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From "Shad Storhaug (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (LUCENENET-521) Concurrency bug with MMapDirectory
Date Thu, 13 Jul 2017 18:41:00 GMT

     [ https://issues.apache.org/jira/browse/LUCENENET-521?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Shad Storhaug resolved LUCENENET-521.
-------------------------------------
       Resolution: Fixed
    Fix Version/s: Lucene.Net 4.8.0

A regression test (https://github.com/apache/lucenenet/commit/39e63160efd6709c591862a7cf6c8e3a1e44b126)
was added to confirm the new MMapDirectory implementation doesn't have this bug.

> 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
>             Fix For: Lucene.Net 4.8.0
>
>         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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