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https://issues.apache.org/jira/browse/LUCENE-2574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12895203#action_12895203
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Michael McCandless commented on LUCENE-2574:
--------------------------------------------
Duh sorry you are correct! fileOffset is the "base" of this file within the
CFS.
Better to finish drinking coffee in the morning before thinking too much...
> Optimize copies between IndexInput and Output
> ---------------------------------------------
>
> Key: LUCENE-2574
> URL: https://issues.apache.org/jira/browse/LUCENE-2574
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Store
> Reporter: Shai Erera
> Assignee: Shai Erera
> Fix For: 3.1, 4.0
>
> Attachments: LUCENE-2574.patch, LUCENE-2574.patch, LUCENE-2574.patch
>
>
> We've created an optimized copy of files from Directory to Directory. We've
> also optimized copyBytes recently. However, we're missing the opposite side
> of the copy - from IndexInput to Output. I'd like to mimic the FileChannel
> API by having copyTo on IndexInput and copyFrom on IndexOutput. That way,
> both sides can optimize the copy process, depending on the type of the
> IndexInput/Output that they need to copy to/from.
> FSIndexInput/Output can use FileChannel if the two are FS types.
> RAMInput/OutputStream can copy to/from the buffers directly, w/o going
> through intermediate ones. Actually, for RAMIn/Out this might be a big win,
> because it doesn't care about the type of IndexInput/Output given - it just
> needs to copy to its buffer directly.
> If we do this, I think we can consolidate all Dir.copy() impls down to one
> (in Directory), and rely on the In/Out ones to do the optimized copy. Plus,
> it will enable someone to do optimized copies between In/Out outside the
> scope of Directory.
> If this somehow turns out to be impossible, or won't make sense, then I'd
> like to optimize RAMDirectory.copy(Dir, src, dest) to not use an intermediate
> buffer.
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