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From "Earwin Burrfoot (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2369) Locale-based sort by field with low memory overhead
Date Fri, 07 May 2010 13:02:48 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2369?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12865133#action_12865133
] 

Earwin Burrfoot commented on LUCENE-2369:
-----------------------------------------

FieldCache should move to become a plugin of IndexReader in some future. So there's no longer
any statics and no need to call purge.

> I know that the getExposedTuples can be refactored out - it'll be somewhat clunky with
checks for the class for a given IndexReader and different handling of different readers though
And Mike seems to push the split between primitive SegmentReaders and all kinds of MultiReaders,
so they no longer extend same base class. So that task should be easier.

> 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
>
> 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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