Adafruit is open and shipping! Let's build back better, together!
0

Multi-Datacenter Cassandra on 32 Raspberry Pi’s @Raspberry_Pi #piday

cluster_closeup_final

 

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 caseit 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!

Multi-Datacenter Cassandra on 32 Raspberry Pi’s


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.

Join 26,000+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord

Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Follow Adafruit on Instagram for top secret new products, behinds the scenes and more https://www.instagram.com/adafruit/

CircuitPython – The easiest way to program microcontrollers – CircuitPython.org


Maker Business — To make it through a tough business cycle, layoffs should be a last resort

Wearables — Pipe cleaner purposes

Electronics — Diode Test Current

Python for Microcontrollers — Python on Microcontrollers Newsletter: ESP32-S2 low power, GUIs and more! #Python #Adafruit #CircuitPython @micropython @ThePSF

Adafruit IoT Monthly — The Ultimate Bird Feeder, Adafruit IO UI Refresh, and more!

Microsoft MakeCode — Making a Smart LEGO Ferris Wheel!

EYE on NPI — Maxim’s Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey

New Products – Adafruit Industries – Makers, hackers, artists, designers and engineers! — New Products 11/25/2020 Featuring #Adafruit #SGP40 #AirQuality Sensor Breakout – VOC – STEMMA QT @adafruit #newproducts

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !



No Comments

No comments yet.

Sorry, the comment form is closed at this time.