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ailearning icon ailearning

AiLearning: 机器学习 - MachineLearning - ML、深度学习 - DeepLearning - DL、自然语言处理 NLP

alibaba-mom icon alibaba-mom

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

architecture.of.internet-product icon architecture.of.internet-product

互联网公司技术架构,微信/淘宝/微博/腾讯/阿里/美团点评/百度/Google/Facebook/Amazon/eBay的架构,欢迎PR补充

awesome-blockchain icon awesome-blockchain

⚡️Curated list of resources for the development and applications of block chain.

awesome-python icon awesome-python

A curated list of awesome Python frameworks, libraries, software and resources

bee-apm icon bee-apm

BeeAPM is a distributed tracing system and APM ( Application Performance Monitoring )

deeplearning-500-questions icon deeplearning-500-questions

深度学习500问,以问答形式对常用的概率知识、线性代数、机器学习、深度学习、计算机视觉等热点问题进行阐述,以帮助自己及有需要的读者。 全书分为18个章节,近30万字。由于水平有限,书中不妥之处恳请广大读者批评指正。 未完待续............ 如有意合作,联系[email protected] 版权所有,违权必究 Tan 2018.06

deta_cache icon deta_cache

《VPCS架构》德塔公司开源缓存服务器 纯map对象 存储上亿级量子碎片,2分法字符串索引,高并发安全,超时验证。作者 罗瑶光

dynomite icon dynomite

A generic dynamo implementation for different k-v storage engines

easytransaction icon easytransaction

A distribute transaction solution(分布式事务) unified the usage of TCC , SAGA ,FMT (seata/fescar AutoCompensation), reliable message, compensate and so on;

eureka icon eureka

AWS Service registry for resilient mid-tier load balancing and failover.

evt icon evt

Boost Engine for Token Economy

hotfixdemo icon hotfixdemo

该项目是一个Gradle插件,实现android的热修复

incubator-dubbo icon incubator-dubbo

Apache Dubbo (incubating) is a high-performance, java based, open source RPC framework.

jaydio icon jaydio

A Java library to perform direct I/O in Linux, bypassing file page cache.

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