lucene-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Shai Erera (JIRA)" <>
Subject [jira] Resolved: (LUCENE-2574) Optimize copies between IndexInput and Output
Date Fri, 30 Jul 2010 06:17:15 GMT


Shai Erera resolved LUCENE-2574.

    Resolution: Fixed

Committed revision 980654 (3x).
Committed revision 980656 (trunk).

> Optimize copies between IndexInput and Output
> ---------------------------------------------
>                 Key: LUCENE-2574
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Store
>            Reporter: Shai Erera
>            Assignee: Shai Erera
>             Fix For: 3.1, 4.0
>         Attachments: 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.

This message is automatically generated by JIRA.
You can reply to this email to add a comment to the issue online.

To unsubscribe, e-mail:
For additional commands, e-mail:

View raw message