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From "Lee Hinman (JIRA)" <>
Subject [jira] [Created] (LUCENE-6046) RegExp.toAutomaton high memory use
Date Mon, 03 Nov 2014 09:28:33 GMT
Lee Hinman created LUCENE-6046:

             Summary: RegExp.toAutomaton high memory use
                 Key: LUCENE-6046
             Project: Lucene - Core
          Issue Type: Bug
          Components: core/queryparser
    Affects Versions: 4.10.1
            Reporter: Lee Hinman
            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:

new RegExp("\\[\\[(Datei|File|Bild|Image):[^]]*alt=[^]|}]{50,200}").toAutomaton();

When increased to a 60gb heap, the following exception is thrown:

  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(
  1>     org.apache.lucene.util.ArrayUtil.grow(
  1>     org.apache.lucene.util.automaton.Automaton$Builder.addTransition(
  1>     org.apache.lucene.util.automaton.Operations.determinize(
  1>     org.apache.lucene.util.automaton.MinimizationOperations.minimizeHopcroft(
  1>     org.apache.lucene.util.automaton.MinimizationOperations.minimize(
  1>     org.apache.lucene.util.automaton.RegExp.toAutomaton(
  1>     org.apache.lucene.util.automaton.RegExp.toAutomaton(

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