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https://issues.apache.org/jira/browse/LUCENE-4069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13397457#comment-13397457
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Michael McCandless commented on LUCENE-4069:
--------------------------------------------
Results after fixing the "not downsizing" bug:
{noformat}
Task QPS base StdDev base QPS bloomStdDev bloom Pct
diff
Fuzzy1 97.02 1.43 88.67 3.08 -13% -
-4%
Fuzzy2 42.50 1.15 40.32 1.75 -11% -
1%
AndHighHigh 17.99 0.29 17.74 0.47 -5% -
2%
Respell 82.76 2.96 81.66 3.54 -8% -
6%
AndHighMed 55.77 1.02 55.06 1.51 -5% -
3%
TermGroup1M 42.35 0.79 41.98 0.85 -4% -
3%
TermBGroup1M 49.55 0.58 49.14 0.60 -3% -
1%
SpanNear 12.53 0.15 12.49 0.09 -2% -
1%
TermBGroup1M1P 64.36 0.83 64.34 0.83 -2% -
2%
Prefix3 34.18 1.25 34.45 1.38 -6% -
8%
Wildcard 34.42 1.12 34.75 1.35 -6% -
8%
SloppyPhrase 11.48 0.17 11.61 0.22 -2% -
4%
Phrase 8.47 0.30 8.57 0.25 -5% -
7%
Term 94.06 4.50 95.45 2.34 -5% -
9%
IntNRQ 9.84 0.63 10.07 0.71 -10% -
16%
OrHighMed 34.57 2.07 35.78 2.24 -8% -
16%
OrHighHigh 11.66 0.64 12.11 0.73 -7% -
16%
PKLookup 129.75 2.37 153.80 2.31 14% -
22%
{noformat}
Basically same as before ... which is good (it means target 10% saturation
doesn't lose any perf).
> 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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