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Comment by akkartik | Hacker News Reader

Sounds like their argument hinges on the efficacy of systems like https://eng.uber.com/intro-to-ringpop

Yes, Ringpop was reference number 8 in the article. It is interesting that https://github.com/uber/ringpop-go says: "This project is no longer under active development"

So the time of Redis has passed but the successor has passed away as well?

Basically it's been deprecated in favor of using projects that are more mature like Apache Helix (but conversely more operationally intense to get started, requires Zookeeper and a bunch of things on top if you want to use it in a non-Java setting, i.e. with Go).

I've really grown to dislike ZooKeeper. While incredibly useful, it's pretty awful. It's nearly impossible to secure in any non-trivial setup. And it's inane requirement to reserve a physical disk [1] for its transaction log is almost impossible to fulfil with virtualized hardware.

[1] From the manual:

> ZooKeeper's transaction log must be on a dedicated device.

Is this not the assumption of many SQL databases that make certain guarantees about complying with ACID? I'm not a DB expert but feels like something I've read before.

Not since the 1990s

Reading about ringpop, came across this statement

> Ringpop, a library for building cooperative distributed systems, solved some of Marketplace’s problems before its adoption in other teams at Uber and beyond. It gives the high-availability, partition-tolerant properties of distributed databases like DynamoDB or Riak to developers at the application level.

I am wondering about the need to have your app services communicate with each other (is that because these are stateful applications ?) or have I missed the point completely ?

It's to avoid the complicated routing problem (i.e. building a router microservice that sits in front of it), and encapsulate that in the service itself (by proxying internally to another part of the service after inspecting the request).

you mean like an orchestrator service ? ex: building for a uber eats system which depends on responses of systems (B, C, D..) where each of these systems have xx min SLA`s ?

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