Synchronous replication

Scenario:

A/B clusters with master-master replication, client writes to A cluster and A pushes all writes to B cluster, and when A cluster is down, client switches writing to B cluster.

But the client's write switch is unsafe due to the replication between A/B is asynchronous: a delete to B cluster which aims to delete a put written earlier can fail due to that put is written to A cluster and isn't successfully pushed to B before A is down. It can be worse if this delete is collected(flush and then major compact occurs) before A cluster is up and that put is eventually pushed to B, the put won't ever be deleted.

Can we provide per-table/per-peer synchronous replication which ships the according hlog entry of write before responsing write success to client? By this we can guarantee the client that all write requests for which he got success response when he wrote to A cluster must already have been in B cluster as well.