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fh973

1,699 karma · joined October 5, 2008

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fh973··on EU-wide maximum limit of €10K for cash payments
How do you pay for a used car?
fh973··on Amazon is said to plan to lay off thousands of employees
Amazon is surely aware of the aftermath of Google's accidental Wireless network war-driving.

While absence is hard to prove, an intentional or unintentional data collection beyond what is stated in their policies is highly unlikely.

fh973··on Which face is real?
Ears and teeth artifacts, if present.

If the head is rotated slightly, the faces, especially the cheeks are getting slightly distorted in the artificial images.

fh973··on Patch OpenSSL on November 1 to avoid “critical” security vulnerability
Couldn't they be a bit more specific? No software uses all of openssl, there is software that uses it for other things than server-side TLS.
fh973··on Tesla Vision Update: Replacing Ultrasonic Sensors with Tesla Vision
Yes, it parallel parks perfectly reliable, in gaps that intuitively feel too small.
fh973··on Tesla Vision Update: Replacing Ultrasonic Sensors with Tesla Vision
My 10 year old VW Touran can do it reliably, with only ultrasonic sensors.
fh973··on Understanding Google’s File System (2020)
Only the namespace is hard to scale horizontally because of rename; the rest of POSIX does not have inherent scalability issues. For the vast majority of applications, namespace scalability is not an issue (there are only few single applications that store billions of files/objects), so in most cases it's mostly a system management topic.

If you go full object storage semantics (no in-place updates, to appends, no rename, ..) you're pushing the problem to the application layer. Experience at Google was that that's not a good place to have it, because application developers are usually not good at solving distributed systems problems. This lesson learned is the part of the Bigtable (no transactions) to Megastore (application layer transactions on top of Bigtable) to Spanner (transactions built-in) journey.

So yes, of course there are inherent hard trade-offs, but dropping strong semantics from the storage layer by using an object store instead of a file system is usually not a good idea.

fh973··on Ask HN: Who is hiring? (September 2022)
QUOBYTE Engineering | Berlin, Germany | Full-time | ONSITE | https://www.quobyte.com/

At Quobyte, we are working on the Data Center File System (DCFS), a highly scalable and fault-tolerant software storage system built around a parallel file system core. Customers use Quobyte DCFS for ML and HPC clusters in industry and academia, k8s and OpenStack infrastructures, streaming, web mail, post production, origin and CGI clusters, and as a scalable backend for SaaS products. There are Quobyte DCFS clusters which span thousands of machines and crunch 100s of GB/s!

Under the hood, DCFS is a full-stack storage system, written in Java and C++. The engineering work covers everything from kernel development over our own replicated database system design to distributed algorithms (Paxos!) and performance. In short: lots of real-world challenging and fun problems! We work as a highly efficient engineering team, and do mandatory code reviews, lots of unit and integration testing,

Engineering:

* Customer Success Engineer - Berlin, Germany

* Software Engineer / Distributed Database - Berlin, Germany

* Software Engineer / File System Metadata - Berlin, Germany

* Software Engineer / IO Path / C++ - Berlin, Germany

For detailed job descriptions please and application process, please visit https://www.quobyte.com/company/eng-careers or write to work at quobyte.com.

fh973··on Understanding Google’s File System (2020)
Open source is unlikely, because such a thing is expensive to develop and there is no business model to support that (commercially or as a story for VCs).

At Quobyte we're building a scalable fault-tolerant file system (POSIX, so it has a different architecture and constraints), but it's closed source.

fh973··on Understanding Google’s File System (2020)
Plus all data is stored in the same format (protobufs in recordio or sstables), so was very easy to access.
fh973··on Autonomous driving BMW causes fatal accident
BMW went on record saying it was not an autonomous test vehicle.
fh973··on Modern HDDs have gotten somewhat better
They are actually presented as two drives, so in order to benefit you have to overlay a RAID 0 or some other form of striping.
fh973··on Thoughts on OKRs
OKRs are also a tool for communicating priorities and agendas in all directions of the hierarchy.

I think they work reasonably well for that. They're succinct and the key results force them to be grounded on some reality that people can relate to.

fh973··on Mercedes-Benz says Level 3 self-driving option ready to roll
This point about Tesla has been made frequently in this discussion. I still wonder: how does Tesla store any meaningful video data in customer vehicles and transfer it?

I know that other vendors have a hard time putting the necessary fast storage in the trunk and get the data off with 100G cables in the garage.

fh973··on Ask HN: Who is hiring? (May 2022)
QUOBYTE Engineering | Berlin, Germany | Full-time | ONSITE | https://www.quobyte.com/

At Quobyte, we are working on the Data Center File System (DCFS), a highly scalable and fault-tolerant software storage system built around a parallel file system core. Customers use Quobyte DCFS for ML and HPC clusters in industry and academia, k8s and OpenStack infrastructures, streaming, web mail, post production, origin and CGI clusters, and as a scalable backend for SaaS products. There are Quobyte DCFS clusters which span thousands of machines and crunch 100s of GB/s!

Under the hood, DCFS is a full-stack storage system, written in Java and C++. The engineering work covers everything from kernel development over our own replicated database system design to distributed algorithms (Paxos!) and performance. In short: lots of real-world challenging and fun problems! We work as a highly efficient engineering team, and do mandatory code reviews, lots of unit and integration testing,

Engineering:

* Customer Success Engineer - Berlin, Germany

* Software Engineer / Distributed Database - Berlin, Germany

* Software Engineer / File System Metadata - Berlin, Germany

* Software Engineer / IO Path / C++ - Berlin, Germany

For detailed job descriptions please and application process, please visit https://www.quobyte.com/company/eng-careers or write to work at quobyte.com.

fh973··on Distributed Systems Shibboleths
The term you're looking for is "software rejuvenation".

Jokes aside, there is even a body of research papers around this subject, if you need some backing.

fh973··on Ask HN: Who is hiring? (April 2022)
QUOBYTE Engineering | Berlin, Germany | Full-time | ONSITE | https://www.quobyte.com/

At Quobyte, we are working on the Data Center File System (DCFS), a highly scalable and fault-tolerant software storage system built around a parallel file system core. Customers use Quobyte DCFS for ML and HPC clusters in industry and academia, k8s and OpenStack infrastructures, streaming, web mail, post production, origin and CGI clusters, and as a scalable backend for SaaS products. There are Quobyte DCFS clusters which span thousands of machines and crunch 100s of GB/s!

Under the hood, DCFS is a full-stack storage system, written in Java and C++. The engineering work covers everything from kernel development over our own replicated database system design to distributed algorithms (Paxos!) and performance. In short: lots of real-world challenging and fun problems! We work as a highly efficient engineering team, and do mandatory code reviews, lots of unit and integration testing,

Engineering:

* Customer Success Engineer - Berlin, Germany

* Software Engineer / Distributed Database - Berlin, Germany

* Software Engineer / File System Metadata - Berlin, Germany

* Software Engineer / IO Path / C++ - Berlin, Germany

* QA / Test Engineer - Berlin, Germany

* Student in Engineering - Berlin, Germany

For detailed job descriptions please and application process, please visit https://www.quobyte.com/company/eng-careers or write to work at quobyte.com.

fh973··on Ask HN: Who is hiring? (March 2022)
QUOBYTE Engineering | Berlin, Germany | Full-time | ONSITE | https://www.quobyte.com/

At Quobyte, we are working on the Data Center File System (DCFS), a highly scalable and fault-tolerant software storage system built around a parallel file system core. Customers use Quobyte DCFS for ML and HPC clusters in industry and academia, k8s and OpenStack infrastructures, streaming, web mail, post production, origin and CGI clusters, and as a scalable backend for SaaS products. There are Quobyte DCFS clusters which span thousands of machines and crunch 100s of GB/s!

Under the hood, DCFS is a full-stack storage system, written in Java and C++. The engineering work covers everything from kernel development over our own replicated database system design to distributed algorithms (Paxos!) and performance. In short: lots of real-world challenging and fun problems! We work as a highly efficient engineering team, and do mandatory code reviews, lots of unit and integration testing,

Engineering:

* Software Engineer / Distributed Database - Berlin, Germany

* Software Engineer / File System Metadata - Berlin, Germany

* Software Engineer / IO Path / C++ - Berlin, Germany

* QA / Test Engineer - Berlin, Germany

For detailed job descriptions please and application process, please visit https://www.quobyte.com/company/eng-careers or write to work at quobyte.com.

fh973··on Ask HN: Who is hiring? (February 2022)
QUOBYTE Engineering | Berlin, Germany | Full-time | ONSITE | https://www.quobyte.com/

At Quobyte, we are working on the Data Center File System (DCFS), a highly scalable and fault-tolerant software storage system built around a parallel file system core. Customers use Quobyte DCFS for ML and HPC clusters in industry and academia, k8s and OpenStack infrastructures, streaming, web mail, post production, origin and CGI clusters, and as a scalable backend for SaaS products. There are Quobyte DCFS clusters which span thousands of machines and crunch 100s of GB/s!

Under the hood, DCFS is a full-stack storage system, written in Java and C++. The engineering work covers everything from kernel development over our own replicated database system design to distributed algorithms (Paxos!) and performance. In short: lots of real-world challenging and fun problems! We work as a highly efficient engineering team, and do mandatory code reviews, lots of unit and integration testing,

Engineering:

* Software Engineer / Distributed Database - Berlin, Germany

* Software Engineer / File System Metadata - Berlin, Germany

* Software Engineer / IO Path / C++ - Berlin, Germany

* QA / Test Engineer - Berlin, Germany

For detailed job descriptions please and application process, please visit https://www.quobyte.com/company/eng-careers or write to work at quobyte.com.

fh973··on Germany is closing half of its reactors before the end of the year
Interestingly the energy consumption from renewables is at 43%, ie. considerably lower than production. I guess the difference is accounted for by the exports at peak wind/sun at the expense of other sources. Probably french nuclear plants as some other poster here noted, ie. Germany takes the cream of the top and lets others provider the expensive base load or just burns dirty lignite and coal.

[1] https://www.cleanenergywire.org/news/renewables-cover-43-ger...

fh973··on Technology Behind the Lilium Jet
However, Volocopter seems to be further with their product development, while there are serious doubts if the Lilium concept works at all.
fh973··on Technology Behind the Lilium Jet
It might actually be too good to be true. The German magazine Aerokurier is citing experts that seem to have doubts about feasibility [1].

The category is called air taxis, other competitors are Volocopter and Archer, with different concepts.

[1] https://topgear-autoguide.com/category/sports-car/futuristic...

fh973··on Technology Behind the Lilium Jet
Be aware that you are usually looking at prototypes, not available products.

Currently its mostly another set of startups to invest in. They might look attractive to VCs because they're ambitious, require lots of capital, and the technical feasability of a specific approach is complex enough to find merits in. The jury is still out if any of them are actually viable from a technology and economic perspective.

Lilium's approach specifically has been publicly critized by aviation experts to not be make sense when looking at the basic physics.

fh973··on Go does not need a Java-style GC
Does object pooling still make sense for direct ByteBuffers nowadays?
fh973··on The popularity of e-bikes isn’t slowing down
> ... and have the potential to transform urban transit.

Not in Germany. Biking is and will stay irrelevant for daily transport as long as the infrastructure is a joke. Electric propulsion isn't the missing link.

Interestingly you'll find holiday areas that have biking infrastructure packed with older people on e-bikes.

fh973··on On Receiving my Certificate of Loss of Nationality
In my experience, US tax residency (as a solely German citizen) is enough for German and Swiss banks to cancel services. So dual citizenship likely won't help.

You may misrepresent your tax status towards the bank, but I'd assume that takes you on risky grounds, legally.

fh973··on Intellectuals urge Germany to keep nuclear plants online
No, parent is correct. The Atomausstieg was initiated under Schroeder's chancellorship. See for example Wikipedia if you doubt it.
fh973··on Leonardo, the Bipedal Robot, Can Ride a Skateboard and Walk a Slackline
Generally, ducted propellers are more efficient.

And yes, these blades are effectively rotating knives. Even small drone motors and propellers are very dangerous as the motors have a lot of power and high RPM, and the more high-end ones are made of CFK and have sharp edges. As these four do not only lift a drone, but a whole robot frame, I'd assume they'd easily cut through a finger.

fh973··on Women are nearly half of new gun buyers, study finds
Actually getting a fishing permit in Germany is quite an undertaking. The theoretical exam is based on a catalog of several hundred questions.
fh973··on Ask HN: Who is hiring? (September 2021)
QUOBYTE Engineering | Berlin, Germany | Full-time | ONSITE | https://www.quobyte.com/

At Quobyte, we are working on the Data Center File System (DCFS), a highly scalable and fault-tolerant software storage system built around a parallel file system core. Customers use Quobyte DCFS for ML and HPC clusters in industry and academia, k8s and OpenStack infrastructures, streaming, web mail, post production, origin and CGI clusters, and as a scalable backend for SaaS products. There are Quobyte DCFS clusters which span thousands of machines and crunch 100s of GB/s!

Under the hood, DCFS is a full-stack storage system, written in Java and C++. The engineering work covers everything from kernel development over our own replicated database system design to distributed algorithms (Paxos!) and performance. In short: lots of real-world challenging and fun problems! We work as a highly efficient engineering team, and do mandatory code reviews, lots of unit and integration testing,

Engineering:

* Software Engineer / Distributed Database - Berlin, Germany

* Software Engineer / File System Metadata - Berlin, Germany

* Software Engineer / IO Path / C++ - Berlin, Germany

* QA / Test Engineer - Berlin, Germany

For detailed job descriptions please and application process, please visit https://www.quobyte.com/company/eng-careers.

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