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From "Nathan Vander Wilt (JIRA)" <>
Subject [jira] [Commented] (COUCHDB-1950) ddoc-based conflict resolution
Date Tue, 03 Dec 2013 01:58:35 GMT


Nathan Vander Wilt commented on COUCHDB-1950:

The overall narrative is I'd like to be able to write apps that:

1. Can simply save data via a PUT request, since CouchDB has infrastructure for *eventual*
consistency anyway [COUCHDB-1948]
2. Then, when the nearly-inevitable replication and/or clustering–based conflict arises,
it'd be nice to have all the information necessary to do a proper diff/merge [COUCHDB-1949]
3. Since we'd be embracing "write first, resolve conflicts later" it'd be nice to centralize
this resolution pattern by letting apps provide the requisite custom logic in a design doc
rather than making me handle it during a read or via a background process [COUCHDB-1950]

Does that help? Maybe this is technically infeasible, but it is a system I want and CouchDB
seemed like the best person to ask.

> ddoc-based conflict resolution
> ------------------------------
>                 Key: COUCHDB-1950
>                 URL:
>             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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