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P2P protocols work in many cases, but are poorly supported by many.

(see Creating User Interfaces for CRDTs). User interfaces with state managed by CRDTs

Functional Reactive Programming (FRP) is effective for synchronising.

CRDTs provide a reliable, principled foundation for P2P.

Peer-to-peer Networking for Collaboration. Have a copy of the data, without relying on cloud We discuss PushPinвЂ™s use of CRDTs inДЄllow updates from one device to be propagated to other devices that Users on different devices, and which automatically synchronise and

(CRDTs), data structures that can be concurrently updated by multiple We build upon two foundational technologies: Programming models, P2P data distribution, reliability, and usability. We approach this project with broad interests in exploring

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Industrial software development best practices and realistic user Technologies by developing an example P2P application with a mindset of To create new algorithms or protocols, but rather to evaluate existing Is investigating if and how we can develop commercial-qualityД¬ollaboration software with minimal reliance on servers. We are yet to see any mainstream applications using this approach. While various research prototypes of P2P collaboration software have P2P network should allow the same kind of real-time collaboration that Ownership, and synchronising updates through a

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Storing an authoritative copy of data on the usersвЂ™Дevices enables offline work and stronger data Indefinitely, without depending on someone paying to keep a cloud In principle, a P2P system should be able to function Peer-to-peer (P2P) application software promises to overcome these Round-trips to the server in order to load or store data there. Moreover, cloud-centric software oftenДoes not work well offline, and can be slow as the client waits for If a cloud service shuts down, users lose access to allДata stored in that service, unless some migration path to anДЄlternative service is provided. Services require ongoing maintenance by expensive 24/7 operations teams,ДЄnd they cease to exist when the organisation backing them terminates However, reliance on the cloud comes with problems: Which can be accessed through thin clients such as web browsers and Smartphone, tablet), and also allowing real-time collaboration betweenДЄt present, such multi-user, multi-device software typically relies onД¬loud services that store the authoritative copy of the usersвЂ™ data, and Synchronisation across devices belonging to the same user (e.g.В laptop, Software and data to be available on multiple devices, with In the past, software used to run on one computer.

In 7th Workshop on Principles and Practice of Consistency for Distributed Data (PaPoC вЂ™20), April 27, 2020, Heraklion, Greece. PushPin: Towards Production-Quality Peer-to-Peer Collaboration. Peter van Hardenberg and Martin Kleppmann. The original paper was presented at PaPoC вЂ™20. We identify approaches that work well in our experience, such as the functional reactive programming paradigm, and highlight areas in need of further research, such as the reliability of NAT traversal and usability challenges. In this paper we report on our experience in taking these technologies beyond research prototypes, and working towards commercial-grade P2P collaboration software. Research on distributed consistency mechanisms such as CRDTs has laid the foundation for P2P data synchronisation and collaboration. Pushpin: Towards Production-Quality Peer-to-Peer Collaboration Pushpin Towards Production-Quality Peer-to-Peer CollaborationДЇully peer-to-peer application software promises many benefits over cloud software, in particular, being able to function indefinitely without requiring servers.

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