Why Cassandra is used for Kong Api Gateway
As per the Kong FAQ at https://getkong.org/about/faq/#which-datastores-are-supported
Postgresql
It is a good candidate if the setup you are aiming at is not distributed
Cassandra
Kong can use Cassandra as its primary datastore if you are aiming at a distributed, high-availability Kong setup. The two main reasons why one would chose Cassandra as Kong's datastore are: - An ease to create a distributed setup (ideal for multi-region). - Ease to scale