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Posted to dev@lucene.apache.org by "Michael McCandless (JIRA)" <ji...@apache.org> on 2010/10/25 11:47:20 UTC
[jira] Updated: (LUCENE-2722) Sep codec should store less in terms
dict
[ https://issues.apache.org/jira/browse/LUCENE-2722?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Michael McCandless updated LUCENE-2722:
---------------------------------------
Attachment: LUCENE-2722.patch
Patch.
> Sep codec should store less in terms dict
> -----------------------------------------
>
> Key: LUCENE-2722
> URL: https://issues.apache.org/jira/browse/LUCENE-2722
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 4.0
>
> Attachments: LUCENE-2722.patch
>
>
> I'm working on improving Lucene's performance with int block codecs
> (FOR/PFOR), but in early perf testing I found that these codecs cause
> a big perf hit to those MTQs that need to scan many terms but don't
> end up accepting many of those terms (eg fuzzy, wildcard, regexp).
> This is because sep codec stores much more in the terms dict, since
> each file is separate, ie seek points for each of doc, frq, pos, pyl,
> skp files.
> So I'd like to shift these seek points to instead be stored in the doc
> file, except for the doc seek point itself. Since a given query will
> always need to seek to the doc file, this does not add an extra seek.
> But it saves tons of vInt decodes for the next/seke intensive MTQs...
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