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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-2589) Add a variable-sized int block codec
Date Fri, 06 Aug 2010 10:57:16 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2589?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael McCandless updated LUCENE-2589:
---------------------------------------

    Attachment: LUCENE-2589.patch

Attached patch.

Just like for the fixed int block case, I added a MockVariableIntBlockCodec (in src/test),
with a stupid variable-sized int block encoding.

These MockVariable/FixedIntBlockCodec serve as a good example of how one can take any low-level
int encoder and turn it into a Lucene codec.

I also increased randomness of the codecs picked for testing, by adding params like block
size (for both fixed & variable mock intblock codecs) and the freq cutoff for Pulsing.
 So these configurations are now also randomly picked when running tests (= spikes on the
monster's back).

> 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
>
>
> 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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