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From "Ning Li (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1035) Optional Buffer Pool to Improve Search Performance
Date Fri, 26 Oct 2007 23:03:51 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12538129
] 

Ning Li commented on LUCENE-1035:
---------------------------------

> That seems like quite a few docs to retrieve--any particular reason why?

I was guessing most applications won't want all 590K results, no? Lucene is used in so many
different ways. No represent-all use case.

> I echo Hoss' comment--proximity searching is important even if it isn't used much directly
by users.

Hmm, I agree with you and Hoss, especially in applications where proximity is used to rank
results of OR queries.

> Optional Buffer Pool to Improve Search Performance
> --------------------------------------------------
>
>                 Key: LUCENE-1035
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1035
>             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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