Распределенный blockchain процессинг / Алексей Трошичев (QiWi, Rakuten)
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Проблема race condition в распределенных системах и существующие способы решения. Какие системы требуют строгой консистентности и почему? Что такое blockchain, как сделать процесс его создания распределенным и как на базе него построить масштабируемую систему учета. Горизонтальное масштабирование мультимастера до сотни узлов со строгой консистентностью без линейной потери скорости изменений.
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В докладе я расскажу о следующем:
+ почему тема доклада не оговорка, а абсолютно реальная вещь;
+ что можно извлечь из результатов теста помимо «да/нет»;
+ в каких случаях «количество» = «качество»;
+ когда «один в поле не воин»;
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+ как избежать случайностей в результатах;
+ «буря в стакане» или масштабируем highload в docker/openvz;
+ почему фиксация запросов в тестах приводит к фиксации сервиса на продакшене;
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Мониторинг должен помочь быстро понять, в каком сервисе проблема, а, может, даже показать причину проблемы.
Я расскажу и покажу на примере hh.ru, как покрыть мониторингом все слои инфраструктуры:
- client-side метрики;
- метрики с фронтендов (логи nginx);
- сеть (что можно добыть из TCP);
- приложение (логи);
- метрики базы данных (postgresql в нашем случае);
- операционная система (cpu usage тоже может пригодиться:).
«Секретные» технологии инвестиционных банков / Алексей Рагозин (Дойче Банк)
Как правило, такое базовое ПО, как языки программирования, системы управления базами данных, брокеры сообщений, используется в разных индустриях и не имеет ярко выраженной бизнес-специализации. Java, Python, MySQL и не только находят применение повсюду, начиная с больших корпораций, заканчивая стратапами и видеоиграми.
Тем не менее, встречаются исключения. В докладе пойдёт речь о технологиях, получивших распространение в инвестиционных банках и не слишком известных за их пределами. Хотя прямого отношения к торговле финансовыми инструментами сами по себе эти технологии не имеют.
Тезисы - http://www.highload.ru/2015/abstracts/1888.html
Blockchain Investment Potential
This document discusses the potential of blockchain investments and services. It outlines several blockchain investment funds and products, including decentralized investment services, blockchain asset management funds, and blockchain traded funds. It argues that blockchains enable new forms of programmable assets and organizations that could disrupt traditional finance, law, and business models. Blockchain investments are presented as a major opportunity since they enable technologies like smart contracts, decentralized autonomous organizations, and new models for entities like Uber or corporations.
Язык Lua — секреты производительности / Ник Заварицкий (Mail.ru)
Lua — высокоуровневый язык, похожий на Python/JS, но существенно более простой. Он гибкий и при этом очень быстрый.
Многие слышали про OpenResty. Это решение для разработки Nginx модулей на Lua. Cloudflare, крупнейший CDN/anti-DDOS провайдер, как раз работает на OpenResty.
У нас была задача валидации данных на соответствие схеме; мы переписали валидацию с Си на Lua и получили ускорение в 4 раза (за счет JIT-компиляции).
Что будет в докладе:
* краткое введение в язык Lua;
* как работает трассирующий JIT-компилятор Lua;
* как писать быстрый код, искать и устранять проблемы с производительностью;
* наш опыт: как мы ускорились в 4 раза, переписав валидацию с Си на Lua.
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Небольшая лекция после кинопоказа фильма The Singularity Film в Музее Москвы в гостях у Курилке Гутенберга и Образовача
CoinFest-2015-Moscow
Презентация для CoinFest-2015-Mocow на тему ресурсно-репутационной технологии и будущего
Управление производительностью на базе HP Performance Center. Опыт Альфа-банк...
Альфа-Банк основан в 1990 году, является универсальным банком, осуществляющим все основные виды банковских операций, включая обслуживание частных и корпоративных клиентов, инвестиционный банковский бизнес. Одним из основных принципов стратегии развития Альфа-Банка является привлечение и удержание клиентов за счет предоставления финансовых услуг высочайшего качества и комфортности. В соответствии с этой бизнес-стратегией существует значительный внутренний запрос на высокопроизводительные гибкие ИТ-решения для бизнеса и процесс контроля и управления производительностью этих ИТ-решений. Мы называем этот процесс процессом управления мощностями (capacity management или performance management).
Тезисы - http://www.highload.ru/2015/abstracts/1968.html
Строим сервисы на базе Nginx и Tarantool / Василий Сошников, Андрей Дроздов (...
Слушатели этого доклада получат представление о том, как построить отказоустойчивое, быстрое, простое и легко масштабируемое решение на базе Nginx и Tarantool.
Коротко о главном:
+ Обзор внутреннего устройства шардинга в Tarantool.
+ Обзор Tarantool upstream модуля для Nginx.
+ Результаты нагрузочного тестирования Tarantool шардинга в связке с Nginx модулем.
+ Live-demo: распределенное отображение графа категорий Wikipedia в СУБД Tarantool с единой точкой входа и возможностью реалтайм поиска по категориям.
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Многие современные высоконагруженные системы построены с использованием очередей. Не является исключением и внутренний сервис обработки OAuth токенов, который создала наша команда. Исключением является то, что и в качестве основного хранилища, и в качестве всех очередей используется один и тот же продукт - Tarantool. Более того, мы поставили себе амбициозную цель по отказоустойчивости - полную доступность сервиса, когда уходят любые два из трёх датацентров, и успешно её достигли.
При решении мы столкнулись с массой интересных инженерных задач и в нашем докладе мы расскажем вам о том, какие технологии и подходы использовались. В частности, рассмотрим более детально такие вещи, как:
- создание deadline очереди и проблемы, с ней связанные;
- создание кольцевой очереди;
- интеграция между собой шардинга, Raft и очередей;
- как мы победили split brain ;)
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Bruno Lowagie (iText) #cfoconferenz
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Blockchain technology
This is the presentation by me Navin which is to be given tomorrow i.e 21 Feb 2017
Lets see what happens!! good luck to me :P
Blockchain
Blockchain technology is currently taking over the world with its amazing features. This presentation covers all you need to know about the basics of blockchain technology with beautiful animations
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The project deals about how blockchain works, proof-of-work and merkle tree hash function. The project also tries to explain how the bitcoin uses ECDSA algorithmt power the cryptography.
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The document provides an overview of a blockchain conference agenda with the following key points:
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- It defines participants, transactions, and contracts on blockchains. Participants are members with identities and roles. Transactions are asset transfers between participants. Contracts set conditions for transactions.
- It explains some core concepts of blockchains including that they are distributed secure logfiles, how they provide transparency and robustness without central control, and how mining and proof-of-work consensus keeps the network secure.
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Blockchain fundamentals
The document discusses the blockchain technology. It begins with an agenda that covers blockchain basics, problems it solves, what blockchain is, and how it works under the hood. It then discusses key concepts like how blockchain provides transparency without needing third-party verification, uses cryptography and distributed ledgers, works through a process of validation and consensus, and involves miners who are compensated for adding blocks. The document also covers hashing, Merkle trees, smart contracts, and provides resources for further learning about blockchain technology.
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Зал «Кейптаун», 8 ноября, 17:00
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Количество внутренних заказчиков тех или иных доработок в какой-то момент выросло настолько, что разработчики стали узким местом. Мы внедрили культуру разработки, которую можно условно назвать "внутренним open-source", сохранив за собой контроль над архитектурой и качеством проекта, но позволив разрабатывать новые фичи всем желающим.
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Подробно о том, как Causal Consistency реализовано в MongoDB / Михаил Тюленев...
HighLoad++ 2017
Зал «Мумбай», 8 ноября, 18:00
Тезисы:
http://www.highload.ru/2017/abstracts/2836.html
При использовании Eventually Consistent распределенных баз данных нет гарантий, что чтение возвращает результаты последних изменений данных, если чтение и запись производятся на разных узлах. Это ограничивает пропускную способность системы. Поддержка свойства Causal Consistency снимает это ограничение, что позволяет улучшить масштабируемость, не требуя изменений в коде приложения.
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HighLoad++ 2017
Зал «Мумбай», 8 ноября, 16:00
Тезисы:
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Аудитория Одноклассников превышает 73 миллиона человек в России, СНГ и странах дальнего зарубежья. При этом ОК.ru - первая социальная сеть по просмотрам видео в рунете и крупнейшая сервисная платформа.
Качественный и количественный рост DDoS-атак за последние годы превращает их в одну из первоочередных проблем для крупнейших интернет-ресурсов. В зависимости от вектора атаки “узким” местом становится та или иная часть инфраструктуры. В частности, при SYN-flood первый удар приходится на систему балансировки трафика. От ее производительности зависит успех в противостоянии атаке.
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HighLoad++ 2017
Зал «Мумбай», 8 ноября, 15:00
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http://www.highload.ru/2017/abstracts/3008.html
Никогда не было и вот снова случилось! Компания Google в результате перенаправления трафика сделала недостпуными в Японии несколько тысяч различных сервисов, большинство из которых никак не связано с самой компанией Google. Однако, подобные инциденты происходят с завидной регулярностью, вот только не всегда попадают в большие СМИ. У таких инцидентов могут быть разные причины, начиная от ошибок сетевых инженеров и заканчивая государственным регулированием.
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HighLoad++ 2017
Зал «Мумбай», 8 ноября, 14:00
Тезисы:
http://www.highload.ru/2017/abstracts/2925.html
Облака и виртуализация – современные тренды развития IT-технологий. Операторы связи строят свои TelcoClouds на стандартах NFV (Network Functions Virtualization) и SDN (Software-Defined Networking). В докладе начнем с основ виртуализации, далее разберемся, для чего используются NFV и SDN, потом полетим к облакам и вернемся на землю для решения практических задач!
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HighLoad++ 2017
Зал «Мумбай», 8 ноября, 10:00
Тезисы:
http://www.highload.ru/2017/abstracts/3045.html
Как мы заставили Druid работать в Одноклассниках.
«Druid is a high-performance, column-oriented, distributed data store» http://druid.io.
Мы расскажем о том, как, внедрив Druid, мы справились с ситуацией, когда MSSQL-based система статистики на 50 терабайт стала:
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- нестабильной: в час пик статистика отставала до получаса (теперь ничего не отстает);
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HighLoad++ 2017
Зал «Рио-де-Жанейро», 8 ноября, 18:00
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http://www.highload.ru/2017/abstracts/2905.html
Прошло более года с того момента, как Microsoft выпустила первую версию своего нового фреймворка для разработки web-приложений ASP.NET Core, и с каждым днем он находит все больше поклонников. ASP.NET Core базируется на платформе .NET Core, кроссплатформенной версии платформы .NET c открытым исходным кодом. Теперь у С#-разработчиков появилась возможность использовать Mac в качестве среды разработки, и запускать приложения на Linux или внутри Docker-контейнеров.
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HighLoad++ 2017
Зал «Рио-де-Жанейро», 8 ноября, 14:00
Тезисы:
http://www.highload.ru/2017/abstracts/2913.html
Изначально будут раскрыты базовые причины, которые заставили появиться такой части механизма СУБД, как кэш результатов, и почему в ряде СУБД он есть или отсутствует.
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Apache Ignite Persistence: зачем Persistence для In-Memory, и как он работает...
HighLoad++ 2017
Зал «Рио-де-Жанейро», 8 ноября, 13:00
Тезисы:
http://www.highload.ru/2017/abstracts/2947.html
Apache Ignite — Open Source платформа для высокопроизводительной распределенной работы с большими данными с применением SQL или Java/.NET/C++ API. Ignite используют в самых разных отраслях. Сбербанк, ING, RingCentral, Microsoft, e-Therapeutics — все эти компании применяют решения на основе Ignite. Размеры кластеров разнятся от всего одного узла до нескольких сотен, узлы могут быть расположены в одном ЦОД-е или в нескольких геораспределенных.
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Механизмы мониторинга баз данных: взгляд изнутри / Дмитрий Еманов (Firebird P...
HighLoad++ 2017
Зал «Рио-де-Жанейро», 8 ноября, 12:00
Тезисы:
http://www.highload.ru/2017/abstracts/3005.html
Когда мы говорим о нагруженных системах и базах данных с большим числом параллельных коннектов, особый интерес представляет практика эксплуатации и сопровождения таких проектов. В том числе инструменты и механизмы СУБД, которые могут быть использованы DBA и DevOps-инженерами для решения задач мониторинга жизнедеятельности базы данных и ранней диагностики возможных проблем.
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