This session describes investigations into performance and scalability of InnoDB when using the binlog for replication, focusing primarily on the replication master. The session will highlight tools and techniques used to reveal scalability bottlenecks within the MySQL and InnoDB code, approaches used to eliminate those bottlenecks, and current results. The discussion will focus on a current prototype patch that achieves substantial throughput increases for read/write workloads, and enables concurrent commits for InnoDB XA transactions. - Note that the video must be downloaded to be able to view it!