[richardv]

Maybe I missed this bit of information, but can someone explain....

They use a multi datacenter master - slave redis cluster? What's the relationship between the master and slaves?

Are the slaves just failover? Or are they for read only?

How have they configured their writes and reads from their main application? I'm just curious how their application routes the reads/writes in such a multi-database setup. (Are they using DNS for a manual failover?)

[brown9-2]

This is speculation, but it seems like in the result of a true loss of the redis-master or it's datacenter, someone would have to reconfigure one of the slaves to become a master and reconfigure the applications that use it (or perhaps they have this type of service discovery built-in).