In this blog post we'll continue on topic of operation-based CRDTs and focus on the optimizations and approach known as pure operation-based CRDTs [https://hal.inria.fr/hal-01287738/document]: how can we use them to address some of the problems…
distributed-systems
A collection of 21 posts
Operation-based CRDTs: JSON document
Today we're going to cover how to build a complex, JSON-like document CRDT. In the past, we focused on homogeneous data types like registers, sets, arrays or maps. This time we're going to combine them all and tackle some of…
HyParView: cluster membership that scales
In the past I've made an introduction to different layers of cluster protocols and presented SWIM [https://www.bartoszsypytkowski.com/make-your-cluster-swim/]: a simple and intuitive approach to cluster membership, popularized by success of tools such as Hashicorp Consul. This time…
Operation-based CRDTs: arrays (part 2)
Last time [https://www.bartoszsypytkowski.com/operation-based-crdts-arrays-1/] we were discussing how to build a Commutative Replicated Data Types operating as indexed sequences - preserving order of inserted elements - using two different data structures: Linear Sequences (LSeq) and Replicated Growable…
Operation-based CRDTs: arrays (part 1)
In this post, we'll continue onto topic of Commutative Replicated Data Types. We already mentioned [https://www.bartoszsypytkowski.com/operation-based-crdts-registers-and-sets/#sets] how to prepare first, the most basic types of collections: sets. This time we'll go take a look at…
Operation-based CRDTs: registers and sets
Last time [https://www.bartoszsypytkowski.com/operation-based-crdts-protocol/] we started our operation-based CRDTs sub-series, as we moved away from state-based CRDTs. We talked mostly about core requirements and sample implementation of RCB (Reliable Causal Broadcast) protocol, which was necessary to provide…
Operation based CRDTs: protocol
Today we'll continue a series about CRDTs, this time however we'll stray from the path of state-based CRDTs and start talking about their operation-based relatives. The major difference that we need to cover, is the center of gravity of this…
Hybrid Logical Clocks
In this blog post we'll going to talk about timestamps. But to start with we need to answer the basic question: what are we using timestamps for? Two most common cases are: 1. We want to timestamp our records so…