Imagine assigning some value to a variable, reading it back immediately after, and finding out that somehow the write had no effect at all — madness!

This is precisely what can happen when you are using a distributed data store with weak consistency guarantees. “But wait, aren’t databases supposed to take care of consistency issues for me?” I hear you ask. Whether an update becomes visible sooner rather than later depends on the guarantees offered by the database.

Some databases come with counter-intuitive consistency guarantees to provide high availability and performance. Others have knobs that allow you to chose whether…

Roberto Vitillo

Principal Software Engineer @ Microsoft —

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