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A study on dynamic adaptation of distributed systems using immune mechanism

利用免疫机制的分布式系统动态自适应研究

基本信息

批准号：
12680359
负责人：
YAMAMOTO Yoshikazu
金额：
$ 2.05万
依托单位：
Keio University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12680359/
关键词：
dynamic adaptation artificial immune network meta-level architecture Web server network server fine grained object self-organized system design pattern Webサーバネットワークサーバ自己反映計算

项目摘要

It is very interesting problem that how to make a software used in dynamically changing environment or usage patterns, such as a server that is used by public or unspecified systems. If the dynamic environmental change is predictable, it can be achieved by incorporating these conditions and actions as production rules into the software. On the other hand, for the software such as Web servers where access patterns are completely unpredictable, it is highly appreciate for system developers if the system has an ability to adapt autonomously to dynamic environmental change.The purpose of this research was to implement a mechanism that is necessary for dynamic adaptation of systems. We utilize fine grained objects, reflection and meta-level architecture as base technologies. In the first year, we developed a policy coordination engine named iNexus that utilized an artificial immune network as a tool for autonomous and dynamic adaptation to the environment. And then we implemented OpenWebServer that utilized the iNexus, and verified that the OpenWebServer could change processing policies depending on dynamically changing access patterns. In the second year, we noticed high adaptability to environmental change of an artificial immune networks and developed a communication management system that used an artificial immune network as a tool for decision making of control policy. The system also showed high applicability of the artificial immune network even to the real application.In case of a distributed system as a whole dynamically adopts to its environment, we realize a mechanism that makes copy of contents of a server which has over concentrated access. This mechanism can be used for a aid of congestion avoidance tool of Web access in the Internet. We also study the cost of copy and communication load in various environments and verify its usefulness in practical application to Web servers.

如何使软件能够用于动态变化的环境或使用模式，例如公共或非特定系统使用的服务器，是一个非常有趣的问题。如果动态环境变化是可预测的，则可以通过将这些条件和动作作为生产规则合并到软件中来实现。另一方面，对于诸如Web服务器之类的访问模式完全不可预测的软件，如果系统具有自主适应动态环境变化的能力，那么系统开发人员就会非常感激。本研究的目的是实现一种系统动态适应所必需的机制。我们利用细粒度对象、反射和元级架构作为基础技术。第一年，我们开发了一个名为 iNexus 的政策协调引擎，它利用人工免疫网络作为自主、动态适应环境的工具。然后我们实现了利用 iNexus 的 OpenWebServer，并验证了 OpenWebServer 可以根据动态变化的访问模式来改变处理策略。第二年，我们注意到人工免疫网络对环境变化的高度适应性，并开发了一种使用人工免疫网络作为控制政策决策工具的通信管理系统。该系统还显示了人工免疫网络对实际应用的高度适用性。在分布式系统作为一个整体动态适应其环境的情况下，我们实现了一种复制具有过度集中访问的服务器内容的机制。该机制可以作为Internet中Web访问拥塞避免的辅助工具。我们还研究了各种环境中的复制成本和通信负载，并验证了其在 Web 服务器实际应用中的有用性。