Building reliable (and fast) directory sync

The author of Firezone, an open-source, highly-available, and secure remote access platform, shares their experience building a reliable and fast directory sync system. They focus on the challenges of syncing directories between multiple servers, including issues with network partitions, node failures, and data inconsistencies. The author discusses the use of a client-server architecture and the implementation of a distributed lock manager to ensure consistency across nodes. They also highlight the importance of testing and debugging in a multi-node setup, using tools like `docker-compose` and `pytest`. The author concludes that building a reliable directory sync system requires careful consideration of network partitions, node failures, and data consistency, and that their approach can be applied to similar use cases.