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From "Michael McCandless (Commented) (JIRA)" <>
Subject [jira] [Commented] (LUCENE-3892) Add a useful intblock postings format (eg, FOR, PFOR, PFORDelta, Simple9/16/64, etc.)
Date Tue, 03 Apr 2012 14:56:25 GMT


Michael McCandless commented on LUCENE-3892:

The proposal at
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

> Add a useful intblock postings format (eg, FOR, PFOR, PFORDelta, Simple9/16/64, etc.)
> -------------------------------------------------------------------------------------
>                 Key: LUCENE-3892
>                 URL:
>             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
> ).
> I think this would make a good GSoC project.

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