I'm on the CD team at Airbnb. We're in progress of migrating to Spinnaker.
It is the most powerful deploy tool out there but it's also a beast to run. We have a team of 5 engineers to manage it.
I have looked at Spinnaker a year ago, at that time you had to use both Redis and Cassandra as databases for it. It seems like most of the infrastructure costs would go to feed the spinnaker instead of the actual backend applications.. :D
Cassandra is no longer a requirement :)
We back it with S3, Redis and RDS
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