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From "Toke Eskildsen (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-2369) Locale-based sort by field with low memory overhead
Date Tue, 06 Apr 2010 09:53:33 GMT
Locale-based sort by field with low memory overhead
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                 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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