
>            Priority: Minor
>         Attachments: bloom_performance_tunning.patch
>
>
> ByteBloomFilter's performance can be optimized by avoiding multiplication operation when
generating hash 

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