MySQL 5.6 GTID replication 'Got fatal error 1236 from master when reading data from binary log'

MySQL 5.6 GTID replication 'Got fatal error 1236 from master when reading data from binary log' typically occurs when the MASTER purges it's binary logs and your SLAVE is using either replicate-do-db or replicate-ignore-db.

Monitoring Multi-Master MySQL Deployments GTIDs using gtidmonitor

MySQL GTID is relatively new and the popular tools for monitoring MySQL servers are still playing catch-up. Here is a rudimentary web-based tool for monitoring MySQL GTIDs in multi-master multi-slave deployments: gtidmonitor