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From "robert engels (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1035) Optional Buffer Pool to Improve Search Performance
Date Fri, 26 Oct 2007 02:02:50 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12537805
] 

robert engels commented on LUCENE-1035:
---------------------------------------

I don't think this is any better than the NIOFileCache directory I had already submitted.

It not really approved because the community felt that it did not offer much over the standard
OS file system cache.

My tests showed it was better, but I think this would fall into the same problem.

> 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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