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From "Jan Lehnardt (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COUCHDB-1950) ddoc-based conflict resolution
Date Mon, 09 Dec 2013 14:28:07 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-1950?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13843195#comment-13843195
] 

Jan Lehnardt commented on COUCHDB-1950:
---------------------------------------

What then, is our story for app-level resolution functions? A _changes-feed powered app-level-resolver
will create the same issues as far as I can tell and I am happy to use a different thing altogether.

Whatever we suggest that people do in their apps, I’d like to take a piece out of the boilerplate
that they need to set up for running CouchDB apps. (I hope that clarifies my motivation).

> 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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