MySQL Multi-Master Single Slave Replication (via federated slave)

In my search of finding solution for that i come to know about this possibility that is federated slave.

For more reading

http://www.fromdual.com/sites/default/files/mm-single-slave-repl.pdf

http://chintakiran.blogspot.in/2011/10/multi-master-single-slave-for-mysql.html