已經有一些嘗試去建立同時支援電路交換和分組交換的混合網路,比如ATM[^iii]。InfiniBand有一些相似之處【35】:它在鏈路層實現了端到端的流量控制,從而減少了在網路中排隊的需要,儘管它仍然可能因鏈路擁塞而受到延遲【36】。透過仔細使用**服務質量(quality of service,)**(QoS,資料包的優先順序和排程)和**准入控制(admission control)**(限速傳送器),可以在分組網路上類比電路交換,或提供統計上的**有限延遲**【25,32】。
一個有趣的例外是Spanner中的Google TrueTime API 【41】,它明確地報告了本地時鐘的置信區間。當你詢問當前時間時,你會得到兩個值:[最早,最晚],這是最早可能的時間戳和最晚可能的時間戳。在不確定性估計的基礎上,時鐘知道當前的實際時間落在該區間內。區間的寬度取決於自從本地石英鐘最後與更精確的時鐘源同步以來已經過了多長時間。
演算法的理論描述可以簡單宣稱一些事是不會發生的——在非拜占庭式系統中,我們確實需要對可能發生和不可能發生的故障做出假設。然而,真實世界的實現,仍然會包括處理“假設上不可能”情況的程式碼,即使程式碼可能就是`printf("Sucks to be you")`和`exit(666)`,實際上也就是留給運維來擦屁股【93】。(這可以說是電腦科學和軟體工程間的一個差異)。
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[^譯著1]: 原詩為:Hey I just met you. The network’s laggy. But here’s my data. So store it maybe.Hey, 應改編自《Call Me Maybe》歌詞:I just met you, And this is crazy, But here's my number, So call me, maybe?