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Posted to dev@lucene.apache.org by "Michael McCandless (JIRA)" <ji...@apache.org> on 2014/11/03 10:51:34 UTC
[jira] [Assigned] (LUCENE-6046) RegExp.toAutomaton high memory use
[ https://issues.apache.org/jira/browse/LUCENE-6046?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Michael McCandless reassigned LUCENE-6046:
------------------------------------------
Assignee: Michael McCandless
> RegExp.toAutomaton high memory use
> ----------------------------------
>
> Key: LUCENE-6046
> URL: https://issues.apache.org/jira/browse/LUCENE-6046
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/queryparser
> Affects Versions: 4.10.1
> Reporter: Lee Hinman
> Assignee: Michael McCandless
> Priority: Minor
>
> When creating an automaton from an org.apache.lucene.util.automaton.RegExp, it's possible for the automaton to use so much memory it exceeds the maximum array size for java.
> The following caused an OutOfMemoryError with a 32gb heap:
> {noformat}
> new RegExp("\\[\\[(Datei|File|Bild|Image):[^]]*alt=[^]|}]{50,200}").toAutomaton();
> {noformat}
> When increased to a 60gb heap, the following exception is thrown:
> {noformat}
> 1> java.lang.IllegalArgumentException: requested array size 2147483624 exceeds maximum array in java (2147483623)
> 1> __randomizedtesting.SeedInfo.seed([7BE81EF678615C32:95C8057A4ABA5B52]:0)
> 1> org.apache.lucene.util.ArrayUtil.oversize(ArrayUtil.java:168)
> 1> org.apache.lucene.util.ArrayUtil.grow(ArrayUtil.java:295)
> 1> org.apache.lucene.util.automaton.Automaton$Builder.addTransition(Automaton.java:639)
> 1> org.apache.lucene.util.automaton.Operations.determinize(Operations.java:741)
> 1> org.apache.lucene.util.automaton.MinimizationOperations.minimizeHopcroft(MinimizationOperations.java:62)
> 1> org.apache.lucene.util.automaton.MinimizationOperations.minimize(MinimizationOperations.java:51)
> 1> org.apache.lucene.util.automaton.RegExp.toAutomaton(RegExp.java:477)
> 1> org.apache.lucene.util.automaton.RegExp.toAutomaton(RegExp.java:426)
> {noformat}
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