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no a single word about the "data bus" they use. This would be better entitled something like "Scala crash course by a twitter system engineer"

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They don't use a global data bus AFAICT. It's all driven by rpc through finagle (i.e. thrift). Finding service endpoints is likely done through zookeeper or some equivalent.

That is correct. The service discovery is called ServerSets and is available here: https://github.com/twitter/commons/blob/master/src/java/com/...

I understand that there is finagle and also a service discovery backed by zookeeper.

I fail to understand how twitter's data stays consistent without something like linkedin's databus. Doesn't twitter manage a single point of thruth or a single version of thruth and propagate changes to secondary databases like social graph & search indexes?

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