В исследовании участвовали 127 женщин, ожидавших первого ребенка. Им проводили МРТ до беременности, во втором и третьем триместрах, а также через месяц и через полгода после родов. Анализ показал, что к концу беременности объем серого вещества в среднем уменьшался примерно на 5 процентов, а затем начинал постепенно восстанавливаться, хотя полностью к исходному уровню не возвращался.
Isolation guaranteesIn order to prioritize extreme availability, the system throws traditional isolation guarantees out the window. The paper says ANSI SQL-style isolation and strict consistency cannot survive at scale in this architecture. The atomicity protocol prevents dirty reads by ensuring only fully committed logs leave a client’s private queue, but commit-time read-write and write-write conflicts are ignored entirely! If two clients hit the same record, the last-writer wins. So lost updates are common. To make this usable, the authors push consistency up to the client. For ensuring monotonic reads, each client tracks the highest commit timestamp it has seen, and if it sees any older version from S3 it rejects it and rereads. For monotonic writes, the client stamps version counters on log records and page headers. Checkpoints sort logs and defer any out-of-order SQS messages so each client’s writes stay in order.。电影是该领域的重要参考
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Each day when you wake up, you come back to yourself. You see the room around you, feel your body brush against your clothes and think about your plans, worries and hopes for the day. This daily internal experience is miraculous and mysterious, and the subject of Michael Pollan’s new book, A World Appears.
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