In the 1800s, before serfdom was abolished in the Russian empire, landowners paid taxes based on how many serfs they had. A census was conducted every few years by government employees traveling across the empire and doing counts; a manual map-reduce of epic proportions. If a person was dead, it would often be years before the government cleared the cache, so to speak, and landowners continued to pay taxes on these dead souls. Alexandr Pushkin, the greatest living Russian-language author at t...
