I enabled // replication on the slave that has MyISAM tables. The first results are good, but I ended up with what looks like a deadlock. I opened support # 10289 for "Deadlock in Parallel Replication with FLUSH TABLE WITH READ LOCK".

There is a patch for this: https://lists.launchpad.net/maria-developers/msg08675.html But no reply on the review request so far. - Kristian.