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https://issues.apache.org/jira/browse/LUCENE-2471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12869579#action_12869579
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Earwin Burrfoot commented on LUCENE-2471:
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The only reason for keeping that iteration within Directory was to reuse the
buffer. The savings are neglectable, I think.
bq. Copying an entire Directory is used by Lucene code only in RAMDir when it's
init'ed w/ a Directory.
So what? :) I used copying an entire Directory for backup purporses, then
switched to copyTo(collection), to cherry-pick a single commit.
Still I agree with switching to single file copy+rename. Back-compat luckily
went out of the window, so we can design better APIs :)
Can we do this in a separate issue from LUCENE-2455 ?
> Supporting bulk copies in Directory
> -----------------------------------
>
> Key: LUCENE-2471
> URL: https://issues.apache.org/jira/browse/LUCENE-2471
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Earwin Burrfoot
>
> 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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