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From "Hoss Man (JIRA)" <>
Subject [jira] Commented: (LUCENE-1035) Optional Buffer Pool to Improve Search Performance
Date Fri, 26 Oct 2007 22:01:50 GMT


Hoss Man commented on LUCENE-1035:

>> 4. Phase Searching: Phrases (terms enclosed by quotation marks) were seldom, while
only 1 in 16 queries contained a phrase

quoted phrases in raw user input may be rare, but that does't mean PhraseQueries are as rare
... apps may artificially create a sloppy PhraseQuery containing all of the individual words
in the users raw query string to help identify matches where the input words all appear close
together (i may be bias in assuming this is common, since it's something i do a lot of personally)

> 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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