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Date: Fri, 19 Nov 2010 17:50:14 -0500 (EST)
From: "Toke Eskildsen (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Subject: [jira] Updated: (LUCENE-2369) Locale-based sort by field with low
 memory overhead
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     [ https://issues.apache.org/jira/browse/LUCENE-2369?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Toke Eskildsen updated LUCENE-2369:
-----------------------------------

    Attachment: LUCENE-2369.patch

Bugfixes and maintenance. This patches against Lucene trunk revision 1036986 (latest one at the time of writing). Apply the patch in the lucene sub-folder.

> Locale-based sort by field with low memory overhead
> ---------------------------------------------------
>
>                 Key: LUCENE-2369
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2369
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Search
>            Reporter: Toke Eskildsen
>            Priority: Minor
>         Attachments: lucene-2369-20101011.patch, LUCENE-2369.patch, LUCENE-2369.patch, LUCENE-2369.patch
>
>
> The current implementation of locale-based sort in Lucene uses the FieldCache which keeps all sort terms in memory. Beside the huge memory overhead, searching requires comparison of terms with collator.compare every time, making searches with millions of hits fairly expensive.
> This proposed alternative implementation is to create a packed list of pre-sorted ordinals for the sort terms and a map from document-IDs to entries in the sorted ordinals list. This results in very low memory overhead and faster sorted searches, at the cost of increased startup-time. As the ordinals can be resolved to terms after the sorting has been performed, this approach supports fillFields=true.
> This issue is related to https://issues.apache.org/jira/browse/LUCENE-2335 which contain previous discussions on the subject.

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