Oreizy et al, 1999 selfadaptive software evaluates its own behavior and changes behavior when the evaluation indicates that it is not accomplishing what the software is intended to do, or when better functionality or performance is possible. Towards a selfadaptive middleware for building reliable pubsub systems 3 of using existing faulttolerant libraries in pubsub systems. Finally, we extend the notion of selfadaptation to distributed systems as an evolution of. Uncertainty in the nature of the operating environment may cause the behaviour of selfadaptive systems to be emergent. Modern software systems are expected to operate under uncertain conditions, without interruption. Our software adaptation approach should be independent of applications. A software application are usually openloop systems, in selfadaptive they would be converted to a closedloop system using feedback feedback loop takes into account a more holistic view of what happens inside the application and its environment selfadaptive systems aim to adjust various artifacts and attributes in response to. Distributed approaches for selfadaptive embedded systems ersa12 academic invited paper pascal benoit lirmm, umr 5506, cnrs university of montpellier, 161 rue ada, 34095 montpellier cedex 5, france abstractin the recent years, there has been a growing interest in selfadaptive embedded systems. The large scale distributed systems for example, cluster, grid and cloud computing systems are difficult to manage and control through continuous monitoring and intervention. Monitor, analyze, plan, and execute, together forming a mape loop. The notion of secure perimeter given by border firewalls ignores the possibility of attacks originating from inside the network.
Such selfadaptive embedded systems pose great advantages in terms of flexibility, resource utilization, energy efficiency and. Managing such systems with human operators prove difficult especially as the size of the systems continue to grow. A scalable architecture for adaptive and distributed. Self adaptation is typically realized using a control loop. As mentioned earlier, many future driver assistance systems like the ones basing on cartox communication set up the requirement to allow changes of the software and system architecture at runtime. The evaluation approaches for selfadaptive systems proposed so far in the scientific literature may be analyzed from various points of view. Componentbased selfadaptive middleware architecture for networked embedded systems dr. Software engineering of selfadaptive systems springerlink. However, due to the extreme complexity and dynamism of the depicted software system, manual adaptation by an operator would be nearly impossible. A selfadaptive deployment framework for serviceoriented systems. Towards fully decentralized selfadaptive reactive systems mauro caporuscio linnaeus university vaxjo, sweden mauro. A survey on engineering approaches for selfadaptive systems. Dynamic self adaptation in distributed systems springerlink.
Formal design and verification of selfadaptive systems. This distributed architecture allows systems to be created with the. An architecture for selfadaptive distributed firewall. A framework for selfadaptive, high performance parallel programming in distributed systems by tai the nguyen a thesis submitted in partial ful llment of the requirements for the degree of master of science in computer science washington state university school of engineering and computer science, vancouver may 2016.
A general selfadaptive task scheduling system for non. The selfadaptive behavior in this application ensures that the system itself resolves failures of the control software of the robots. Todays distributed embedded systems comprise various fields of application. Distributed firewall systems emerged with the proposal of protecting individual hosts against attacks originating from inside the network. Work at the santa fe institute is usually presented as the study of complex adaptive systems cas. Introduction this paper is an extension of the workinprogress presented in 1, where we introduced a vision showing the tendency of moving towards various networks of context. Hence there is a need for these systems to be selfadaptive and manage themselves at runtime. A framework for selfadaptive, high performance parallel programming in distributed systems by tai the nguyen a thesis submitted in partial ful llment of the requirements for the degree of master of science in computer science washington state university school of engineering and computer science, vancouver. Componentbased selfadaptive middleware architecture for. The paper is partitioned into four parts, one for each of the identified essential views of self adaptation.
In particular, formal methods for designing and assuring the functional correctness of the decentralized adaptation logic are highly demanded. Coordinated actors for reliable selfadaptive systems. Index termssoftware design, complex systems, distributed systems, feedback loops, self management, transactions. Moving towards distributed networks of proactive, self. Pdf this paper proposes a novel approach to adapting applications, which are. Formalizing distributed selfadaptive systems using high.
An adaptive system is a set of interacting or interdependent entities, real or abstract, forming an integrated whole that together are able to respond to environmental changes or changes in the interacting parts, in a way analogous to either continuous physiological homeostasis or evolutionary adaptation in biology. However, the current framework employs a centralized set of replicated brokers and must. Self adaptive application level fault tolerance for parallel. Towards fully decentralized selfadaptive reactive systems. If the application is a longrunning job days or weeks, the a general selfadaptive task scheduling system for nondedicated heterogeneous computing ming wu, student member, ieee, xianhe sun, senior member, ieee. Feedback loops represent a key feature of adaptive. Pdf bioinspired selfadaptive agents in distributed systems. Thus, distributed selfadaptive systems are an actual need and require to be studied in order to understand the most effective way to design and manage them. This is a representative example for a smallscale, distributed, self adaptive system, that is, it will change its structure. A mobile agent middleware for selfadaptive wireless. We call these highly distributed, dynamically changing systems distributed driver assistance systems ddas. The improvement is exemplified in using an adaptive proportional. The goal of this roadmap paper is to summarize the stateoftheart and to identify critical challenges for the systematic software engineering of self adaptive systems.
On patterns for decentralized control in selfadaptive systems. The literature provides different approaches to deal with such systems. A scalable architecture for adaptive and distributed monitoring. Developing selfadaptive automotive systems springerlink. Consequently, in this paper we proposed an approach for a self adaptive distributed decision support model to provide more intelligent support for iot applications. A systematic survey on the design of selfadaptive software systems using control engineering approaches. Formal design and verification of selfadaptive systems with. Increasingly they are deployed in complex scenarios and must be able to adapt to changing environments and internal system changes. Designing robust and adaptive distributed systems with weakly. A middlewarelevel approach to adaptive distributed systems. Distributed systems essentially lack no global view due to.
Abstract the challenges of pervasive and mobile computing environments, which are highly dynamic and unpredictable, have motivated the development of self adaptive software systems. Featuremodelguided online learning for selfadaptive systems andreas metzger, clement quinton, zolt. The design of complex distributed selfadaptive systems having decentralized adaptation control by multiple interacting mape components is among the major challenges. However, several challenges remain, including decentralized coordination of selfadaptation in a distributed setting. Unfortunately, the latter types of control loops are far more common. Modeldriven development of selfdescribing components for. Today systems are often large, complexed and highly distributed. We are developing selfadaptive middleware for distributed stream management that aims to.
Loosely coupled actors as the units of concurrency, with asynchronous message passing, and eventdriven computation, are natural candidates for modeling highly dynamic distributed systems. A selfadaptive deployment framework for serviceoriented. Sven tomforde university of passau abstractwith the intensi. Systems are highly distributed and must integrate all available, highly. The dynamic behavior of a large scale distributed system is nearly impossible to monitor in details while maintaining continuous operability offering service delivery. Although noteworthy successes have been achieved on many fronts, the.
Distributed stream management using utilitydriven self. Such systems have a growing complexity due to advanced features, such as adaptive mechanisms, they are equipped with to deal with the dynamical environments in which they operate. Towards a selfadaptive middleware for building reliable. Abstract the challenges of pervasive and mobile computing environments, which are highly dynamic and unpredictable, have motivated the development of selfadaptive software systems. Agilla provides support for both local and remote tuple space operations. Mobile agent interactions are facilitated by two basic data abstractions on each node. A new approach to deploy a selfadaptive distributed firewall. Different concepts of selfimprovement andreas niederquell seminar intelligent systems prof. Self adaptive application level fault tolerance for. However, while several algorithms for selfadaptation have been proposed, stable platforms and comprehensive. Keywordssmart applications, selfadaptive systems, contextaware systems, proactive computing, distributed networks. Selfadaptive systems 11 adapt themselves to changing requirements and environments, providing dependability, robustness and availability with minimal human interaction. This framework dynamically discovers machines in the network and generates a mapping of components to machines based on nonfunctional properties.
The distributed systems pdf notes distributed systems lecture notes starts with the topics covering the different forms of computing, distributed computing paradigms paradigms and abstraction, the socket apithe datagram socket api, message passing versus distributed objects, distributed objects paradigm rmi, grid computing introduction. For example, in the rainbow framework 17, the managedsubsystemmaps to the systemlayerand the managingsubsystem to the architecture layer. The emergence of global network connectivity has motivated the investigation of models and techniques for dynamic self adaptive distributed software for two reasons. Scalable selfadaptive synchronous triggering system in superconducting quantum computing lihua sun, futian liang, jin lin, cheng guo, yu xu, shengkai liao and chengzhi peng hefei national laboratory for physical sciences at the microscale and department of modern physics, university of science and technology of china, hefei 230026, china. The design of complex distributed self adaptive systems having decentralized adaptation control by multiple interacting mape components is among the major challenges. Index termsselfexplanation, selfadaptive, goals, claims i. As even selfadaptive systems still require manual maintenance. The goal of this roadmap paper is to summarize the stateoftheart and to identify critical challenges for the systematic software engineering of selfadaptive systems. Section 6 concludes the paper and discusses future work. Design and management of distributed selfadaptive systems.
One prominent approach for organizing a control loop in self adaptive systems is by means of four components that are responsible for the primary functions of self adaptation. Sep 02, 2011 modeldriven development of self describing components for self adaptive distributed embedded systems abstract. It directly adapts paxos 14, a classic crashtolerant replicated state machine approach. For example, the feedback loops at every stage in royces waterfall model 18 or the risk feedback loop in boehms spiral model 19 are well known. Selfadaptive software is a response to these demands. However, this approach lacks protection against software vulnerabilities that can. Because its behaviour is emergent, a selfadaptive system needs to garner con. This paper proposes a novel approach to adapting applications, which are running on one or more computers. The self adaptive behavior in this application ensures that the system itself resolves failures of the control software of the robots. In this paper, we introduce a twolayer formal model for selfadaptive distributed discreteevent systems, based on standard low and highlevel petri nets. Dynamic deployment of software components for self.
A research roadmap 15 control engineering has determined that systems with a single control loop are easier to reason about than systems with multiple loops. Dynamic deployment of software components for selfadaptive. Scalable selfadaptive synchronous triggering system in. Keywordssmart applications, self adaptive systems, contextaware systems, proactive computing, distributed networks. Distributed approaches for selfadaptive embedded systems. This is a representative example for a smallscale, distributed, selfadaptive system, that is, it will change its structure. In this paper, we introduce a twolayer formal model for self adaptive distributed discreteevent systems, based on standard low and highlevel petri nets. We argue that a selfadaptive systems behaviour is best. These changes may stem from the software systems self internal causes, e. Towards a self adaptive middleware for building reliable pubsub systems 3 of using existing faulttolerant libraries in pubsub systems.
Disnix is then invoked to automatically, reliably and. In this paper, we only consider resources are overloaded when we mention resource abnormality. Managing uncertainty in selfadaptive systems with plan. His current research focuses primarily on computer security, especially in operating systems, networks, and large widearea distributed systems.
Abstracta selfadaptive system can modify its own structure and behavior at runtime based on its perception of the environment, of itself and of its requirements. Engineering selfadaptive systems through feedback loops 51 feedback loops have been recognized as important factors in software process management and improvement or software evolution. A mobile agent middleware for selfadaptive wireless sensor networks 16. Other research communities that have also investigated this topic from their own perspective are even more diverse. The authors in 43 use core function to refer to the man. To facilitate the design of largescale, selfadaptive systems, we have developed the portbased adaptable agent architecture. The paper is partitioned into four parts, one for each of the identified essential views of selfadaptation. Possible causes of uncertainties include changes in the operational environment, dynamics in the availability of resources, and variations of user goals. Selfadaptive and reconfigurable distributed computing systems. The self adaptive distributed stream management middleware we have implemented is aligned with topics of interest to the autonomic community, to overlay management, and to those interested in middleware for largescale distributed data management. We believe that these two functions can only be achieved if a selfadaptive system is also capable of selfexplanation.
Introduction cyberphysical systems cps are a class of distributed. Although distributed firewalls allow the protection of individual hosts, the provided services might still be susceptible. Scalable self adaptive synchronous triggering system in superconducting quantum computing lihua sun, futian liang, jin lin, cheng guo, yu xu, shengkai liao and chengzhi peng hefei national laboratory for physical sciences at the microscale and department of modern physics, university of science and technology of china, hefei 230026, china. Assuming any selfadaptive system is composed of a managed system which implements the system s functionality and a managing system the controller, which implements the selfadaptive functionality, such as fig. A selfadaptive distributed decision support model for. The key idea behind the proposed approach is to introduce the policybased relocation of components to define functions between computers as a basic mechanism for adaptation on distributed systems. Pdf an architecture for selfadaptive distributed firewall. Engineering selfadaptive systems through feedback loops. In these systems, firewall rules are centrally created, then distributed and enforced on all servers that compose the firewall, restricting which services will be available. If the application is a longrunning job days or weeks, the a general self adaptive task scheduling system for nondedicated heterogeneous computing ming wu, student member, ieee, xianhe sun, senior member, ieee.
The selfadaptive distributed stream management middleware we have implemented is aligned with topics of interest to the autonomic community, to overlay management, and to those interested in middleware for largescale distributed data management. Selfadaptive system an overview sciencedirect topics. These changes may stem from the software system s self internal causes, e. Mohana roopa2 1 departement of electronics and communication engineering, institute of aeronautical engineering, hyderabad, india. Selfadaptation is typically realized using a control loop. Introduction selfadaptive systems posess an ability to adjust their behaviour in response to changes in their operating environment. In section 5, some initial experimental results are presented. A selfadaptive system must support both the consistent evo.