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Uncommon Syncthing usecases
(lemmy.world)
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this post was submitted on 22 Nov 2023
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The phone sync client would have to remember all the files it ever sends, which could be thousands. I've never seen a sync client that works like that, they usually compare the files that are in the source and destination folders. If syncthing can do this that's really interesting.
No it doesn't.
Syncthing only needs to remember the current state of the files/folders it's syncing. Not everything it's every sync'd.
It does that by either periodically scanning the filesystem to look for changes since it last scanned (based on the file creation and modification dates that are stored in the filesystem), or it registers with the operating system to receive events when files are created, modified, or deleted.
When Syncthing notices a create, update, or delete, it pushes those changes to the receiver and then updates it's record of the filesystem state accordingly.
It also pushes whole files, not deltas. So it doesn't care how the files changed, only that they did.
Even with hundreds of thousands of files to sync this is a relatively small amount of state as it's just file paths and their create/modify dates.