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https://issues.apache.org/jira/browse/LUCENE-2292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12840382#action_12840382
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Uwe Schindler commented on LUCENE-2292:
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There are also other non Sun JREs on the market (IBM, Harmony,...). And e.g.
the forceful unmap of MMap dirs is not working on all of them. It is simply
hack. Performance is no problem for Directory as close() is seldom called, so
there is no method cache in MMapDirectory.
> ByteBuffer Directory - allowing to store the index outside the heap
> -------------------------------------------------------------------
>
> Key: LUCENE-2292
> URL: https://issues.apache.org/jira/browse/LUCENE-2292
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Store
> Reporter: Shay Banon
> Attachments: LUCENE-2292.patch
>
>
> A byte buffer based directory with the benefit of being able to create direct
> byte buffer thus storing the index outside the JVM heap.
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