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Author SHA1 Message Date
192600064a add lab 7 2023-12-14 20:31:04 +03:00
d0d049afa1 update workers 3 lab 2023-12-14 20:23:42 +03:00
28 changed files with 998 additions and 6 deletions

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# Thumbnails
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@ -13,7 +13,7 @@ using System.Reflection;
[assembly: System.Reflection.AssemblyCompanyAttribute("worker-1")] [assembly: System.Reflection.AssemblyCompanyAttribute("worker-1")]
[assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")] [assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
[assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")] [assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+d64b702b1390dff3255929bb2b00605248500f1d")] [assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+6421a64f4e39630295913a16afaf3409740d23ce")]
[assembly: System.Reflection.AssemblyProductAttribute("worker-1")] [assembly: System.Reflection.AssemblyProductAttribute("worker-1")]
[assembly: System.Reflection.AssemblyTitleAttribute("worker-1")] [assembly: System.Reflection.AssemblyTitleAttribute("worker-1")]
[assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")] [assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]

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@ -1 +1 @@
b4384d6c7f5f0291b819e57beb7554a83883f51de1a9b79417abb0b571813599 9af98aeb69d81b14a8b8874a38b53eb1d16a1895591607774c73632f3c42f13e

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@ -0,0 +1,484 @@
## Ignore Visual Studio temporary files, build results, and
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##
## Visual studio for Mac
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*.usertasks
config.make
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*.swp

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@ -13,7 +13,7 @@ using System.Reflection;
[assembly: System.Reflection.AssemblyCompanyAttribute("worker-2")] [assembly: System.Reflection.AssemblyCompanyAttribute("worker-2")]
[assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")] [assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
[assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")] [assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+d64b702b1390dff3255929bb2b00605248500f1d")] [assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+6421a64f4e39630295913a16afaf3409740d23ce")]
[assembly: System.Reflection.AssemblyProductAttribute("worker-2")] [assembly: System.Reflection.AssemblyProductAttribute("worker-2")]
[assembly: System.Reflection.AssemblyTitleAttribute("worker-2")] [assembly: System.Reflection.AssemblyTitleAttribute("worker-2")]
[assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")] [assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]

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@ -1 +1 @@
4722328fc895d989f3d9529a0e32db57d2bf738a6e90864b9245732a0a8e723f f5286c69adb7a85d7604e4aa775a60561a8ce3fb6043c48838bcc0b51a15520a

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@ -0,0 +1,24 @@
# Отчет по лабораторной работе №7
Выполнил студент гр. ИСЭбд-41 Мытарин Е.С.
## Задачи
Написать небольшое эссе (буквально несколько абзацев) своими словами. А помогут Вам в этом вопросы из списка:
1. Какие алгоритмы и методы используются для балансировки нагрузки?
2. Какие открытые технологии существуют для балансировки нагрузки?
3. Как осуществляется балансировка нагрузки на базах данных?
4. Реверс-прокси как один из элементов балансировки нагрузки.
## Эссе
Балансировка нагрузки предназначена для равномерного распределения трафика и нагрузки между несколькими серверами или ресурсами. Она осуществляется с целью оптимизации производительности системы, улучшения доступности и минимизации риска перегрузки одного сервера. Классический пример - циклический перебор, когда балансировщик нагрузок отправляет по очереди запрос каждому серверу. Чем больше серверов тем меньше приходится нагрузки на каждого из них. Улучшенной версией является взвешенный циклический перебор, где каждому серверу назначаются веса мощности.
Среди открытых технологий для балансировки нагрузки можно выделить Nginx. Nginx очень популярен для распределения HTTP и HTTPS трафика с целью достижения равномерной загрузки между серверами. В качестве примеров еще можно выделить Apache HTTP Server и HAProxy.
В контексте баз данных можно выделить следующие подходы к реализации балансировки нагрузки:
1. Горизонтальное масштабирование шардирование, т.е. разбиение данные на несколько фрагментов, которые хранятся на отдельных серверах;
2. Вертикальное масштабирование на сервере увеличиваются производительность за счет добавления более мощного оборудования;
3. Репликация распределение нагрузок на чтение данных.
Обратный прокси это добавление прокси-сервера между клиентами и серверами базы данных. Прокси-сервер может распределить запросы от клиентов между несколькими серверами баз данных на основе различных алгоритмов балансировки нагрузки. Одним из таких алгоритмов является вышеупомянутая библиотека NGINX.