remotely-save/docs/sync_algorithm_v3.md
2024-01-17 01:24:39 +08:00

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# Sync Algorithm V3
Drafted on 20240117.
An absolutely better sync algorithm. Better for tracking deletions and better for subbranching.
## Huge Thanks
Basically a combination of algorithm v2 + [synclone](https://github.com/Jwink3101/syncrclone) + [rsinc](https://github.com/ConorWilliams/rsinc) + (some of rclone [bisync](https://rclone.org/bisync/)). All of the later three are released under MIT License so no worries about the licenses.
## Features
Must have
1. true deletion detection
2. deletion protection (blocking) with a setting
3. transaction from the old algorithm
4. user warning show up, **new algorithm needs all clients to be updated!** (deliberately corrput the metadata file??)
5. filters
6. conflict warning
7. partial sync
Nice to have
1. true time and hash
2. conflict rename
## Description
We have _five_ input sources: local all files, remote all files, _local previous succeeded sync history_, local deletions, remote deletions.
Init run, consuming local deletions and remote deletions :
TBD
Later runs, use the first, second, third sources **only**.
TBD