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https://issues.apache.org/jira/browse/LUCENENET-521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13649111#comment-13649111
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Simon Svensson commented on LUCENENET-521:
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Further debugging in the StackOverflow question shows that the 2.9.4
implementation of MemoryMappedDirectory uses memory-mapped files, while the
3.0.3 implementation just reads the files into MemoryStream objects.
References:
http://stackoverflow.com/questions/16312063/interesting-lucene-net-exception
https://svn.apache.org/repos/asf/lucene.net/tags/Lucene.Net_2_9_4g_RC1/src/core/Support/MemoryMappedDirectory.cs
https://github.com/apache/lucene.net/blob/3.0.3/src/core/Store/MMapDirectory.cs
> Concurrency bug with MMapDirectory
> ----------------------------------
>
> Key: LUCENENET-521
> URL: https://issues.apache.org/jira/browse/LUCENENET-521
> Project: Lucene.Net
> Issue Type: Bug
> Components: Lucene.Net Core
> Affects Versions: Lucene.Net 3.0.3
> Environment: Visual Studio 2012, Lucene.Net 3.0.3 via Nudget, Windows
> 8 64bit, 4GB DDR3
> Reporter: Tamas Varga
> Priority: Blocker
> Attachments: _0.cfs, _0.cfx, segments_2, segments.gen
>
>
> It seems like mmapdirectory doesnt handle concurrency
> this works fine: http://pastebin.com/EQx0L23K
> This:http://pastebin.com/ay6B2Krp (note that the only diff is, that i changed
> the FsDirectory.Open(newDirInfo) to new MMapDirectory(newDirinfo) in line 12 )
> fails with exception:
> {System.ArgumentOutOfRangeException: Index was out of range. Must be
> non-2negative and less than the size of the collection.
> Full exception here: http://pastebin.com/erZTxH3d
> If in the second code example I set the concurrentTaskCount to 1, everything
> is just fine.
> Looks like a concurrency bug for me. Am I missing something?
> T
> Edit: I attached to content of the newMMap folder, after the index is created
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