Comment by cmiles8
14 hours ago
This interview with an AWS leader isn’t aging well, from CBS Sunday morning:
Pogue asked, "I don't mean to give anyone ideas, but let's say I figured out that one of these unmarked buildings was an AWS data center, and I blew it up. Are you saying that it's so backed up and redundant that you probably wouldn't notice?" Wood replied, "Yeah, you wouldn't notice. I mean, we might be a bit upset, but you wouldn't notice!"
https://www.cbsnews.com/news/cloud-computing-loudoun-county-...
That is actually surprising to me. Claims like that are pretty common, they make sense and they should be true, so even though I don't really know AWS (/Backblaze/Azure/whatever) redundancy planning in enough detail, I used to trust them. It's really worrying when they outright say it will be ok, and then a week later it turns out to be not ok.
The devil is always in the details. Somehow I feel that when we offload the responsibility to some one else we get this feeling that the other person/entity would be doing full diligence and whatever else is required to carry out the job perfectly. However in reality most of the times they just do the bare minimum to pass your evaluation criteria to get the job.
That is why contracts are more than one page in length. The details matter. I can remember receiving a contract class in Afghanistan about something as simple as moving gravel. Yeah, use your imagination with that and whatever absurd cartoon like fantasy you could dream up regarding "moving gravel" is still probably less strange than the real events that occurred.
I don't write contracts for a living, at least yet, but my learning so far is:
* clear goals: where is the end point and what does the product look like once it gets there in all required details
* defined test criteria: this is where you get to sue when they fuck shit up
* measures: there must be predefined measures. These can be wildly unrealistic at the start and require changes as the work occurs, which is ok, but there must be defined performance criteria that all parties are held to before work completion. In other worlds this is rewarded with bonus targets and penalties
Especially with Amazon, who are well known for squeezing every last bit of profit from their employees, contractors etc., it doesn't really sound surprising. "Offsite backups?! Sure, you could have had that if you had found the right page in the AWS console and if you would have paid 50% extra!"
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It's funny because this applies to children cleaning home bathrooms as a Saturday chore as well.
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its also the fact that a lot of fundamental systems work in trade offs.
Do you want performance, or correctness.
Well, if you want performance you use write through caching and in the case of distributed storage: more nodes confirming the block before returning. Huge performance cost.
Outsourcing this just means someone else makes these tradeoffs, they will prioritise the general case- and they’re even more incentivised to move the needle towards things that are most visible to the end user.
In this case, performance.
You won’t notice that theres a third commit server off-site (unless that site is bombed), but you will notice slower writes- and the general case says that people will express comparative dissatisfaction with weaker performance and use it as a justification to use another provider.
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This is almost always the case. It's one of the frustrating things about the software industry; because everything is much more complicated than the customer is able to comprehend, a software company can promise anything and the customer can't actually verify.
So any software company/project which actually took the time and effort to fully handle the enormous complexity, they can't sell themselves based on that fact because every other company (who didn't invest the effort) is also claiming it and the customer has no mechanism to verify the claims until some major rare event occurs.
And most of the effort is required precisely to handle those 1% of rare situations.
Well, listen, you do know that even when the largest most ambitious and most sophisticated things are shipped, each owner of each specific part (could be many many owners) basically , to the best of their ability, prayed that nothing particularly bad happens when it’s shipped off. Truly, that’s the best a mortal human can do, pray their part doesn’t break.
So then that big thing comes to you. It’s all kind of … held together by a prayer …
Trust me I’ve worked at these big places. You wouldn’t believe how much fucking luck and grace from God is allowing you to do anything with your digital life. It’s a mindfuck of a tangled mess out there, eternities worth of written code that only God ensures works together at this point, only to get more hidden with AI.
It really is important to understand the failure modes that the durability model accounts for and what it doesn't. It only accounts for "normal" failures, like an HDD reaching end of life.
For example, you mention Backblaze. Backblaze has public posts about their durability model. They claim to use 17:20 Reed-Solomon erasure encoding. That means there are 20 shards of a blob, and you can lose 3 of them and still reconstruct the blob.
Think about that for a second. If they store 4 shards in a datacenter, that means that a loss of that one datacenter is sufficient to lose the blob, forever. That entails that blobs are sharded across a minimum of 7 data centers, or the loss of one data center might mean permanent data loss. Which one do you think is true? (In fact it's pretty clear from Backblaze's public posts that they don't shard across data centers at all, only across racks within a data center.)
Now, AWS's availability guarantee — not their durability guarantee — entails that they use a less cost-effective erasure coding ratio. S3 is designed so that your blob is available even if a whole AZ goes down, and it's well known that most AWS regions have only 3 AZs. Therefore, if you tolerate the same number of shards lost to HDD failure as Backblaze in your durability model (3), then you might need 17:30 erasure coding to get the same durability and the required availability. That means S3 is storing way more physical bytes than Backblaze — 1.76x the logical size of the blob, instead of Backblaze's 1.18x. That's more expensive, but it also gives you better availability.
Which is also why One Zone S3 is cheaper — if you don't care about the availability guarantee, S3 can do what Backblaze does and save 33% on physical bytes, and they pass on 40–50% of those savings to the customer (this is fairer than it sounds — there's more overhead than physical storage bytes).
But here's the thing. AWS has more redundancy built in than Backblaze because they make availability guarantees in addition to durability guarantees. BUT the durability model is the same, which is why Backblaze can claim equivalent durability to S3. S3 in fact has better durability — they can survive the permanent loss of an AZ without necessarily losing blobs stored there (with the exception of One Zone blobs), and Backblaze cannot. But that's not actually a factor of the durability model, which is just taking into account normal events like HDD failure. Instead, S3 has durability that's more resilient to AZ loss because of their availability model. It's a side effect that isn't actually part of the durability promise!
As far as I'm aware Backblaze stores data only within a single datacenter (for a given region). This likely made sense in their original business model of being "offsite" copy of data.
But it very much breaks down for B2 where they're now storing original data. I hope they rethink this model. You do get what you pay for. There's a reason they're cheap.
The caveat is always "if you're using the service correctly" which is not necessarily free. Meaning taking advantage of multiple geo zones, building in redundancy to your stack, etc. Like everything he said is possible if your technology stack living in AWS was designed to survive it. Everyone who has ever had the "we lost your data" email from AWS knows at the end of the day the cloud is just someone else's data center with neat provisioning tools and services.
The problem is that lots of people seem to be under the impression that they are doing it right because they are using AWS. They don't realize that AWS is a toolbox, not a 'ready made solution for redundancy against all catastrophes you are possibly exposed to'. They use that to their advantage by pricing such solutions at a level that people will either pay through the nose or will be left without recourse when AWS loses their data. It's stupid, but at the same time these beliefs are surprisingly wide spread.
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No, that quotation on the GP clearly states that AWS has enough redundancy within the same region that they will continue all services running on it if a datacenter is destroyed.
It's very clearly not about you being able to set-up redundancy for yourself.
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Amazon never said you had to mirror your data across multiple regions to prevent Amazon-caused data loss.
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> which is not necessarily free
Not just in terms of service costs, but in time and complexity. In many cases building out that complexity is complicated and difficult. And sometimes the functionality you need isn't supported in the regions you use.
Pretty much this, it’s your responsibility to use their tools to make sure your data is managed in such a way that any data destroyed is already elsewhere before the event.
It's probably a dedicated government type thing where the data is housed seperately from normal AWS
“It’s not the cloud. It’s just someone else’s computer.” - MM
Isn’t the problem that multiple datacenters in one zone were blown up?
Yes, this, and the article seems pretty clear that only "some data stored exclusively in Bahrain" is affected. Add to that the option to store data with reduced redundancy (in S3, for example), and I don't really see what the drama is about.
Amazon only claims "99.999999999% durability" per year, even for the properly replicated stuff.[0]
[0] https://docs.aws.amazon.com/AmazonS3/latest/userguide/DataDu...
> stored exclusively in
Now I'm thinking about legal/contractual rules that might force that kind of geographic risk.
I mean, logically you could have the Allowable Location send pre-encrypted backups to anywhere in the world, except (A) laws and regulations aren't always logical and (B) you still have the problem of keeping the decryption keys somewhere safe without leaving the key jurisdiction.
Multiple zones impacted.
They had nine years and more money than god to build redundancy in an unstable region.
If it's an unstable region, then it might not result in a good return, especially since a blown up data center is 100% loss.
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If they're region-locking data appropriately (i.e. for people to comply with domestic storage / gdpr-style requirements) they really can't. Bahrain is only about 300 square miles / 80k hectares.
They could, of course, open other regional data centers in other countries, or say "data in this geo zone may be in any of X, Y or Z" countries, but for the latter that pretty starkly limits some of the major customers they'd have, I would guess, and for the former, well, they have other geo zones already, so if people weren't replicating to them, I'm not sure why adding me-east-1 me-west-1 me-central-1 would fix that issue, they just wouldn't replicate there either.
They did build redundancy but most of it was bombed.
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The whole "flawless victory" thing isn't aging well either.
1. This wasn’t a strike on a single data center, it was strikes on many data centers.
2. Since that interview, AWS has started selling versions of their storage that isn’t redundant. It is not surprising that when AWS sells non-redundant storage that some data is not recoverable.
> This wasn’t a strike on a single data center, it was strikes on many data centers.
He didn't say "but if you hit many data centres then there is a problem". The premise was if you hit data centre, user won't notice, without caveat that there is a limit.
> Amazon's Matt Wood isn't worried: "If something does happen or we have a power event or there's a flood in one specific location, that data is held redundantly in other locations as well."
> Pogue asked, "I don't mean to give anyone ideas, but let's say I figured out that one of these unmarked buildings was an AWS data center, and I blew it up. Are you saying that it's so backed up and redundant that you probably wouldn't notice?"
Seems pretty silly to argue, but he certainly did say "one specific data center", and I don't think anyone even non-technical will conclude "it's safe if they all go down at once" from this statement.
That's an absurd interpretation.
There's something reassuring in this for me.
There's a lot of magic & handwaving from hyperscalers like AWS about redundancy. I always wondered about some of the engineering to make this absolutely (and literally) bullet proof. At the end of the day most of their answers when you push hard enough involved paying 2-3x to run everything across multiple zones/regions, and lots of awareness in your application to handle this.
In any case, I think it's good that when a data center blows up the data is lost. Noteworthy for future skynet situation, etc.
AWS has a history of making hand wavy explanations on the robustness of its infrastructure that were misleading at best. See comments about how regions are truly independent only for everyone to find out if us-east-1 goes down you could still be down even if you built in other regions. Those dependencies were not well documented and previously hand-waved away by AWS when it boasted about how its regions were truly independent.
Similar here, there’s a lot of detail that got hand-waved away by a sloppy “yeah we good” puff PR answer.
I suspect at this point, given the nature of the AWS org.. they actually don't even know themselves either.
> I think it's good that when a data center blows up the data is lost. Noteworthy for future skynet situation, etc.
Doesn’t really apply, because the only reason data was lost is because customers chose not to replicate it to other regions, either because of legal data residency requirements, cost, or just not bothering.
If Skynet wants to make sure it’s backed up, none of that prevents it from doing so. Although it would be amusing if Skynet was stopped by a billing alert when it tries to copy itself to another region.
aws egress fees: the real hero we didn't know we needed
AWS promises to keep data safe without requiring cross region redundancy. If you choose not to trust them that's valid but then why use them at all?
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They should have asked AI to implement the redundancy.
How would have that changed anything?
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articleAuthorId: 30dacdbc-6a8a-11e2-9d12-0018fe8a00b0
articleAuthorName: cbsnews (hidden byline)
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Is the author a human or machine? Google shows 1 result for "30dacdbc-6a8a-11e2-9d12-0018fe8a00b0" and Brave Search shows 5 results.
Clearly since the MBAs took over AWS standards are not anymore what they used to be. That marketing guy should not be talking to the press, as he does not have the skills, and if somebody happens to say...our data center we wont lose any data if we have an issue, without qualifying it will depend on what quality of service, and usage of our services you setup ...is the type of technical answer that should make a hiring interview stop at the moment.
He is also violating an enormous amount of compliance requirements, by disclosing the location of the data center, and having strange people inside making a tour. Did he vet the crew and their accompanying party? Did one of them accidentally left some kind of device within the insider perimeter? There at least one or two ISO certifications he is violating there. As customer I would be asking questions...
AWS always made very clear they wont copy your data to another region as only you know what your compliance and data residency requirements are. But at the same time they always said, its up to you to come your with your disaster recovery strategy based on your project requirements. And it has always been the case copying your critical data to another region is one of the first things on your check list.
And their Well Architected Framework and other docs make this plenty clear:
"It is a good practice to always make backups of your data, and copy these to another site (such as another AWS Region)."
Also...
"All DR strategies require that data sources are backed up within the AWS Region, and then those backups are copied to the recovery Region."
And also for single-Region / Multi-AZ architectures:
"Where possible, you should also copy data backups to another AWS Region as an additional layer of protection."
"AWS Architecture Blog — Disaster Recovery Architecture on AWS, Part II" has a whole section named "Backup to another AWS Region": "By copying your data to another Region, you can handle the largest scope of disasters."
https://aws.amazon.com/blogs/architecture/disaster-recovery-...
Or "Creating backup copies across AWS Regions" - https://docs.aws.amazon.com/aws-backup/latest/devguide/cross...
This whole thread of people literally saying , "on no I trusted them...I did not know they could lose my data", with no technical context...is the the kind of incompetence I would expect from a generation raised on vibe coding and llm prompt driven miseducation...
> That marketing guy should not be talking to the press, as he does not have the skills
They have way more skills than the technical folk in doing that
that quote is definitely making its way into a lawsuit
Yes. It's super hard to answer interviews or customer demos. Every sentence you say should include all preconditions that were said in previous answers, within the same context, because you may be quoted. You should think in live about all possible contexts in which your app might be used, and your speech should be as detailed as a contract.
Obviously here, he should have mentionned that they can recover a hit on a single data center, provided the customer chose multi-AZ hosting. That's probably why companies run their ads on "This watch is a legacy for your children" rather than any material claim.
Unless you have a synchronous like setup where you don’t acknowledge data writes unless the remote has aconowledged them first, you will lose data in case your datacenter is hit by a warhead.
Now, there are a few things to consider:
- AWS best practices recommend multiple AZs for workloads and cross-region backups for things like databases and other “stateful” data
- You have to read the fine-print on what AWS offers in terms of recovery: do they reffer to their own infrastructure when they say “you won”t notice” or your data
When Google’s Paris colocation facility was flooded and all AZs there went dark, they sent an email saying “restore from backup in another region and if we can restore your data, we will make it availbale to you”. They did not even issue credits for the downtime.
>> and all AZs there went dark,
An extraordinary statement itself that shows the difference between a proper cloud where they AZs are at least 60 to 100 miles apart...and Google or Microsoft... pretend clouds...where those AZs are just firewalls across the same data center...
All the AZs flooded simultaneously?!
How big was this flood?
Well, this is how the world found out that Google AZs are just different rooms in the same building on the same floor.
He forgot to add "if it's Multi-AZ" ;)
> "The damage to our infrastructure spanned multiple Availability Zones and exceeded what our regional and multi-AZ services are designed to withstand," AWS said in the status update
The me-south-1 (Bahrain) Region was three AZs: https://docs.aws.amazon.com/global-infrastructure/latest/reg...
multi-AZ doesn’t help against multi-AZ drones :)
black swan events.
this is one of one of those things - were in the current era either a cloud provider should provide automatic backups in another geographic zone.
if you're in us-east, then your back-ups should ideally be in eu-west + africa for redundancy.
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they should provide and option for multi-AZ with drone defenders now
But AI chatbot advised him that was the case!