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Posted to dev@lucene.apache.org by "Uwe Schindler (JIRA)" <ji...@apache.org> on 2010/10/22 00:33:44 UTC
[jira] Resolved: (LUCENE-2716) Improve automaton's
MinimizeOperations.minimizeHopcroft() to not create so many objects
[ https://issues.apache.org/jira/browse/LUCENE-2716?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Uwe Schindler resolved LUCENE-2716.
-----------------------------------
Resolution: Fixed
Committed revision: 1026168
> Improve automaton's MinimizeOperations.minimizeHopcroft() to not create so many objects
> ---------------------------------------------------------------------------------------
>
> Key: LUCENE-2716
> URL: https://issues.apache.org/jira/browse/LUCENE-2716
> Project: Lucene - Java
> Issue Type: Improvement
> Affects Versions: 4.0
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Priority: Minor
> Fix For: 4.0
>
> Attachments: LUCENE-2716.patch, LUCENE-2716.patch
>
>
> MinimizeOperations.minimizeHopcroft() creates a lot of objects because of strange arrays and useless ArrayLists with fixed length. E.g. it created List<List<List<>>>. This patch minimizes this and makes the whole method much more GC friendler by using simple arrays or avoiding empty LinkedLists at all (inside reverse array).
> minimize() is called very very often, especially in tests (MockAnalyzer).
> A test for the method is prepared by Robert, we found a bug somewhere else in automaton, so this is pending until his issue and fix arrives.
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