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https://issues.apache.org/jira/browse/LUCENE-4069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13397082#comment-13397082
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Michael McCandless commented on LUCENE-4069:
--------------------------------------------
Results from last patch:
{noformat}
Task QPS base StdDev base QPS bloomStdDev bloom Pct
diff
IntNRQ 11.35 1.27 10.14 0.62 -24% -
6%
Fuzzy1 108.52 3.34 101.82 2.90 -11% -
0%
Prefix3 64.87 2.17 61.55 1.61 -10% -
0%
Wildcard 43.18 1.74 41.33 1.17 -10% -
2%
Fuzzy2 41.76 1.40 40.05 1.00 -9% -
1%
Term 151.71 4.38 147.24 4.42 -8% -
2%
SpanNear 5.23 0.09 5.11 0.12 -6% -
1%
OrHighMed 12.60 0.88 12.34 0.48 -11% -
9%
SloppyPhrase 8.25 0.20 8.09 0.07 -5% -
1%
TermBGroup1M 69.98 0.68 68.80 1.13 -4% -
0%
OrHighHigh 10.06 0.66 9.93 0.39 -11% -
9%
Phrase 12.73 0.30 12.57 0.35 -6% -
3%
TermGroup1M 35.44 0.42 35.08 0.67 -4% -
2%
AndHighMed 63.40 2.27 62.90 1.11 -5% -
4%
Respell 93.11 3.70 92.81 2.33 -6% -
6%
TermBGroup1M1P 50.93 1.53 50.96 1.75 -6% -
6%
AndHighHigh 15.86 0.71 15.93 0.27 -5% -
6%
PKLookup 127.44 2.15 134.85 8.68 -2% -
14%
{noformat}
Looks like FuzzyN/Respell is good again ... PKLookup is a bit faster ... the
rest is likely noise.
> 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: BloomFilterPostingsBranch4x.patch,
> MHBloomFilterOn3.6Branch.patch, PrimaryKeyPerfTest40.java
>
>
> 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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