Databases: Cassandra
It seems likely most Raspberry Pi users aren't familiar with Cassandra. Cassandra is a database seemingly oriented at the opposite end of the computing spectrum from the Raspberry Pi; Cassandra is used to manage some of the largest databases ever created. That said, when the company that offers commercial support for Cassandra, DataStax, wanted to build a Cassandra cluster to take demonstrate the resilience of Cassandra clusters, they turned to the then-current Raspberry Pi 3B+, which barely had enough resources to run Cassandra. With the advent of the Raspberry Pi 4, and especially with USB booting, the Pi is now a credible little server to run Cassandra on. But! I'm not running a production server on my Pi. Yet. I've been following the Cassandra 4.0 release path, which has been in seemingly endless freefall, whether due to complications from covid-19, or because everyone is mostly happy with the current release, I can't tell. But I do keep my Cassandra 4....