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From "Doug Cutting (JIRA)" <>
Subject [jira] Commented: (LUCENE-1035) Optional Buffer Pool to Improve Search Performance
Date Mon, 29 Oct 2007 20:23:50 GMT


Doug Cutting commented on LUCENE-1035:

Ning, I didn't mean to sound negative about this.  Your benchmarks do show that in some situations
this can provide significant speedup.  The question is whether such situations are common
enough to warrant adding this to the core.  A way around that might be to layer it on top
of FSDirectory and add it to contrib.

> Optional Buffer Pool to Improve Search Performance
> --------------------------------------------------
>                 Key: LUCENE-1035
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Store
>            Reporter: Ning Li
>         Attachments: LUCENE-1035.patch
> Index in RAMDirectory provides better performance over that in FSDirectory.
> But many indexes cannot fit in memory or applications cannot afford to
> spend that much memory on index. On the other hand, because of locality,
> a reasonably sized buffer pool may provide good improvement over FSDirectory.
> This issue aims at providing such an optional buffer pool layer. In cases
> where it fits, i.e. a reasonable hit ratio can be achieved, it should provide
> a good improvement over FSDirectory.

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