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https://issues.apache.org/jira/browse/LUCENE-6046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14195053#comment-14195053
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Michael McCandless commented on LUCENE-6046:
--------------------------------------------
I like the test simplifications, and removing dead code from
Operations.determinize.
Can we fix the exc thrown from Regexp to include the offending regular
expression, and fix the test to confirm the message contains it? Maybe also
add RegExp.toStringTree? I found it very useful while debugging the original
regexp :)
I think QueryParserBase should also have a set/get for this option?
> 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
> Attachments: LUCENE-6046.patch, LUCENE-6046.patch
>
>
> 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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