Redis is an in-memory NoSQL store that can store 5 types of data: Strings, Lists, Sets, Sorted-Sets and HashMaps. It is a good choice for fast reads/writes in distributed systems for a relatively small dataset size that is memory-capacity bound.v2.8.x is supported by AWS Elasticache for a DevOps-free deploy, which supports replication strategy of 1 writable primary and up to 5 secondary read-onlys. (v3.0 brings native cluster support, & 3.2 has some geo features). Redis background persistence ......