Alright! We have built a very basic persistence layer. We mentioned there were three issues with our in-memory solution:

  • no persistence

  • no data sharing between multiple servers

  • it is a single server

We have solved the first issue. We have built a simple key-value server that stores all of its data in a single file on disk. There are lots of edge cases we haven't dealt with, which are interesting exercises for you to think about:


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