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https://issues.apache.org/jira/browse/LUCENE-4069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13285746#comment-13285746
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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:
{noformat}
[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(CheckIndex.java:1440)
[junit4] 1> at
org.apache.lucene.index.CheckIndex.checkIndex(CheckIndex.java:575)
[junit4] 1> at
org.apache.lucene.util._TestUtil.checkIndex(_TestUtil.java:186)
[junit4] 1> at
org.apache.lucene.store.MockDirectoryWrapper.close(MockDirectoryWrapper.java:587)
[junit4] 1> at
org.apache.lucene.index.TestFieldsReader.afterClass(TestFieldsReader.java:72)
[junit4] 1> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native
Method)
[junit4] 1> at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
{noformat}
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: 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: BloomFilterCodec40.patch,
> MHBloomFilterOn3.6Branch.patch, PrimaryKey40PerformanceTestSrc.zip
>
>
> 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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