Multi-Datacenter Cassandra on 32 Raspberry Pi’s @Raspberry_Pi #piday
Brandon and Daniel from Datastax put together a great demonstration of the Cassandra database’s fault tolerance using a cluster of 32 Raspberry Pi’s:
Being able to withstand a data center going down is not just an edge case, it is an absolute necessity for the highly available applications Cassandra powers. While the cloud is far more flexible for production use, nothing beats a big shiny hardware display for a demo.
Our main goal for this project was to take the abstract concept of fault tolerance and make it something you can see in action and interact with.
By pressing a big red button an Arduino cuts the power to a network switch which causes some of the Raspberry Pi nodes to drop out of the cluster. A monitor on the wall displays the health of the cluster and lets you watch as Cassandra recovers from the failed nodes in real time. Great idea to use the Raspberry Pi to demonstrate fault tolerance!
8-6-2021 (August 6, 2021) is the Snakiest day of the year and it’s also this year’s CircuitPython Day! The day highlights all things CircuitPython and Python on Hardware. See you there!
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.