You do say "async cluster solution", so I'm wondering if you mean NDBCLUSTER? If you are, you might refer to:
On 24 Sep 2013, at 06:32, Roberto Spadim <roberto@spadim.com.br> wrote:
> Hi guys, i got a question yesterday...
> there's an async cluster solution? example...
> multi-master and async? if it's async, it can't be multi-master, i'm wrong?
>
http://www.clusterdb.com/mysql-cluster/mysql-cluster-asynchronous-replication-conflict-detection-resolution1/
Naturally, the above doesn't apply to MariaDB as we don't ship NDBCLUSTER.
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