Why I love databases
I'm glad he loves databases, databases have been the bane of my existence.However, the torment they have given me has also lead to a similar fascination - and now I'm writing my own database! So I've become very familiar with the topics he writes on, and they are very good points for anybody interested in the subject.Why would I write my own database? Because databases are hard, and I am determined to make them easy (even if that means me sacrificing years of my life into doing all this crazy research). Check out http://github.com/amark/gun !- CAP Theorem, he is correct, P cannot be sacrificed. GUN is AP with eventual consistency. The beauty of this, though, is that you can always build strong consistency out of eventual consistency (it just requires knowing X amount of peers in advance, and doing a trivial lock until you've heard back from all of them - in fact, I do this in one of the example apps) but you can never go from strong consistency down to an eventually consistent system.- Distributed Systems, this is incredibly incredibly important. I cannot repeat this enough times, there should be no "master" or "single source of truth" in any database. If there is, you're going to have a nightmare of a time being woken up at 3am to fix it when it crashes (my personal experience with other databases). Why? Because single points of failures will fail, centralized systems suck. Solution: Distribute and Decentralize! We make this easy for you.- Correctness vs Efficiency, as he says, Paxos is difficult - all of them, Raft, Quorum, leader election, etc. DO NOT USE THEM unless you are Google, Amazon, Walmart, or what not. Even then, do not use them. Instead, I've solved this challenging problem by developing a new Conflict Resolution system that (very poorly) can be summarized as Vector Clocks + Timestamps, you get the advantages of both without either of their weaknesses. What his means is that data integrity is guaranteed because every machine is using a deterministic algorithm, without any extra gossip between machines. Let me repeat, you'll get the same result on every machine, eventually consistent, without any multi-machine coordination. This means every peer is a master, and that is awesome, even if you are running it on an ephemeral server/cloud - completely resilient to failures, terminations, restarts, and reboots.- Empowering the App. Yes. Databases should serve you, not the other way around. Answers to his questions about abstractions are at http://github.com/amark/gun .- Operational Challenges. This is where I diverge from him. If something seems wrong, like things suddenly becoming slow, you can easily just restart it without any damage/harm/failure occurring. And then you can look through your logs, taking your time, to see what went wrong.- Basic Building Blocks. Because GUN is a graph database, you get key-value like access, as well as documents and relational styles. That is because mathematically graphs are the superset of relational algebra and hierarchy trees.Happy to answer any questions!