We have two production MySQL servers running Percona Server 5.5.42 and would like to set up a new server running Percona Server 5.7 as a slave to them. However, because there's such a gap in versions, the 5.7 slave is unable to get a server_uid back from the 5.5 master(s). The correct solution would be to upgrade the masters, which we are aware of, but due to time and resource constraints it's not possible at this time.
Is there any other work-around? If necessary I can downgrade the slave to 5.6 and come back around in the future and perform necessary upgrades on all servers. What would be the next best thing?