Per the article, Redis requires a network call to the redis server. They wanted ...

dingribanda on Dec 23, 2019 | parent | context | favorite | on: Efficient cache for gigabytes of data written in G...

Per the article, Redis requires a network call to the redis server. They wanted an in memory cache. Not sure how would you keep the per machine in memory cache in synch without change propagation to all the machines. This looks like a simple TTL cache.