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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4069) Segment-level Bloom filters for a 2 x speed up on rare term searches
Date Tue, 19 Jun 2012 23:54:43 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13397173#comment-13397173
] 

Michael McCandless commented on LUCENE-4069:
--------------------------------------------

{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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