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https://issues.apache.org/jira/browse/LUCENE-2471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12966358#action_12966358
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Earwin Burrfoot commented on LUCENE-2471:
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Hmmm. Are we going to do this?
Optimized bulk copies IndexInput -> IndexOutput for merges.
I currently see II.copyBytes(IndexOutput out, long numBytes) method in trunk,
but it's a little bit of a mess (II.copyBytes calls IO.copyBytes, strange
overrides doing the same thing in various ways),
no optimizations for FSDirectory (or at least NIOFSdirectory) case,
no offset parameter?
not used when bulk-merging? (well, DataOutput.copyBytes _is_ used, but there's
a single inefficient version of it)
> 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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