[reiddraper]

There are a several ways to approach this. The simplest is to just take last-write-wins, which is the only option some distributed databases give you. For cases where this isn't ideal, you resolve write-conflicts in a couple ways.

One way is to write domain-specific logic that knows how to resolve your values. For example, your models might have some state that only happen-after another state, so conflicts of this nature resolve to the 'later' state.

Another approach is to use data-structures or a library designed for this, like CRDTs. Some resources below:

A comprehensive study of Convergent and Commutative Replicated Data Types http://hal.archives-ouvertes.fr/inria-00555588/

https://github.com/reiddraper/knockbox https://github.com/aphyr/meangirls https://github.com/ericmoritz/crdt https://github.com/mochi/statebox

[stock_toaster]

Are there any connector libs that provide "simple" last-write-wins out of the box?

[bonzoesc]

Simple last-write-wins can be configured per-bucket, so client libs can be naïve: http://wiki.basho.com/HTTP-Set-Bucket-Properties.html

[aphyr]

It's not hard. def merge(siblings) { sort_by(siblings) { |s| s.timestamp } }.last

Or, in Knockbox/Meangirls, strategies like LWW-set.

Until your clocks get out of sync.