Use MD5 for attachment ETag
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Key: COUCHDB-1337
URL: https://issues.apache.org/jira/browse/COUCHDB-1337
Project: CouchDB
Issue Type: Improvement
Affects Versions: 1.1.1
Reporter: Jacob Wright
Priority: Minor
Currently attachments use the revision number of the document they're attached
to for their ETag. This can be inefficient if many attachments are added,
removed, or modified on the same document. Example: a website's assets might be
stored on a document. Whenever one file is changed every file on the website
drops out of cache.
If we could use the MD5 of the attachment for the ETag then any caches
(including the browser's) will not drop unchanged files, even if the document
to which they are attached is modified.
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