多点分布式通信与控制技术研究

发布时间：2018-12-29 10:44

【摘要】：随着网络通信技术不断发展,即时通信逐渐成为企业互联网网络通信活动中的重要业务,特别是企业内部日常通信和业务交流,开始往实时化,网络化,开放化发展,随之而来对即时通信的功能需求也与日俱增。目前,市场上基于Linux平台的企业级即时通信类软件较少,而且面临标准不一,使用体验较差,不易扩展等问题,因此如何设计并搭建一个基于Linux平台并且应用于企业的高可用和高可扩展的即时通信系统成为一个重要课题。课题在对即时通信系统所涉及到的原理和技术进行了详细的分析和研究的基础上,开发了一套完整的分布式即时通信系统。本文将详述系统的整体架构和设计方案,各个模块的详细设计及具体功能的实现方法,特别是如何利用ACE(Adaptive Communication Environment,自适应通信环境)提供的组件,实现多点通信,有效提高代码的可移植性和系统的稳定性。另外,对应用于Memcached的一致性hash算法进行了改进。最后分别对改进后的一致性hash算法进行均匀分布和节点增删测试,以及系统的功能和性能测试,并且分析总结测试结果。经测试,改进后的一致性hash算法可以有效缓解Memcached的负载压力,并在一定程度上解决了增减Memcached时导致的缓存失效问题;系统实现了点对点、多点聊天、群组等功能;在系统平均响应时间为200ms、集群机器数为5的前提下,系统能承受至少10万人同时在线的压力。另外,系统的服务端模块化设计方法,对企业自主开发内部的即时通信系统具有一定的参考价值和指导意义。
[Abstract]:With the continuous development of network communication technology, instant messaging has gradually become an important business in the Internet communication activities of enterprises, especially in the daily communication and business exchanges within enterprises. It has begun to develop into real-time, networked and open. Subsequently, the demand for instant messaging functions is also increasing. At present, there are few enterprise-class instant messaging software on the market based on Linux platform, and they are faced with many problems, such as different standards, poor use experience and difficult to expand, etc. Therefore, how to design and build a high availability and extensible instant messaging system based on Linux platform has become an important issue. Based on the detailed analysis and research of the principles and technologies involved in the instant messaging system, a complete distributed instant messaging system is developed. This paper will describe the overall architecture and design scheme of the system, the detailed design of each module and the implementation of specific functions, especially how to use the components provided by the ACE (Adaptive Communication Environment, adaptive communication environment to achieve multi-point communication. Effectively improve code portability and system stability. In addition, the consistent hash algorithm applied to Memcached is improved. Finally, the improved uniform hash algorithm is tested by uniform distribution, node addition and deletion, as well as the function and performance of the system, and the test results are analyzed and summarized. After testing, the improved consistent hash algorithm can effectively alleviate the load pressure of Memcached, and solve the cache failure problem caused by increasing and decreasing Memcached to a certain extent, the system realizes the functions of point-to-point, multi-point chat, group, etc. Under the condition that the average response time is 200ms and the number of cluster machines is 5, the system can withstand the pressure of at least 100000 people online at the same time. In addition, the modularization design method of the service side of the system has certain reference value and guiding significance for the enterprise to develop the internal instant communication system independently.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TP311.52;TP316.81

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