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Michael McCandless commented on LUCENE-3892: -------------------------------------------- The proposal at http://www.google-melange.com/gsoc/proposal/review/google/gsoc2012/billybob/1 looks great! Some initial feedback: * There are actually more than 2 codecs (eg we also have Lucene3x, SimpleText, sep/intblock (abstract), random codecs/postings formats for testing...), but our default codec now is Lucene40. * I think you can use the existing abstract sep/intblock classes (ie, they implement layers like FieldsProducer/Consumer...), and then you can "just" implement the required methods (eg to encode/decode one int[] block). * We may need to tune the skipper settings, based on profiling results from skip-intensive (Phrase, And) queries... since it's currently geared towards single-doc-at-once encoding. I don't think we should try to make a new skipper impl here... (there is a separate issue for that). * Maybe explore the combination of pulsing and PForDelta codecs; seems like the combination of those two could be important, since for low docFreq terms, retrieving the docs is now more expensive... > Add a useful intblock postings format (eg, FOR, PFOR, PFORDelta, > Simple9/16/64, etc.) > ------------------------------------------------------------------------------------- > > Key: LUCENE-3892 > URL: https://issues.apache.org/jira/browse/LUCENE-3892 > Project: Lucene - Java > Issue Type: Improvement > Reporter: Michael McCandless > Labels: gsoc2012, lucene-gsoc-12 > Fix For: 4.0 > > > On the flex branch we explored a number of possible intblock > encodings, but for whatever reason never brought them to completion. > There are still a number of issues opened with patches in different > states. > Initial results (based on prototype) were excellent (see > http://blog.mikemccandless.com/2010/08/lucene-performance-with-pfordelta-codec.html > ). > I think this would make a good GSoC project. -- 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