Herb: Multi-DC Replication Engine for Uber’s Schemaless Datastore

[bauerpl]

https://eng.uber.com/herb-datacenter-replication/

[damm]

Go ahead and downvote this; but where's the source?

Otherwise isn't this pointless bragging?

[takeda → damm]

So according to this post they created geographically distributed, multi master (with a mesh topology) that is always consistent.

Either they created a holy grail of databases, or an opportunity to write a great Post-Mortem in the future.

[throwaway123402 → takeda]

It's a little unclear from the article, but based on

> Since the system supports asynchronous replication, our data centers eventually become consistent. Writes are considered complete as soon as the remote data center acknowledges it.

I assume its eventually consistent (so AP).

I wish they compared why normal mysql async replication fails for them and they needed to build this though.

[thdxr → takeda]

Or it's just incredibly slow and not always available

[miohtama → damm]

It is not pointless for Uber. Please read it as a job advertisement for scalable database experts.