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Posted to dev@lucene.apache.org by "Michael McCandless (JIRA)" <ji...@apache.org> on 2014/07/23 20:27:38 UTC

[jira] [Created] (LUCENE-5844) ArrayUtil.grow should not pretend you can actually allocate array[Integer.MAX_VALUE]

Michael McCandless created LUCENE-5844:
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             Summary: ArrayUtil.grow should not pretend you can actually allocate array[Integer.MAX_VALUE]
                 Key: LUCENE-5844
                 URL: https://issues.apache.org/jira/browse/LUCENE-5844
             Project: Lucene - Core
          Issue Type: Bug
          Components: core/other
            Reporter: Michael McCandless
            Assignee: Michael McCandless
             Fix For: 5.0, 4.10


Today if the growth it wants would exceed Integer.MAX_VALUE, it returns Integer.MAX_VALUE, but you can't actually allocate arrays this large; the actual limit is JVM dependent and varies across JVMs ...

It would be nice if we could somehow "introspect" the JVM to find out what its  actual limit is and use that.  http://stackoverflow.com/questions/3038392/do-java-arrays-have-a-maximum-size seems to imply that using Integer.MAX_VALUE - 8 may be "safe" (it's what ArrayList.java apparently uses).



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