lucene-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Toke Eskildsen (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-2369) Locale-based sort by field with low memory overhead
Date Thu, 02 Sep 2010 13:38:55 GMT

     [ 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

Preliminary patch with the primary purpose of testing the viability of this issue.

Create a Lucene flex index (Version.40+) and call
java -cp build/lucene-core-4.0-dev.jar org.apache.lucene.search.exposed.poc.ExposedPOC
to test.

> 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.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.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscribe@lucene.apache.org
For additional commands, e-mail: dev-help@lucene.apache.org


Mime
View raw message