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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-68) Bloom filters have much higher false-positive rate than expected
Date Wed, 15 Apr 2009 20:23:15 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-68?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12699356#action_12699356
] 

Jonathan Ellis commented on CASSANDRA-68:
-----------------------------------------

One other point that is probably obvious: this change is incompatible with old serialized
bloomfilters since the hash values for a given key necessarily change.

> Bloom filters have much higher false-positive rate than expected
> ----------------------------------------------------------------
>
>                 Key: CASSANDRA-68
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-68
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Jonathan Ellis
>            Assignee: Jonathan Ellis
>             Fix For: 0.3
>
>         Attachments: 0001-r-m-unused-code-including-entire-CountingBloomFilte.patch,
0002-replace-JenkinsHash-w-MurmurHash.-its-hash-distrib.patch, 0003-rename-BloomFilter.fill-add.patch,
0004-rewrite-bloom-filters-to-use-murmur-hash-and-combina.patch, 0004-v3.patch, 0004a-tests.patch,
0004b-code.patch, 0005-switch-back-to-old-hash-generation-code-to-demonstra.patch, fp_test_for_old_code.patch,
fp_test_for_old_code_v2.patch, words.gz
>
>
> Gory details: http://spyced.blogspot.com/2009/01/all-you-ever-wanted-to-know-about.html

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