xlnjulp Stay Hungry, Stay Foolish

January 29, 2010Vector clocks are confusing the first time you’re introduced to them. It’s not clear what their benefits are, nor how it is you derive said benefits. Indeed, each Riak developer has

April 5, 2010A couple of months ago, Bryan wrote about vector clocks on this blog. The title of the post was “Why Vector Clocks are Easy”; anyone who read the post would realize that he meant that

Synchronization in a Distributed SystemRylan Dirksen 04 Oct 2013 ToolsMost of us use distributed systems on a daily basis, and for good reason; the stability, fault tolerance and scalabi

在集群中事件的先后顺序可以通过时间戳来进行定义。在自然状态下，大家都会想到使用物理时钟来表示时间戳，然而当系统对事件的时间有严格的要求的时候（比如状态的同步），物理时钟存在如下问题：由于服务器之间存在的结构差异，导致服务器运行一段时间后产生不同的时间飘移，这样不同的服务器的物理时钟存在一定的差异。直接导致了，事件A发生的顺序可能晚于事件B，但是发送过来的时间戳确小于B，如果涉及到状态的同步B的

和之前Cristian’s算法不同，这里的同步shiyou

/** * Copyright (C) 2009-2014 Typesafe Inc. */package akka.clusterimport akka.AkkaExceptionimport System.{ currentTimeMillis ⇒ newTimestamp }import java.security.MessageDigestimport java.ut