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Zookeeper presentation
1.
Координация в распределенных
системах с помощью Apache Zookeeper Маирбек Хадиков
2.
Координация В распределенных системах
не обойтись без координации
3.
Координация Система координации
должна быть отказоустойчивой
4.
Координация
Реализовать синхронизацию в распределенных системах сложно
5.
Zookeeper Распределенный Маштабируемый Fault Tolerant
Open Source
6.
Задачи Synchronization
Configuration Maintenance Groups Naming
7.
Структура
8.
ZNode
File Watches Directory Optimistic Atomic Locking Operations
9.
Флаги Sequential
Ephemeral
10.
Sequential some-znode-00000001 some-znode-00000002
some-znode-00000003 ...
11.
Ephemeral Время жизни ограниченно
временем сессии
12.
Гарантии
Sequential Consistency Single System Atomicity Image Timelines Reliability
13.
API create
get data delete get children set data sync
14.
Cluster mode
15.
Cluster mode Данные
сохраняются в памяти на всех серверах
16.
Cluster mode Лидер выбирается
при старте
17.
Cluster mode Клиенты подключенны
к follower'ам
18.
Cluster mode Все изменения
проходят через лидера
19.
Cluster mode Commit после
обновления данных на большинстве серверов
20.
Group Membership
21.
Group Membership Группе соответствует
определенный znode / ... group
22.
Group Membership Члены
группы создают ephemeral znode внутри группы / ... group member
23.
Group Membership
Если клиент недоступен znode автоматически удалится / ... group member
24.
Barier
25.
Barier Клиент вызывает exists+watcher
/ ... barier
26.
Barier Если znode отсутствует
барьер отпущен / ... barier
27.
Barier Если znode существует,
то ожидаем оповещение о его удалении / ... barier
28.
Leader Election
29.
Leader Election /
... election
30.
Leader Election
Каждый желающий создает ephemeral|sequential znode election node_00000001 node_00000002 node_00000003
31.
Leader Election Клиент у
которого znode с наименьшим номером -- leader election node_00000001 node_00000002 node_00000003
32.
Leader Election Остальные клиенты
ставят watch и следят за leader election node_00000001 node_00000002 node_00000003
33.
Leader Election Если
leader недоступен -- следующий доступный клиент избирается лидером election node_00000001 node_00000004 node_00000007
34.
Lock
35.
Lock Для общего ресурса
создается znode / ... resource
36.
Lock
Каждый процесс создает ephemeral|sequential znode resource lock_00000001 lock_00000002 lock_00000003
37.
Lock Процесс с наименьшим
znode удерживает lock resource lock_00000001 lock_00000002 lock_00000003
38.
Lock Остальные процессы ждут
удаления предыдущей znode resource lock_00000001 lock_00000002 lock_00000003
39.
Lock Для освобождения lock
процессом удаляется znode resource lock_00000001 lock_00000002 lock_00000003
40.
Спасибо
@mairbek mkhadikov@gmail.com github.com/mairbek
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