概述

Paxos算法是Lamport创造的基于消息的共识算法， 包括Google的Chubby 在内的很多系统都在应用Paxos算法， Google Chubby 有下面的描述

all working protocols for any asynchronous consensus we hava so far encountered hava Paxos at their core.

I’ve seen a number of distributed databases recently describe themselves as being “CA” –that is, providing both consistency and availability while not providing partition-tolerance. To me, this indicates that the developers of these systems do not understand the CAP theorem and its implications.

I’ve been thinking about the lessons distributed systems engineers learn on the job. A great deal of our instruction is through scars made by mistakes made in production traffic. These scars are useful reminders, sure, but it’d be better to have more engineers with the full count of their fingers.

CLOSE_WAIT出现的原因: 就是某一方在网络连接断开后，对等方没有检测到这个错误（对方断开）而没有调用 closesocket，导致了这个状态的出现;

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