All streams

@Tzimie Jan 28 2019 at 14:52

Monitoring System for Windows servers on pure SQL, and how I had secretly dragged it into the Production

5 min

1.5K

IT Infrastructure * Microsoft SQL Server *

A long time ago in a galaxy far, far away there was a company grown from a startup to something much bigger, but for a while the IT department was still compact and very efficient. That company hosted on prem hundreds of virtual Windows servers, and of course these servers were monitored. Even before I joined the company, NetIQ had been chosen as a monitoring solution.

One of my new tasks was to support NetIQ. The person, who worked with NetIQ before, said a lot about his experience with NetIQ, unfortunately, if I try to put it here it would be just a long line of ‘****’ characters. Soon I realized why. Steve Jobs is probably spinning in his grave looking at the interface like this:

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@gree-gorey Jan 27 2019 at 09:58

Writing yet another Kubernetes templating tool

8 min

13K

System administration * Server Administration * Python * Kubernetes * DevOps *

If you are working with Kubernetes environment then you probably make use of several existing templating tools, some of them being a part of package managers such as Helm or Ksonnet, or just templating languages (Jinja2, Go template etc.). All of them have their own drawbacks as well as advantages and we are going to go through them and write our own tool that will try to combine the best features.

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@sahsAGU Jan 25 2019 at 07:00

The VS Code Roadmap 2019 — DRAFT

5 min

Microsoft corporate blogProgramming * Visual Studio * C# * .NET *

As 2018 has come to an end, now is the time to look towards the future. We typically look out 6 to 12 months and establish topics we want to work on.

As we go we learn and our assessment of some of the topics listed changes. Thus, we may add or drop topics as we go.

We describe some initiatives as «investigations» which means our goal in the next few months is to better understand the problem and potential solutions before scheduling actual feature work. Once an investigation is done, we will update our plan, either deferring the initiative or committing to it.

As always, we will listen to your feedback and adapt our plans if needed.

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@StErMi Jan 18 2019 at 11:04

[SAP] SAPUI5 for dummies: A complete step-by-step exercise

2 min

4.8K

Website development * Programming * JavaScript * HTML *

Tutorial

Yesterday I’ve blogged about the content I’m creating for new developers that have arrived at our Techedge office in Lucca.

Teaching is something I started to love, is the natural consequence of the fact that I love to learn and love to share my knowledge. And I think that it’s important that new students or young developers have some curated content to start with, maybe with also some tip&tricks that senior has learned during their journey.

The idea behind this exercise is to cover every topic a SAPUI5 developer should know and understand.

The exercise will be available on my GitHub project openui5-exercise.

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@MATov Jan 16 2019 at 17:24

Isometric Plugin for Unity3D

9 min

10K

Unity3D * Game development *

Translation

It's a story on how to write a plugin for Unity Asset Store, take a crack at solving the well-known isometric problems in games, and make a little coffee money from that, and also to understand how expandable Unity editor is. Pictures, code, graphs and thoughts inside.

Читать дальше →

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@gnomeby Jan 15 2019 at 14:21

Things you need to know should you want to switch from PHP to Python

13 min

6.8K

ex-Wargaming corporate blogPHP * Python *

Translation

Did you ever think that one day you had got into PHP web programming too quickly?
Several years have passed already, you have gained a lot of experience and can’t think of any other ways to work with web but PHP. Perhaps, you sometimes doubt the choice you have made, but are unable to confirm your doubts here and now. At the same time, you need real examples; you want to understand the changes that may occur in particular aspects of your work.

Today I will try to answer the following question: "What if we use Python instead of PHP?".

I have asked this question myself many times. I have been using PHP for 11 years already and am a certified PHP specialist. I have mastered it so it works just the way I want. I was really puzzled by several articles that criticized PHP severely (PHP: a fractal of bad design). However, when chance came, I switched to Ruby and then to Python. Eventually, I chose the latter. Now I will try to explain how we Python guys live out there.

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@michael-filonenko Sep 1 2021 at 13:15

In-Memory Showdown: Redis vs. Tarantool

13 min

6.5K

VK corporate blogTarantool * Database Administration * High performance *

In this article, I am going to look at Redis versus Tarantool. At a first glance, they are quite alike — in-memory, NoSQL, key value. But we are going to look deeper. My goal is to find meaningful similarities and differences, I am not going to claim that one is better than the other.

There are three main parts to my story:

We’ll find out what is an in-memory database, or IMDB. When and how are they better than disk solutions?
Then, we’ll consider their architecture. What about their efficiency, reliability, and scaling?
Then, we’ll delve into technical details. Data types, iterators, indexes, transactions, programming languages, replication, and connectors.

Feel free to scroll down to the most interesting part or even the summary comparison table at the very bottom and the article.

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@MMik Mar 27 2021 at 10:14

Multiple violations of policies in RMS open letter

7 min

4.1K

Biography of geeksSocial networks and communitiesLegislation in ITGitHub * Open source *

Author: Chris Punches (@cmpunches, Silo group). License: "Please feel free to share unmodified".

The following text is an unmodified copy of now removed issue #2250 on rms-open-letter.github.io repository. The text claims multiple violations of different policies, codes of conduct and other documents in creation, content and support of the "Open letter to remove Richard M. Stallman from all leadership positions". The issue has not been addressed.

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@sismetanin Nov 5 2020 at 11:13

Toxic Comments Detection in Russian

17 min

VK corporate blogPython * Machine learning * Social networks and communities

Currently, social network sites tend to be one of the major communication platforms in both offline and online space. Freedom of expression of various points of view, including toxic, aggressive, and abusive comments, might have a long-term negative impact on people’s opinions and social cohesion. As a consequence, the ability to automatically identify and moderate toxic content on the Internet to eliminate the negative consequences is one of the necessary tasks for modern society. This paper aims at the automatic detection of toxic comments in the Russian language. As a source of data, we utilized anonymously published Kaggle dataset and additionally validated its annotation quality. To build a classification model, we performed fine-tuning of two versions of Multilingual Universal Sentence Encoder, Bidirectional Encoder Representations from Transformers, and ruBERT. Finetuned ruBERT achieved F₁ = 92.20%, demonstrating the best classification score. We made trained models and code samples publicly available to the research community.

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@alexey_zz May 7 2020 at 11:00

Bcache against Flashcache for Ceph Object Storage

11 min

3.3K

Selectel corporate blogIT Infrastructure * Server Administration * Data storage *

Fast SSDs are getting cheaper every year, but they are still smaller and more expensive than traditional HDD drives. But HDDs have much higher latency and are easily saturated. However, we want to achieve low latency for the storage system, and a high capacity too. There’s a well-known practice of optimizing performance for big and slow devices — caching. As most of the data on a disk is not accessed most of the time but some percentage of it is accessed frequently, we can achieve a higher quality of service by using a small cache.

Server hardware and operating systems have a lot of caches working on different levels. Linux has a page cache for block devices, a dirent cache and an inode cache on the filesystem layer. Disks have their own cache inside. CPUs have caches. So, why not add one more persistent cache layer for a slow disk?

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@Dabudabot Apr 28 2020 at 12:24

Windows Native Applications and Acronis Active Restore

9 min

2.2K

Acronis corporate blogDevelopment for Windows * Backup *

Translation

We continue telling you about our cooperation with Innopolis University guys to develop Active Restore technology. It will allow users to start working as soon as possible after a failure. Today, we will talk about Native Windows applications, including details on their development and launch. Under the cut, you will find some information about our project, and a hands-on guide on developing native apps.

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@Shapelez Mar 19 2020 at 15:43

Turns out internet businesses are sustainable during pandemics. Why? Home Office DNA

5 min

1.7K

Qrator Labs corporate blogPersonnel Management * IT careerHealth

“In 1665, Cambridge University closed because of the plague. Issac Newton decided to work from home. He discovered calculus & the laws of motion.”

We live in a truly remarkable moment. With the year 2020 and the COVID-19 outbreak employees all over the world are staying home for quarantine, trying their best to sustain the normal flow of life, which means continue working. And this is something new compared to all the previous infectious pandemics humanity has survived through — this time we have the Internet.

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@tterian Oct 15 2019 at 13:00

Don't forget about Open Graph

2 min

6.6K

Website development *

Tutorial

Open Graph protocol is a web standard originally developed by Facebook that turns any webpage into a graph object with title, description, image and so on. Even though there is no direct correlation between OG meta tags and improved SEO rankings, it still drives more traffic to your webpage by making it more “attractive” in social networks (Facebook, Twitter, Linkedin, etc).

An example of a link shared in Twitter that has «og:image» and «og:title».

Adding OG (and not only) meta tags into your React app

Without further due let’s jump into newly created React app with create-react-app and OG meta tags to /public/index.html. It should look like something like this:

<!DOCTYPE html>
<html>
   <head>
      <meta charSet="utf-8"/>
      <meta http-equiv="x-ua-compatible" content="ie=edge"/>
      <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"/>
      <link rel="alternate" type="application/rss+xml" href="/rss.xml"/>
      <title>Awesome App</title>
      <meta property="og:title" content="Awesome app - the best app ever" />
      <meta property="og:type" content="website" />
      <meta property="og:image" content="https://picsum.photos/id/52/1200/600" />
      <meta property="og:description" content="Describe stuff here." />
      <meta property="og:url" content="yourawesomeapp.com" />
   </head>
   <body>
      <noscript>This app works best with JavaScript enabled.</noscript>
      <div id="root"></div>
   </body>
</html>

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@worldbeater Aug 2 2019 at 19:08

Saving Routing State to the Disk in a Cross-Platform .NET Core GUI App with ReactiveUI and Avalonia

17 min

9.9K

.NET * C# * Programming * Development for Linux * Development for Windows *

Tutorial

Translation

User interfaces of modern enterprise applications are quite complex. You, as a developer, often need to implement in-app navigation, validate user input, show or hide screens based on user preferences. For better UX, your app should be capable of saving state to the disk when the app is suspending and of restoring state when the app is resuming.

ReactiveUI provides facilities allowing you to persist application state by serializing the view model tree when the app is shutting down or suspending. Suspension events vary per platform. ReactiveUI uses the Exit event for WPF, ActivityPaused for Xamarin.Android, DidEnterBackground for Xamarin.iOS, OnLaunched for UWP.

In this tutorial we are going to build a sample application which demonstrates the use of the ReactiveUI Suspension feature with Avalonia — a cross-platform .NET Core XAML-based GUI framework. You are expected to be familiar with the MVVM pattern and with reactive extensions before reading this note. Steps described in the tutorial should work if you are using Windows 10 or Ubuntu 18 and have .NET Core SDK installed. Let's get started! Source code of the app described in this tutorial is available on GitHub.

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@SvyatoslavMC Jul 25 2019 at 06:09

How to shoot yourself in the foot in C and C++. Haiku OS Cookbook

20 min

3.1K

PVS-Studio corporate blogOpen source * C++ * C *

The story of how the PVS-Studio static analyzer and the Haiku OS code met goes back to the year 2015. It was an exciting experiment and useful experience for teams of both projects. Why the experiment? At that moment, we didn't have the analyzer for Linux and we wouldn't have it for another year and a half. Anyway, efforts of enthusiasts from our team have been rewarded: we got acquainted with Haiku developers and increased the code quality, widened our error base with rare bugs made by developers and refined the analyzer. Now you can check the Haiku code for errors easily and quickly.

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@kagetoki Jul 5 2019 at 09:02

Fighting complexity in software development

31 min

3.5K

.NET * C# * F# * ООP *

What's this about

After working on different projects, I've noticed that every one of them had some common problems, regardless of domain, architecture, code convention and so on. Those problems weren't challenging, just a tedious routine: making sure you didn't miss anything stupid and obvious. Instead of doing this routine on a daily basis I became obsessed with seeking solution: some development approach or code convention or whatever that will help me to design a project in a way that will prevent those problems from happening, so I can focus on interesting stuff. That's the goal of this article: to describe those problems and show you that mix of tools and approaches that I found to solve them.

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@o6CuFl2Q Jun 25 2019 at 14:42

How to speed up LZ4 decompression in ClickHouse?

23 min

18K

Яндекс corporate blogBig Data * C++ * Open source * High performance *

When you run queries in ClickHouse, you might notice that the profiler often shows the LZ_decompress_fast function near the top. What is going on? This question had us wondering how to choose the best compression algorithm.

ClickHouse stores data in compressed form. When running queries, ClickHouse tries to do as little as possible, in order to conserve CPU resources. In many cases, all the potentially time-consuming computations are already well optimized, plus the user wrote a well thought-out query. Then all that's left to do is to perform decompression.

So why does LZ4 decompression becomes a bottleneck? LZ4 seems like an extremely light algorithm: the data decompression rate is usually from 1 to 3 GB/s per processor core, depending on the data. This is much faster than the typical disk subsystem. Moreover, we use all available CPU cores, and decompression scales linearly across all physical cores.

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@cerg2010cerg2010 Apr 12 2019 at 12:05

Checking rdesktop and xrdp with PVS-Studio

6 min

1.2K

PVS-Studio corporate blog*nix * C * C++ * Open source *

This is the second post in our series of articles about the results of checking open-source software working with the RDP protocol. Today we are going to take a look at the rdesktop client and xrdp server.

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@Shapelez Apr 11 2019 at 19:18

Bad news, everyone! New hijack attack in the wild

9 min

5.6K

Qrator Labs corporate blogInformation Security * Network technologies *

On March 13, a proposal for the RIPE anti-abuse working group was submitted, stating that a BGP hijacking event should be treated as a policy violation. In case of acceptance, if you are an ISP attacked with the hijack, you could submit a special request where you might expose such an autonomous system. If there is enough confirming evidence for an expert group, then such a LIR would be considered an adverse party and further punished. There were some arguments against this proposal.

With this article, we want to show an example of the attack where not only the true attacker was under the question, but the whole list of affected prefixes. Moreover, it again raises concerns about the possible motives for the future attack of this type.

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@ZeroToOneSearch Mar 14 2019 at 14:29

How to land a job in Germany for IT professionals

3 min

9.1K

IT career

From sandbox

At my agency we work a lot with international candidates and German companies. So, I wanted to write a small essay about the visa issues because often they will influence your chances of landing a job heavily. Since I work mostly with German market, I will talk about the processes in Germany, the processes may and probably are different in other EU countries. Hopefully the information will be helpful and will give you some clarity.

As all of you know, nowadays there is a big demand for experienced IT professionals in almost all EU countries. When I say experienced I mean 3+ years of experience. Companies are adjusting their teams to accept English speaking colleagues from around the globe, coming up with different perks to smooth up the relocation process and in general the IT world is becoming predominantly English speaking. Germany government understanding the demand by the industry has made the process quite fast and straightforward. I expect even easier process to be implemented in the upcoming year or two.

Visa sponsorship

Companies in Germany do not sponsor visas like in other countries, there is no such a term here. Companies either hire non-EU candidates or not. The decision is strictly an internal decision and is not influenced by any quotas, permissions etc. If you get a job contract from a German company (be it a big conglomerate or a small startup) you have a right to apply for the work visa.

Do I need a university degree?

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