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https://issues.apache.org/jira/browse/COUCHDB-1950?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13843143#comment-13843143
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Robert Newson commented on COUCHDB-1950:
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Allowing programmatic control over which leaf is returning by GET /dbname/docid 
is much less controversial than "ddoc-based conflict resolution", since that 
brings the real danger of destroying eventual consistency and creating positive 
edit cycle feedback. I'd support the former, but not the latter.



> ddoc-based conflict resolution
> ------------------------------
>
>                 Key: COUCHDB-1950
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-1950
>             Project: CouchDB
>          Issue Type: Improvement
>            Reporter: Nathan Vander Wilt
>
> This was discussed at CouchConf in Vancouver last month, but didn't see a 
> hook here I could refer to in another conversation, so…
> It'd be great if a design document could include a conflict resolver 
> function, in the vein of other "app logic" handler hooks like 
> validate_doc_write. I imagine it would look something like either "function 
> (currentWinner, nextWinningestLoser, parent)" (simply called multiple times 
> if more than 2 leafs) or simply "function (arrayOfDocs, revisionHistor)" — if 
> it returns a document, that's the winner, if not the next design document in 
> line gets a pass at it. (Bonus: if it throws, the conflict stays no matter 
> what other resolvers say?)



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