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https://issues.apache.org/jira/browse/LUCENE-2471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12967100#action_12967100
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Shai Erera commented on LUCENE-2471:
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At some point IndexInput/Output.copyBytes did use FileChannel optimization in
FSDirectory, but that caused troubles I think when the copying thread was
interrupted. So it was removed and we were left w/ the default impl.
> Supporting bulk copies in Directory
> -----------------------------------
>
> Key: LUCENE-2471
> URL: https://issues.apache.org/jira/browse/LUCENE-2471
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Store
> Reporter: Earwin Burrfoot
> Fix For: 3.1, 4.0
>
>
> A method can be added to IndexOutput that accepts IndexInput, and writes
> bytes using it as a source.
> This should be used for bulk-merge cases (offhand - norms, docstores?). Some
> Directories can then override default impl and skip intermediate buffers
> (NIO, MMap, RAM?).
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