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From "Michael McCandless (JIRA)" <>
Subject [jira] [Commented] (LUCENE-4069) Segment-level Bloom filters for a 2 x speed up on rare term searches
Date Wed, 30 May 2012 15:35:24 GMT


Michael McCandless commented on LUCENE-4069:

When I run all tests with the bloom 4.0 postings format ({{ant test-core -Dtests.postingsformat=BloomFilteredLucene40PostingsFormat}}),
I see a lot of failures..., eg lots of CheckIndex failures like:

   [junit4]   1> java.lang.RuntimeException: vector term=[e4 b8 80 74 77 6f] field=textField2Utf8
does not exist in postings; doc=0
   [junit4]   1> 	at org.apache.lucene.index.CheckIndex.testTermVectors(
   [junit4]   1> 	at org.apache.lucene.index.CheckIndex.checkIndex(
   [junit4]   1> 	at org.apache.lucene.util._TestUtil.checkIndex(
   [junit4]   1> 	at
   [junit4]   1> 	at org.apache.lucene.index.TestFieldsReader.afterClass(
   [junit4]   1> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   [junit4]   1> 	at sun.reflect.NativeMethodAccessorImpl.invoke(

But also other spooky failures.  Are these known issues?
> Segment-level Bloom filters for a 2 x speed up on rare term searches
> --------------------------------------------------------------------
>                 Key: LUCENE-4069
>                 URL:
>             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: BloomFilterCodec40.patch, MHBloomFilterOn3.6Branch.patch,
> 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:
> Benchmarks based on Wikipedia content here:
> 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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