can you comment on ease of operations between NDB cluster and aero spike? from my experience NDB cluster is pretty difficult. curious if aero is the same.
Ndb is pretty stable if your workload is stable. Most HLRs at network operators around the world run NDB 24x7, so it is the go-to HA OLTP real-time DB. If, however, you start overloading it, it can be temperamental. So, don't treat it like innodb and do full table scans while expecting millisecond PK lookups.
I can't really comment on running Aerospike in production, because i haven't done it - just run experiments with it.