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За счёт чего достигается синхронизация в ConcurrentHashMap?

Ответ: В ConcurrentHashMap, начиная с Java 8, синхронизация достигается за счёт сочетания атомарных операций и локальной синхронизации на уровне отдельных ячеек (bin) таблицы.

Когда происходит вставка, карта сначала пытается разместить элемент в нужной ячейке массива table с помощью атомарной операции CAS (Compare-And-Swap). Это безблокирующий способ записи: если ячейка пуста, значение вставляется безопасно без захвата монитора.

Если в ячейке уже есть другие элементы и простая вставка невозможна, используется synchronized, но только на уровне конкретного узла (Node). Это означает, что блокировка применяется локально, не затрагивая всю карту, и другие потоки могут параллельно работать с другими ячейками.

tags: #собеседование

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Java Developer
❔ Вопрос с собеседования

За счёт чего достигается синхронизация в ConcurrentHashMap?

Ответ: В ConcurrentHashMap, начиная с Java 8, синхронизация достигается за счёт сочетания атомарных операций и локальной синхронизации на уровне отдельных ячеек (bin) таблицы.

Когда происходит вставка, карта сначала пытается разместить элемент в нужной ячейке массива table с помощью атомарной операции CAS (Compare-And-Swap). Это безблокирующий способ записи: если ячейка пуста, значение вставляется безопасно без захвата монитора.

Если в ячейке уже есть другие элементы и простая вставка невозможна, используется synchronized, но только на уровне конкретного узла (Node). Это означает, что блокировка применяется локально, не затрагивая всю карту, и другие потоки могут параллельно работать с другими ячейками.

tags: #собеседование

📱 Java Developer | Чат
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