Category: Administration

Major data center outages: causes and consequences

Modern data centers are reliable; however, any equipment can break down from time to time. In this brief note, we have compiled the most significant incidents of 2018. The impact of digital technologies on the economy is growing, the volumes of processed information are increasing, new facilities are being built, and this is good as long as everything works. Unfortunately, the impact of data center failures on the economy has also been increasing since people started […]

CampusInsight: from infrastructure monitoring to user experience analysis

The quality of a wireless network is inherently included in the concept of service level. And if you want to meet the high demands of customers, you need not only to quickly address emerging network issues but also to anticipate the most common ones. How to achieve this? Only by tracking what is truly important in this context — user interaction with the wireless network. Network loads continue to […]

Launching Instrumentation Tests in Firebase Test Lab. Part 1: iOS Project

My name is Dmitry, and I work as a tester at MEL Science. I recently finished exploring a relatively new feature from Firebase Test Lab — specifically, instrumental testing of iOS applications using the native testing framework XCUITest. Before this, I had already tried Firebase Test Lab for Android, and I liked it very much, so I […]

Deploying applications to VM, Nomad, and Kubernetes

Hello everyone! My name is Pavel Agaletsky. I work as a team lead in the group developing the Lamoda delivery system. In 2018, I spoke at the HighLoad++ conference, and today I want to present a transcription of my report. My topic focuses on our company's experience in deploying systems and services to different environments. Starting from our prehistoric times, when we deployed all systems […]

Writing a Secure Browser Extension

Unlike the common "client-server" architecture, decentralized applications are characterized by: The absence of a need to store a database with user logins and passwords. Access information is stored solely by the users themselves, with their authenticity being verified at the protocol level. The absence of a need to use a server. The application logic can run in a blockchain network, where it is also possible to store the necessary amount of data. There are 2 […]

Windows Subsystem for Linux (WSL) version 2: what will it be like? (FAQ)

Under the cut is the translation of the published FAQ regarding details about the upcoming version 2 of WSL (author — Craig Loewen). The questions covered include: Does WSL 2 use Hyper-V? Will WSL 2 be available on Windows 10 Home? What will happen with WSL 1? Will it be deprecated? Will it be possible to run WSL 2 and other third-party virtualization tools (for example, VMWare or Virtual […]

Loading FIAS into the database on MSSQLSERVER using makeshift (SQLXMLBULKLOAD) means. How this (probably) should not be done.

Epigraph: "When you have a hammer in your hand, everything around seems like nails." A long time ago, it seems – last Friday, while wandering around the office surroundings, the wayward management got concerned that I was spending my time idly contemplating cats. "Why don't you load the FIAS, dear colleague!" said the management. "For the process of loading it seems to be […]

Another monitoring system

16 modems, 4 mobile operators = Outgoing speed 933.45 Mbps Introduction Hello! This article is about how we developed a new monitoring system for ourselves. It differs from existing ones by allowing high-frequency synchronous metric retrieval and has a very low resource consumption. The polling frequency can reach 0.1 milliseconds with synchronization accuracy of 10 nanoseconds between metrics. All binary files occupy […]

What is special about Cloudera and how to prepare it

The distributed computing and big data market, according to statistics, is growing by 18-19% per year. Thus, the question of software selection for these purposes remains relevant. In this post, we will start with why distributed computing is needed, take a closer look at software selection, discuss the application of Hadoop using Cloudera, and finally talk about hardware selection and what […]

Additional Uplinks in Intel C620 System Logic Architecture

In the architecture of x86 platforms, two currents have emerged that mutually complement each other. One version suggests moving towards integration of computational and control resources within a single crystal. The second approach advocates the distribution of responsibilities: the processor is equipped with a high-performance bus that forms a peripheral scalable ecosystem. This lays the foundation for the topology of Intel C620 system logic for high-level platforms. The fundamental difference from the previous chipset […]

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