What causes data rollbacks

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1

What causes player’s data to get rolledback when leaving and rejoining

I have a game and the players get tped to universes from a lobby but when going back to old lobbies they rollback

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2

The primary reason is caching. Sometimes datastore queries cache on the server they were made in to reduce queries to the database directly which results in out-of-date data being returned to you.

ProfileService does not have caching issues which makes it very good for universe-wide data management because of its use of UpdateAsync, which is always guaranteed to ultimately find you the most up-to-date data saved to a key.

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3

Is there any solutions without using profile service?
Would adding a value that goes up everytime your data saves work, then comparing it to whats returned from update async

4

You can honestly just use this code to fetch data without it caching:

-- DataStore is your datastore object from DSS:GetDataStore() --
local data
DataStore:UpdateAsync(key_goes_here, function(loaded)
    data = loaded
    return nil -- Returning nil in updateasync just cancels your update. This shouldn't deplete your Set budget (I think?). --
end)
print("Data has been loaded!")

Then you can use the data variable to use your data.
Disclaimer: I’m not sure if UpdateAsync gives you back nil if your callback function cancels the update so that’s why I don’t just say local data = DataStore:UpdateAsync...

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