Return-Path: X-Original-To: apmail-lucene-dev-archive@www.apache.org Delivered-To: apmail-lucene-dev-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 664FEC1C9 for ; Wed, 30 May 2012 15:35:27 +0000 (UTC) Received: (qmail 16037 invoked by uid 500); 30 May 2012 15:35:24 -0000 Delivered-To: apmail-lucene-dev-archive@lucene.apache.org Received: (qmail 15792 invoked by uid 500); 30 May 2012 15:35:24 -0000 Mailing-List: contact dev-help@lucene.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: dev@lucene.apache.org Delivered-To: mailing list dev@lucene.apache.org Received: (qmail 15762 invoked by uid 99); 30 May 2012 15:35:24 -0000 Received: from issues-vm.apache.org (HELO issues-vm) (140.211.11.160) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 30 May 2012 15:35:24 +0000 Received: from isssues-vm.apache.org (localhost [127.0.0.1]) by issues-vm (Postfix) with ESMTP id C4E9D142858 for ; Wed, 30 May 2012 15:35:23 +0000 (UTC) Date: Wed, 30 May 2012 15:35:23 +0000 (UTC) From: "Mark Harwood (JIRA)" To: dev@lucene.apache.org Message-ID: <240765792.16618.1338392123810.JavaMail.jiratomcat@issues-vm> In-Reply-To: <779773358.14423.1337355913561.JavaMail.tomcat@hel.zones.apache.org> Subject: [jira] [Commented] (LUCENE-4069) Segment-level Bloom filters for a 2 x speed up on rare term searches MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 [ https://issues.apache.org/jira/browse/LUCENE-4069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13285744#comment-13285744 ] Mark Harwood commented on LUCENE-4069: -------------------------------------- This fails if you add docs with title and text fields: {code:title=ThisCrashes.java} Codec fooCodec=new Lucene40Codec() { @Override public PostingsFormat getPostingsFormatForField(String field) { if ("text".equals(field)) { return new MemoryPostingsFormat(false); } if ("title".equals(field)) { return new MemoryPostingsFormat(true); } else { return super.getPostingsFormatForField(field); } } }; {code} Exception in thread "main" java.io.IOException: Cannot overwrite: C:\temp\luceneCodecs\_2_Memory.ram This also fails: {code:title=ThisToo.java} Codec fooCodec=new Lucene40Codec() { SimpleTextPostingsFormat theSimple = new SimpleTextPostingsFormat(); @Override public PostingsFormat getPostingsFormatForField(String field) { if ("text".equals(field)) { return new SimpleTextPostingsFormat(); } if ("title".equals(field)) { return new SimpleTextPostingsFormat(); } else { return super.getPostingsFormatForField(field); } } }; {code} with Exception in thread "main" java.io.IOException: Cannot overwrite: C:\temp\luceneCodecs\_1_SimpleText.pst Whereas sharing the same instance of a PostingsFormat class across fields works: {code:title=ThisWorks.java} Codec fooCodec=new Lucene40Codec() { SimpleTextPostingsFormat theSimple = new SimpleTextPostingsFormat(); @Override public PostingsFormat getPostingsFormatForField(String field) { if (("text".equals(field))|| ("title".equals(field))) { return theSimple; } else { return super.getPostingsFormatForField(field); } } }; {code} > 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-unsubscribe@lucene.apache.org For additional commands, e-mail: dev-help@lucene.apache.org