This is also how my alma mater (Cal Poly SLO) teaches Hadoop. Building real world clusters are expensive, and giving each student their own is difficult. Howeve

This is also how my alma mater (Cal Poly SLO) teaches Hadoop. Building real world clusters are expensive, and giving each student their own is difficult. However, small clusters of Raspberry Pis are cheap, and it's also very easy to demonstrate how unplugging one affects the cluster.