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https://issues.apache.org/jira/browse/LUCENE-1035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12537980
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Yonik Seeley commented on LUCENE-1035:
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Also, in addition to some kind of protection against the LRU cache being busted
by a single query, perhaps the ability to not cover parts of the index (like
stored fields) would also help.
> 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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