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| <html> |
| <head> |
| <title> |
| miscellaneous |
| </title> |
| </head> |
| <body> |
| |
| <h1>Misc Tools</h1> |
| |
| The misc package has various tools for splitting/merging indices, |
| changing norms, finding high freq terms, and others. |
| |
| <a id="DirectIODirectory"></a> |
| <h2>DirectIODirectory</h2> |
| |
| <p> |
| {@link org.apache.lucene.misc.store.DirectIODirectory} is a Directory implementation that bypasses the |
| OS's buffer cache (using direct IO) for any IndexInput and IndexOutput |
| used during merging of segments larger than a specified size (default |
| 10 MB). This avoids evicting hot pages that are still in-use for |
| searching, keeping search more responsive while large merges run. |
| |
| <p> |
| See <a target="_top" href="http://blog.mikemccandless.com/2010/06/lucene-and-fadvisemadvise.html">this blog post</a> |
| for details. |
| |
| </body> |
| |
| </html> |
