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缓存一致性,先更新数据库在更新缓存 #1

@q996676479

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@q996676479

A线程更新完数据库,然后时间片给线程B了,这时B线程刚开始请求(拿到的是最新的版本号),更新完数据库和缓存,这时A再去更新缓存。这时不会发生不一致吗。

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