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https://issues.apache.org/jira/browse/COUCHDB-1337?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13145958#comment-13145958
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Robert Newson commented on COUCHDB-1337:
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Feedback from devs welcome.
> Use MD5 for attachment ETag
> ---------------------------
>
> 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
> Assignee: Robert Newson
> Priority: Minor
> Attachments:
> 0001-CouchDB-1337-Use-attachments-md5-as-ETag-if-availabl.patch
>
>
> 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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