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From Robert Newson <>
Subject RFC3284 support for attachments
Date Mon, 02 Nov 2009 13:19:49 GMT

I was thinking about being to update an attachment with a binary diff
instead of a full upload (in those cases where the diff would be much
smaller, of course). RFC3284 (
seems to document a generic syntax for describing a patch. The idea is
that you would PUT an encoded diff as the body instead of sending the
full bytes. If the attachment's revision matches your PUT's revision,
then CouchDB will apply the delta to its locally stored version to
make the new version. As a further option, CouchDB could store the
delta itself and apply it on fetch. This might complicate compaction,

Interested in developer's thoughts on this. Is it too niche or would
it be useful to lots of folks? Depending on feedback, I'll add a JIRA
ticket to track it. Note: I won't be jumping on this right now but if
it becomes necessary for my project next year I'll start on it then.


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