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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 -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org