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From "Han Jiang (JIRA)" <>
Subject [jira] [Commented] (LUCENE-3892) Add a useful intblock postings format (eg, FOR, PFOR, PFORDelta, Simple9/16/64, etc.)
Date Tue, 05 Jun 2012 03:00:24 GMT


Han Jiang commented on LUCENE-3892:

Thanks Mike, we have so much details to help optimize!

bq.Still missing a couple license headers (TestMin, TestCompress)...
Ok, I'll add them later.

bq.I ran a quick perf test using on
a 10M doc Wikipedia index.
The script is wonderful! But the wiki data is missing? Can I get it from a wiki dump instead?

bq.Indexing time is ~18% slower than Lucene40PostingsFormat (1071 sec vs 1261 sec).
Yes, it is expected, actually it scans every block 33 times to estimate metadata such as numFrameBits
and numExceptions.
> 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: 4.1
>         Attachments: LUCENE-3892_pfor.patch, LUCENE-3892_pfor.patch, LUCENE-3892_settings.patch,
> 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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