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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (LUCENE-2615) DirectIOLinuxDirectory hardwires buffer size and creates files with invalid permissions
Date Mon, 23 Aug 2010 17:28:16 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2615?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael McCandless resolved LUCENE-2615.
----------------------------------------

    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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