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Name: fitz
Type: User
Name: fitz
Type: User
2015 ali中间件比赛项目,1. 通信模块: 涉及到了消息架构设计,每一个主题分配1-2个队列,这个是可以横向增加,考虑到了一个主题有多个消费者订阅,而且还有过滤条件,为了负载均衡,对应的队列投递消息是根据随机数对队列数取膜完成的。以上是内存队列。 2. 持久化系统:因为考虑到机器坏掉,broker不可用等等原因导致的消息丢失,就需要每次收到的消息必须及时落盘,这个就是比赛优化的重中之重。为此设计了一个小型的文件系统,借鉴阿里的rocketmq. 用一个大的日志文件,一般1G大小每个,和内存队列的结构映射到实体队列。整个日志文件是顺序文件,每条消息固定大小,里面有对应的队列号,消息号,还有长度等等。这个方便恢复消息到实体队列用的。 同步刷盘,异步刷盘,持久化必须可靠,所以一般是同步刷盘到日志文件,日志文件定时异步刷盘到实体队列,实体队列里面是索引,消息的本体在日志文件里面。为了加快大面积的写入速度,用了内存映射:内存映射文件首先将外存上的文件映射到内存中的一块连续区域,被当成一个字节数组进行处理,读写操作直接对内存进行操作,而后再将内存区域重新映射到外存文件,这就节省了中间频繁的对外存进行读写的时间,大大降低了读写时间
Free and Open, Distributed, RESTful Search Engine
AWS Service registry for resilient mid-tier load balancing and failover.
模拟登录一些知名的网站,为了方便爬取需要登录的网站
Various information query via command line.
Mirror of Apache Kafka
BAT程序员自己的简历模板分享出来了 。技术简历追求简单明了,避免没有必要的花哨修饰,大家可以fork到自己仓库中,基于这个模板进行修改。
原生小程序云开发,别人领外卖券,你拿佣金,轻松赚个零花钱
简单的短信网关服务,提供客户端 SDK ,支持阿里云,腾讯云,亿美短信发送,适用于中小型公司。您的 ⭐️ ⭐️⭐️Star⭐️⭐️ ⭐️,是我的动力!如果您觉得还不错,请点上一颗小星星。
Mirror of Apache RocketMQ
Spring Boot
spingboot-cloud
A Gateway built on Spring Framework and Spring Boot providing routing and more.
A lightweight distributed task scheduling framework.(分布式任务调度平台XXL-JOB)
Apache ZooKeeper
A declarative, efficient, and flexible JavaScript library for building user interfaces.
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
An Open Source Machine Learning Framework for Everyone
The Web framework for perfectionists with deadlines.
A PHP framework for web artisans
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
Some thing interesting about web. New door for the world.
A server is a program made to process requests and deliver data to clients.
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
Some thing interesting about visualization, use data art
Some thing interesting about game, make everyone happy.
We are working to build community through open source technology. NB: members must have two-factor auth.
Open source projects and samples from Microsoft.
Google ❤️ Open Source for everyone.
Alibaba Open Source for everyone
Data-Driven Documents codes.
China tencent open source team.