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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2365) Result of HashFunction.hash() contains all identical values
Date Thu, 06 Dec 2007 22:25:43 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12549215

Hadoop QA commented on HADOOP-2365:

-1 overall.  Here are the results of testing the latest attachment 
against trunk revision r601845.

    @author +1.  The patch does not contain any @author tags.

    javadoc +1.  The javadoc tool did not generate any warning messages.

    javac +1.  The applied patch does not generate any new compiler warnings.

    findbugs +1.  The patch does not introduce any new Findbugs warnings.

    core tests +1.  The patch passed core unit tests.

    contrib tests -1.  The patch failed contrib unit tests.

Test results: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1285/testReport/
Findbugs warnings: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1285/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1285/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1285/console

This message is automatically generated.

> Result of HashFunction.hash() contains all identical values
> -----------------------------------------------------------
>                 Key: HADOOP-2365
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2365
>             Project: Hadoop
>          Issue Type: Bug
>          Components: contrib/hbase
>    Affects Versions: 0.16.0
>            Reporter: Andrzej Bialecki 
>            Assignee: Jim Kellerman
>             Fix For: 0.16.0
>         Attachments: hash-v1.patch, patch.txt, patch.txt
> There is a small bug in HashFunction:112 - initvalue should be changed between the loop
iterations in order to spread the hash values over the whole allowed range. Instead the current
code uses a fixed initvalue = 0, which gives all identical hash values in the result array.
As a result, BloomFilter-s have extremely high rate of false positives.

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