A Linux-specific Directory impl that bypasses the buffer cache
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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
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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