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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-2615) DirectIOLinuxDirectory hardwires buffer size and creates files with invalid permissions
Date Mon, 23 Aug 2010 17:14:15 GMT
DirectIOLinuxDirectory hardwires buffer size and creates files with invalid permissions
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                 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


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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