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List:       lucene-dev
Subject:    [jira] [Updated] (LUCENE-4069) Segment-level Bloom filters for a 2 x speed up on rare term searches
From:       "Mark Harwood (JIRA)" <jira () apache ! org>
Date:       2012-05-31 13:28:23
Message-ID: 1931163046.21799.1338470903938.JavaMail.jiratomcat () issues-vm
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     [ https://issues.apache.org/jira/browse/LUCENE-4069?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel \
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Mark Harwood updated LUCENE-4069:
---------------------------------

    Attachment: BloomFilterPostings40.patch

Added missing class
                
> Segment-level Bloom filters for a 2 x speed up on rare term searches
> --------------------------------------------------------------------
> 
> Key: LUCENE-4069
> URL: https://issues.apache.org/jira/browse/LUCENE-4069
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/index
> Affects Versions: 3.6, 4.0
> Reporter: Mark Harwood
> Priority: Minor
> Fix For: 4.0, 3.6.1
> 
> Attachments: BloomFilterPostings40.patch, MHBloomFilterOn3.6Branch.patch, \
> PrimaryKey40PerformanceTestSrc.zip 
> 
> An addition to each segment which stores a Bloom filter for selected fields in \
> order to give fast-fail to term searches, helping avoid wasted disk access. Best \
> suited for low-frequency fields e.g. primary keys on big indexes with many segments \
> but also speeds up general searching in my tests. Overview slideshow here: \
> http://www.slideshare.net/MarkHarwood/lucene-bloomfilteredsegments Benchmarks based \
> on Wikipedia content here: http://goo.gl/X7QqU Patch based on 3.6 codebase \
> attached. There are no 3.6 API changes currently - to play just add a field with \
> "_blm" on the end of the name to invoke special indexing/querying capability. \
> Clearly a new Field or schema declaration(!) would need adding to APIs to configure \
> the service properly. Also, a patch for Lucene4.0 codebase introducing a new \
> PostingsFormat

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