RFC3284 support for delta-based attachment updates
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Key: COUCHDB-554
URL: https://issues.apache.org/jira/browse/COUCHDB-554
Project: CouchDB
Issue Type: New Feature
Components: Database Core
Reporter: Robert Newson
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 (http://www.faqs.org/rfcs/rfc3284.html) 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, though.
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