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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2589) Add a variable-sized int block codec
Date Sun, 08 Aug 2010 21:20:16 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2589?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12896417#action_12896417
] 

Robert Muir commented on LUCENE-2589:
-------------------------------------

bq. When I want to use randomized tests but need to force a certain codec that wouldn't work.

Yes it would, as random codec selection would be determined by the same random seed (so if
you use the same seed, you force the same codec).

bq. Anyway, a documentation of whatever we do here would help people new to lucene to get
started with patches and test.

I dont think we should add a lot of documentation (which will only become obselete as i know
i will be adding even more dimensions to the test ASAP). I think its better to simplify and
use a single seed for selecting all parameters! 

> Add a variable-sized int block codec
> ------------------------------------
>
>                 Key: LUCENE-2589
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2589
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: 4.0
>
>         Attachments: LUCENE-2589.patch, LUCENE-2589.patch
>
>
> We already have support for fixed block size int block codecs, making it very simple
to create a codec from a int encoder algorithms like FOR/PFOR.
> But algorithms like Simple9/16 are not fixed -- they encode a variable number of adjacent
ints at once, depending on the specific values of those ints.

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