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https://issues.apache.org/jira/browse/LUCENE-4069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13397174#comment-13397174
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Michael McCandless commented on LUCENE-4069:
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{quote}
My Windows-based woes were:
1) Had to install python (used 2.7)
{quote}
OK.
bq. 2) Figure out python proxy settings for Wikipedia download
Hmmm ... you can also manually download separately.
bq. 3) PySVN missing - downloaded install exe but it claimed Python 2.7 wasn't
installed/available so gave up and did svn checkout manually
Oh I see: setup.py uses PySVN; hmm. Just checking out manually is better...
bq. 4) Ran first python test and it aborted with complaint about GnuPlot missing
Hmm we should default printIndexCharts to False (I'll fix).
bq. I imagine most of what is needed here comes out of the box on typical
OSX/Linux setup.
Hmm I don't think pysvn does, nor gnuplot ...
> 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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