Hacker News: DmitryOlshansky

New comment by DmitryOlshansky in "OneDrive just deleted all of my files"

DmitryOlshansky — Tue, 06 Jan 2026 17:45:28 +0000

On a related note getting my share of data back from OneDrive was a painful exercise - tons of spurious write errors I spent best part of my evening getting everything back to my filesystem. Yes remote by default was enabled without my consent.

New comment by DmitryOlshansky in "1X Neo – Home Robot - Pre Order"

DmitryOlshansky — Wed, 29 Oct 2025 09:25:25 +0000

I just wonder if it has the three laws builtin.

New comment by DmitryOlshansky in "The Burrows-Wheeler Transform"

DmitryOlshansky — Fri, 10 Oct 2025 20:50:29 +0000

And I’ve just implemented BWT and Inverse BWT in D, earlier today! https://github.com/DmitryOlshansky/compd/blob/master/source/...

New comment by DmitryOlshansky in "A new experimental Google app for Windows"

DmitryOlshansky — Wed, 17 Sep 2025 17:50:29 +0000

I guess this will be killed soon enough, like so many Google projects.

New comment by DmitryOlshansky in "Public static void main(String[] args) is dead"

DmitryOlshansky — Tue, 16 Sep 2025 08:41:50 +0000

I too adopted Scala in 2014 and was really satisfied with FP side and how it all was tied with JVM. Honestly I always felt that JVM is a nice platform with a horribly verbose “assembly” language that is Java.

Fast forward to around 2020 and I had to organize a team to build search engine in JVM. Given how hard it is to find decent Scala developer I surrendered and did this project in Kotlin. Java devs easily pick up and write sensibly FP-style even code, and builtin coroutines are cool. Even though I had to open up the internals of coroutines to get tracing to work they felt a very welcome change compared to say monadic explicit async.

So for me Kotlin is kind of watered down Scala for typical Java folks and I could tolerate it compared to perspective of writing plain Java.

New comment by DmitryOlshansky in "Introduction to Unikernel: Building, deploying lightweight, secure applications"

DmitryOlshansky — Sat, 02 Aug 2025 21:11:15 +0000

Why not full VM with JIT? Seems much easier and more compatible with apps out there.

New comment by DmitryOlshansky in "Cucumber lets you write automated tests in plain language"

DmitryOlshansky — Thu, 31 Jul 2025 14:31:01 +0000

Used cucumber as living specification for our search engine. Sooner or later we realized it was just matching a list of expected JSONs with a bunch of awkward Given, And Then mixed in. Scraped that stuff for our own Kotlin DSL, made the whole thing more flexible and faster to boot.

New comment by DmitryOlshansky in "What went wrong for Yahoo"

DmitryOlshansky — Sat, 26 Jul 2025 21:17:00 +0000

I recall the Zookeeper paper from Yahoo scientist which basically details a more useful version of Google’s chubby. I find reliability and design of Zookeeper fascinating these days cool kids use etcd mostly because of relatively complex protocol of Zookeeper (there is a few implementations but they lack the polish of Java client).

New comment by DmitryOlshansky in "The Promised LAN"

DmitryOlshansky — Thu, 24 Jul 2025 08:48:52 +0000

I recall playing Warcraft I with my friend over null modem. Kind of boutique LAN party.

New comment by DmitryOlshansky in "RFC: PHP license update"

DmitryOlshansky — Tue, 15 Jul 2025 12:21:42 +0000

Think of page tables this is essentially a table of tables of tables. I also was meh on triple pointers until I found this use case.

New comment by DmitryOlshansky in "C3 solved memory lifetimes with scopes"

DmitryOlshansky — Mon, 14 Jul 2025 09:46:27 +0000

I think there was a discussion to add SuperStack a threadlocal buffer that will be used for arena style allocation back in 2010-2011. While std wont have it I see no problem implementing one yourself.

New comment by DmitryOlshansky in "Can an email go 500 miles in 2025?"

DmitryOlshansky — Wed, 09 Jul 2025 08:19:24 +0000

Patching the binary is an option, though it’s tricky I would attempt it anyway.

New comment by DmitryOlshansky in "Async Queue – One of my favorite programming interview questions"

DmitryOlshansky — Mon, 07 Jul 2025 09:19:25 +0000

Or zookeeper for that matter.

New comment by DmitryOlshansky in "Event – Fast, In-Process Event Dispatcher"

DmitryOlshansky — Mon, 30 Jun 2025 10:11:16 +0000

> Generic: Works with any type implementing the Event interface.

Isn’t this the opposite? Generic is usually implying any type would do.

New comment by DmitryOlshansky in "Ask HN: What Are You Working On? (June 2025)"

DmitryOlshansky — Mon, 30 Jun 2025 07:19:22 +0000

A drop-in memcached replacement written in D. The end goal is Redis but memcached is simpler protocol (and less data structures;)) to test the waters.

https://github.com/DmitryOlshansky/hedgehog

New comment by DmitryOlshansky in "Sid Meier's Pirates – In-depth (2017)"

DmitryOlshansky — Tue, 03 Jun 2025 09:32:40 +0000

I remember how I caught the silver train in Cartahena, most of my pirates didn’t survive the onslaught. So when the time came to divide the plunder each pirate would get ~ -16000 gold, I immediately recognized that was 16-bit wrap around. Sadly nobody wanted me to leed the next journey so I retired as a freaking rich pirate.

New comment by DmitryOlshansky in "Waiting for Postgres 18: Accelerating Disk Reads with Asynchronous I/O"

DmitryOlshansky — Thu, 08 May 2025 18:18:55 +0000

That’s the POSIX AIO. Linux has had AIO that was only supported for direct I/O and had certain limitations making it awkward to use.

New comment by DmitryOlshansky in "Fast(er) regular expression engines in Ruby"

DmitryOlshansky — Sun, 04 May 2025 18:08:08 +0000

I wonder how std.regex of dlang would fare in such test. Sadly due to a tiny bit of D’s GC use it’s hard to provide as a library for other languages. If there is an interest I might take it through the tests.

New comment by DmitryOlshansky in "Why did Windows 7 log on slower for months if you had a solid color background?"

DmitryOlshansky — Wed, 30 Apr 2025 14:38:21 +0000

At my work they would also disable ptrace in the kernel and require you to explain why need it

New comment by DmitryOlshansky in "Four Kinds of Optimisation (2023)"

DmitryOlshansky — Thu, 17 Apr 2025 15:01:02 +0000

Python is not something I expect to see when talking about performance. Being interpreted with powerful builtins it distorts what is fast and what isn’t in a fairly unpredictable way.