Looking back, we find this claim outdated. Global counters aren’t a bottleneck for Snapshot Isolation: Amazon Aurora stamps transactions with a Global Log Sequence Number (GLSN) via a primary writer, but still scales (vertically) cleanly without slowing disaggregated storage. More importantly, modern distributed database systems implement snapshot isolation, using loosely synchronized physical clocks (and hybrid logical clocks) to give global ordering with no centralized counter at all. Thank God for synchronized clocks!
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客人点菜的时候,后厨经理(线程池)就分配一个厨师去做这道菜。厨师拿到菜单,开始备菜、切菜,然后发现需要炖汤,要等20分钟(IO等待)。这时候厨师就傻站在灶台前盯着砂锅,啥也不干,就干等。等汤炖好了,继续炒菜,最后出菜。