5 ms·

But you have to carefully check which version is currently there before you apply the delta, to make sure it's applicable. Also make sure previous delta was ful

But you have to carefully check which version is currently there before you apply the delta, to make sure it's applicable. Also make sure previous delta was fully applied and not stopped halfway through etc etc. It really is not as trivial as you make it sound, hence the extra engineering burden mentioned in comment above.

iainmerrick 8y ago
OK, but if they're a good member of the tech community, they should put in that effort and/or charge their own customers appropriately. Not just punt on it and exploit somebody else's free service.
- codeulike 8y ago
  But then they also need to download other large files regularly. So I think their policy is to tell people to do it over wifi, and most people can do that, because their car sits in a garage or near a house all night. Seems sensible, no? Why take the risk of messing about with deltas when most customers manage fine.
- p49k 8y ago
  They are already much better members of the tech community than most car manufacturers. I have to make an appointment with my dealer and leave my car there for a few hours if I want a map update for my navigation system and I have to pay an unreasonable amount of money for it. I think what people are asking here is too much; it’s not an unrealistic expectation that someone to find wifi occasionally in order to receive free updates.
icebraining 8y ago
You already have to check if the file was correctly downloaded over Wifi and not stopped halfway or tampered with. There's no new requirement here. You do have to compare if the old file is the correct, but not only is that extremely basic (I mean, it's comparing a filename), even if you manage to muck it up, the previously mentioned check will make sure the incorrectly generated file won't be applied, since the signature won't be valid.
- codeulike 8y ago
  You're assuming each different version of this map database will have a different filename? I dont think you've thought this through. Everything in software engineering seems simple if you dont look at the details. You're saying it would be easy to do deltas. I'm saying its not as easy as you think, and secondly why should they bother when there's probably a thousand more important requirements on their to-do list right now. Thats whats real-world projects are like.
  - icebraining 8y ago
    You're assuming each different version of this map database will have a different filename? It'll have whatever Tesla wants it to have. Even if they receive the file as a binary blob, they can attach whatever metadata they want when transferring it to the car. A filename would just be what I'd use, but the specific format is irrelevant. Everything in software engineering seems simple if you dont look at the details. (...) And some actually are. But in any case, I never actually said it was simple. I rebutted specific reasons you gave. Is it complicated for other reasons? Sure, maybe, who knows.

iainmerrick 8y ago

OK, but if they're a good member of the tech community, they should put in that effort and/or charge their own customers appropriately. Not just punt on it and exploit somebody else's free service.

codeulike 8y ago
But then they also need to download other large files regularly. So I think their policy is to tell people to do it over wifi, and most people can do that, because their car sits in a garage or near a house all night. Seems sensible, no? Why take the risk of messing about with deltas when most customers manage fine.
p49k 8y ago
They are already much better members of the tech community than most car manufacturers. I have to make an appointment with my dealer and leave my car there for a few hours if I want a map update for my navigation system and I have to pay an unreasonable amount of money for it. I think what people are asking here is too much; it’s not an unrealistic expectation that someone to find wifi occasionally in order to receive free updates.

icebraining 8y ago

You already have to check if the file was correctly downloaded over Wifi and not stopped halfway or tampered with. There's no new requirement here. You do have to compare if the old file is the correct, but not only is that extremely basic (I mean, it's comparing a filename), even if you manage to muck it up, the previously mentioned check will make sure the incorrectly generated file won't be applied, since the signature won't be valid.

codeulike 8y ago
You're assuming each different version of this map database will have a different filename? I dont think you've thought this through. Everything in software engineering seems simple if you dont look at the details. You're saying it would be easy to do deltas. I'm saying its not as easy as you think, and secondly why should they bother when there's probably a thousand more important requirements on their to-do list right now. Thats whats real-world projects are like.
- icebraining 8y ago
  You're assuming each different version of this map database will have a different filename? It'll have whatever Tesla wants it to have. Even if they receive the file as a binary blob, they can attach whatever metadata they want when transferring it to the car. A filename would just be what I'd use, but the specific format is irrelevant. Everything in software engineering seems simple if you dont look at the details. (...) And some actually are. But in any case, I never actually said it was simple. I rebutted specific reasons you gave. Is it complicated for other reasons? Sure, maybe, who knows.