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https://issues.apache.org/jira/browse/LUCENE-2500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12973055#action_12973055
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Michael McCandless commented on LUCENE-2500:
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It does work, but, it's not "general purpose", ie it's up to the app to only
use it for indexing and not searching.
With IOContext we should be able to make it general purpose, ie whether to use
direct IO or not can be determined by looking at the context.
> A Linux-specific Directory impl that bypasses the buffer cache
> --------------------------------------------------------------
>
> Key: LUCENE-2500
> URL: https://issues.apache.org/jira/browse/LUCENE-2500
> Project: Lucene - Java
> Issue Type: Improvement
> Components: contrib/*
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 3.1, 4.0
>
> Attachments: LUCENE-2500.patch
>
>
> I've been testing how we could prevent Lucene's merges from evicting
> pages from the OS's buffer cache. I tried fadvise/madvise (via JNI)
> but (frustratingly), I could not get them to work (details at
> http://chbits.blogspot.com/2010/06/lucene-and-fadvisemadvise.html).
> The only thing that worked was to use Linux's O_DIRECT flag, which
> forces all IO to bypass the buffer cache entirely... so I created a
> Linux-specific Directory impl to do this.
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