强一致  最终一致 Frequently Asked Questions - Consul by HashiCorp https://www.consul.io/docs/faq.html Q: Is Consul eventually or strongly consistent? Consul has two important subsystems, the service catalog and the gossip protocol. The service catalog store…

小结 1.Consul 功能更丰富: 2. 暴露http接口避免暴露系统复杂性 The Consul clients expose a simple HTTP interface and avoid exposing the complexity of the system to clients in the same way as ZooKeeper. 3.健康检查health checking的不同实现: Consul vs. Other Software - Consul by Hashi…

原文地址-石匠的Blog: http://www.bugclosed.com/post/5 在分布式架构中,服务治理是一个重要的问题.在没有服务治理的分布式集群中,各个服务之间通过手工或者配置的方式进行服务关系管理,遇到服务关系变化或者增加服务的时候,人肉配置极其麻烦且容易出错. 之前在一个C/C++项目中,采用ZooKeeper进行服务治理,可以很好的维护服务之间的关系,但是使用起来较为麻烦.现在越来越多新的项目采用consul进行服务治理,各方面的评价都优于ZooKeeper,经过几天的研究…

This article is from blog of Amazon CTO Werner Vogels. -------------------- Today is a very exciting day as we release Amazon DynamoDB, a fast, highly reliable and cost-effective NoSQL database service designed for internet scale applications. Dynamo…

Service discovery is a key component of most distributed systems and service oriented architectures. The problem seems simple at first: How do clients determine the IP and port for a service that exist on multiple hosts? Usually, you start off with s…

Consul vs. Eureka Eureka is a service discovery tool. The architecture is primarily client/server, with a set of Eureka servers per datacenter, usually one per availability zone. Typically clients of Eureka use an embedded SDK to register and discove…

Hbase是一个强一致性数据库,不是“最终一致性”数据库,官网给出的介绍: “Strongly consistent reads/writes: HBase is not an "eventually consistent" DataStore. This makes it very suitable for tasks such as high-speed counter aggregation.” 这里要先提一下分布式系统的CAP原理:Consistency(一致性), 数据一致更…

http://nosql-database.org Core NoSQL Systems: [Mostly originated out of a Web 2.0 need] Wide Column Store / Column Families Hadoop / HBase API: Java / any writer, Protocol: any write call, Query Method: MapReduce Java / any exec, Replication: HDFS Re…

3. Time and order What is order and why is it important? What do you mean "what is order"? I mean, why are we so obsessed(着迷的) with order in the first place? Why do we care whether A happened before B? Why don't we care about some other property…

/* Domain 1 Design Resilient Architectures 1. Which of the following statements regarding S3 storage classes is true? A. The availability of S3 and S3-IA is the same. B. The durability of S3 and S3-IA is the same. C. The latency of S3 and Glacier is…