[KnownSubset]

From my experience etcd is pretty rock solid, until you start using it across availability zones. Then if you add in SSL into the mix, the reliability drops even further if you are using the default configuration. At that point you need to start tweaking the heartbeat and timeout parameters for a the cluster to stay stable.

[ideal0227]

We have fixed the SSL issue in 2.1. We are also considering back-port it to 2.0 release if possible.