iCloud to Auto-Resolve Sync Conflicts

syncconflictMobileMe's sync conflict resolver. Via BusySync

When it runs into conflicting data, Apple's upcoming iCloud service will automatically determine which is the correct one without bringing the user into it, according to Daring Fireball's John Gruber. Speaking on The Talk Show with Dan Benjamin, Gruber lays out what he believes to be iCloud's course of action in dealing with sync conflicts: (via MacStories)

In iCloud, I believe you will never be presented with [a sync conflict] dialog, no matter how much has changed in one of the instances while it was "offline". The server-side iCloud, when there seemingly is a conflict, will make a decision and it will decide which one is the best (in Apple's terms the "truth"). That is what Steve Jobs means when he says "The Truth is in the Cloud." iTunes will decide which one is right and that's it. iCloud will push that right one to any device that has this account that has a different version.

But, here's the trick – what happens if it's not the right one? On the server side, it will remember all of the other ones, almost like versioning. There will be some sort of interface like "go and look at your contacts." There will be some sort of way to say "show me previous versions and let me pick the one that is right". You pick it and push it back up into the cloud and tell it "that's the truth" and Apple will push it out.

Currently, MobileMe pops up a dialog box (shown above) forcing users to resolve conflicts, before a sync can continue.

Apple hasn't officially revealed many details about exactly how its new services are going to work, iTunes Match nor the other various bits of iCloud. Gruber claims this isn't just a theory, that he knows is sure this is how iCloud will work. We'll know more when iCloud launches this fall.

Tag: iCloud

Popular Stories

iOS 26 Battery Glass Feature

Apple Says Installing iOS 26 Might Impact Battery Life

Monday September 15, 2025 10:56 am PDT by
In the iOS 26 release notes, Apple is warning iPhone users that installing the new software might have a temporary impact on battery life, which is normal. A new support document explains that major iOS updates require background setup like indexing data and files for search, downloading new assets, and updating apps. Further, Apple says that new features could require more resources,...
AirPods Pro Firmware Feature

AirPods Pro 2 and AirPods 4 Get iOS 26 Features With New Firmware Update

Monday September 15, 2025 10:50 am PDT by
Apple today released updated firmware for the AirPods Pro 2 and the AirPods 4, introducing support for the new AirPods features that are included in iOS 26, iPadOS 26, and macOS Tahoe. The firmware has a build number of 8A356, and it replaces the current 7E93 firmware. With Apple's new software updates, the AirPods Pro 2 and the AirPods 4 support better audio quality for phone calls and...
iOS 26

iOS 26.1 to iOS 26.4: Here Are 5 New Features to Expect on Your iPhone

Tuesday September 16, 2025 11:17 am PDT by
iOS 26 was finally released on Monday, but the software train never stops, and the first developer beta of iOS 26.1 will likely be released soon. iOS 18.1 was an anomaly, as the first developer beta of that version was released in late July last year, to allow for early testing of Apple Intelligence features. The first betas of iOS 15.1, iOS 16.1, and iOS 17.1 were all released in the second ...
iOS 26 on Three iPhones

iOS 26's Liquid Glass Design Draws Criticism From Users

Wednesday September 17, 2025 2:56 pm PDT by
It's been two days since iOS 26 was released, and Apple's new Liquid Glass design is even more divisive than expected. Any major design change can create controversy as people get used to the new look, but the MacRumors forums, Reddit, Apple Support Communities, and social media sites seem to feature more criticism than praise as people discuss the update. Complaints There are a long...
Tim Cook Rainbow

Apple Reportedly Plans to Launch These 10 Products in 'Coming Months'

Sunday September 14, 2025 8:45 am PDT by
Apple's annual September event is now in the rearview mirror, with the iPhone 17, iPhone 17 Pro, iPhone 17 Pro Max, iPhone Air, Apple Watch Series 11, Apple Watch Ultra 3, Apple Watch SE 3, and AirPods Pro 3 set to launch this Friday, September 19. As always, there is more to come. In his Power On newsletter today, Bloomberg's Mark Gurman said Apple plans to release many products in the...
iOS 26 Glass Feature

iOS 26: The Top 100 New Features and Changes

Tuesday September 16, 2025 12:26 pm PDT by
Apple released iOS 26 on September 15, and it's now available for all iPhone users with a compatible device. There are a lot of changes and features to learn about, so if you want a quick, easy-to-read list that outlines what's new, we've got you covered. Design Liquid Glass design that reflects light and refracts what's underneath. It's system wide, with dynamic tab bars and toolbars...
new iphone lockscreen ios 26

iOS 26: All the New iPhone Lock Screen Customizations

Tuesday September 16, 2025 5:56 am PDT by
Apple has now made iOS 26 available to download on compatible iPhone models, and if you just installed the new software, Apple has made some changes and feature additions to the iPhone Lock Screen that you may want to check out. To download iOS 26 on your iPhone, go to Settings ➝ General ➝ Software Update, then let your device check Apple's servers for the latest software. Wait for the...

Top Rated Comments

OllyW Avatar
186 months ago
How will I know that one of my syncs didn't result in "the truth" so I need to check my versioning?

When you turn up for an appointment a day too late?
Score: 14 Votes (Like | Disagree)
arn Avatar
186 months ago
Gruber is full of it. He doesn't even understand enough computer science to know WTF he is talking about.

ARN, I know you have a crush on Gruber, but you have to start recognizing that he's just pulling stuff out of his ass most of the time.

It is pathetic how people fall for this from him time and again.... and of course, nobody goes back and notices when he gets it wrong.

Ok, let's look back then at what Gruber said and you said in 2010.

Gruber's iPhone 4 rumors (https://www.macrumors.com/2010/03/29/next-iphone-double-resolution-display-front-camera-multi-tasking/)
- A4-family CPU system-on-a-chip
- 960x640 double-resolution display
- second front facing camera
- 3rd party multitasking in iPhone 4

And where you replied with the same "Gruber is always wrong" rant: https://forums.macrumors.com/showpost.php?p=9523217&postcount=36

econgeek wrote in March, 2010:
-- Front facing camera. A perennial feature request from the mac rumor mongers that does not make much real sense.

When the new [iPhone 4] doesn't have a front facing camera, will you strike gruber from your reliable rumors list? Or will he get to slide because he was "obviously being sarcastic"?

So, let me ask you this time. If the auto-resolve sync conflicts thing turns out to be true will you add gruber to your reliable rumors list, or are you just going to keep ranting about us publishing his rumors?

arn
Score: 12 Votes (Like | Disagree)
Doctor Q Avatar
186 months ago
How will I know that one of my syncs didn't result in "the truth" so I need to check my versioning?
Score: 7 Votes (Like | Disagree)
Vegasman Avatar
186 months ago
When you turn up for an appointment a day too late?

Yup! Works like the iPhone alarm feature during a daylight savings time change. ;)
Score: 6 Votes (Like | Disagree)
Small White Car Avatar
186 months ago
Although they seem to be dabbling in guesswork I have to imagine that they're right. I can't imagine that Apple would come up with file-versioning in Lion and somehow ignore such features on the cloud side.
Score: 4 Votes (Like | Disagree)
mave1969 Avatar
186 months ago
If my secretary adds an appointment to my calendar (remotely via the office) after I've already booked something myself, it's likely her newer entry will not be "the truth" at all, and my prior appointment will be written over. I could then miss my proper appointment because I didn't "verify" it prior, and that would suck.
...sorry, got carried away there.
The bit you're missing is that with iCloud, when you book something yourself it automatically gets pushed to the calendar your secretary sees, so she never adds a conflicting appointment in the first place. The pervasive concurrency of data is going to stop a lot of these conflicts happening, so the process of resolving them is required less often, and eventually becomes unnecessary.

People worrying about whether iCloud can possibly know which is "the truth" are not seeing the wider aim of Apple, which is to eliminate the possibility of conflicts happening at all.
Score: 3 Votes (Like | Disagree)