技术笔记本

作者：Leslie Lamport （非常厉害的老头了）在使用消息进行通信的分布式系统中，使用物理时钟对不同process进行时间同步与事件排序是非常困难的。一是因为不同process的时钟有差异，另外也是因为在计算中时间表示的精度也是有限的，两个时间标签相同的时间便无法区分前后了。Lamport提出逻辑时钟的概念。在同一process中，事件发生的顺序很容易定义与区分,不同process

1) 启动副本集三个shard，每个shard三个副本，三台机器（170/171/172），每台机器分别对应三个shard中的一个副本#170mongod --shardsvr --replSet shard-a --dbpath /mongo-data/rs-170-a --port 30000 --logpath /mongo-data/rs-170-a.log --fork --no

数据可视化https://github.com/showcases/data-visualization

Understanding the Internal Message Buffers of StormJun 21st, 2013 Table of ContentsInternal messaging within Storm worker processesIllustrationDetailed descriptionWorker processesExecutors

LinkedIn贡献的分布式消息系统 - 请参考这里kafka集群：producer写入消息，consumer读取消息消息分为不同主题，每个主题可以分为多个partition（并行），每个partition可以多个副本，每个partition内保证消息顺序，consumer读取消息时也可以保证顺序（一个partition的消息只发送给一个consumer），如果要保持同一主题所

原文：http://stackoverflow.com/questions/8200015/what-is-the-difference-between-serializability-and-linearizabilityIt was hard to find information about this subject. However, At some point I found a

关于分布式系统CAP理论的说明，值得看看，原文连接A plain english introduction to CAP TheoremYou’ll often hear about the CAP theorem which specifies some kind of an upper limit when designing distributed systems. As w

Consistent HashingPosted by tomwhite on November 27, 2007 at 9:56 AM PSTI've bumped into consistent hashing a couple of times lately. The paper that introduced the idea (Consistent Has

Disaster Recovery, High Availability, and Continuous Availability - What's the Difference?Posted by david t on September 7, 2010 at 12:30amView BlogLast month I posted a video that gave a brie

by Henry Robinson, April 26, 2010The ‘CAP’ theorem is a hot topic in the design of distributed data storage systems. However, it’s often widely misused. In this post I hope to highlight why the co

从开发，测试，运营角度分享MSN，Windows Live的经验。设计开发团队可多多参考。以测试，运营的角度理解软件，有大型系统经验的工程师应有共鸣。On Designing and Deploying Internet-Scale Services

As part of the research for my book, I came across an algorithm called Redlock on the Redis website. The algorithm claims to implement fault-tolerant distributed locks (or rather, leases [1]) on top o...