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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3892) Add a useful intblock postings format (eg, FOR, PFOR, PFORDelta, Simple9/16/64, etc.)
Date Sat, 02 Jun 2012 13:30:23 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13287936#comment-13287936
] 

Michael McCandless commented on LUCENE-3892:
--------------------------------------------

Awesome progress!  Nice to have a dirt path online that we can then
iterate from ...

Hmm, I'm seeing some test failures when I run:
{noformat}
ant test -Dtests.postingsformat=PFor
{noformat}
Eg, TestNRTThreads, TestShardSearching, TestTimeLimitingCollector.

Remember to add the standard copyright headers to each new source
file...

We don't have to do this now, but I wonder if we can share code w/ the
packed ints impl we have, instead generating another one with the .py
source.

TestDemo makes a nice TestMin... I usually start with TestDemo when
testing scary new code, and then it's a huge milestone once TestDemo
passes :)

We should definitely cutover to BlockTree terms dict (I would upgrade
that TODO to a nocommit!).

I suspect that wrapping the blocks byte[] as ByteBuffer and then
IntBuffer is going to be too costly per decode so we should init them
once and re-use (upgrade that TODO to a nocommit).

                
> 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: 4.1
>
>         Attachments: LUCENE-3892_pfor.patch, LUCENE-3892_settings.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
> http://blog.mikemccandless.com/2010/08/lucene-performance-with-pfordelta-codec.html
> ).
> I think this would make a good GSoC project.

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