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https://issues.apache.org/jira/browse/LUCENE-2615?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless resolved LUCENE-2615.
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Resolution: Fixed
> DirectIOLinuxDirectory hardwires buffer size and creates files with invalid
> permissions
> ---------------------------------------------------------------------------------------
>
> Key: LUCENE-2615
> URL: https://issues.apache.org/jira/browse/LUCENE-2615
> Project: Lucene - Java
> Issue Type: Bug
> Components: contrib/*
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 3.1, 4.0
>
> Attachments: LUCENE-2615.patch
>
>
> TestDemo fails if I use the DirectIOLinuxDirectory (using Robert's new
> -Dtests.directory=XXX), because when it O_CREATs a file, it fails to specify
> the mode, so [depending on C stack!] you can get permission denied.
> Also, we currently hardwire the buffer size to 1 MB (Mark found this)... I
> plan to add a "forcedBufferSize" to the DirectIOLinuxDir's ctor, to
> optionally override lucene's default buffer sizes (which are way too small
> for direct IO to get barely OK performance). If you pass 0 for this then you
> get Lucene's default buffer sizes...
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