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Preventing deadlocks and starvation in distributed object oriented systems

COMPUTERS & ELECTRICAL ENGINEERING 2013年第2期39卷 582-595页

作者： Geetha, V. Sreenath, N. Pondicherry Engn Coll Dept Informat Technol Pillaichavady 605014 Puducherry India Pondicherry Engn Coll Dept Comp Sci & Engn Pillaichavady 605014 Puducherry India

This paper proposes a deadlock prevention algorithm for distributed object oriented systems based on the popular resource ordering technique. In distributed object oriented system, objects are the resources requested by the transactions. Though resource-ordering technique is not new, novelty of the proposed deadlock prevention algorithm lies in exploiting the relationships among objects present in the domain to do the resource ordering. Resource ordering rules are formally represented using predicate calculus. This algorithm also addresses the elimination of starvation in wealth and starvation in poverty by proposing a combination of timestamp and expedient access ordering of transactions in accessing the resources. (C) 2013 Elsevier Ltd. All rights reserved.

关键词： Starvation Distribute object orientation distributed object system timestamp

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JMonitor: A monitoring tool for distributed systems

JMonitor: A monitoring tool for distributed systems

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IEEE International Conference on systems, Man, and Cybernetics

作者： Mauricio G. Penteado Luis Carlos Trcvelin Computer Science Department Federal University of Sao Carlos Computer Science Department Federal University of Silo Carlos

ISBN: (纸本)9781467317139

Immersive, interactive, and collaborative distributed applications, due to their real time and multi-platform characteristics, require a monitoring structure of their functionalities during the development period, which is not fully available in the current monitoring systems, which are usually specific of the languages and platforms in which they are made available. Monitoring systems that require synchronism of the distributed objects during the processing is a complex task. It is often difficult to check the correct execution of the system. It might be useful for developers and users of such systems to have the ability of identifying, for example, if the reason for the system delay is due to the abusive use of a resource or due to programming mistakes;the identification of which object has crashed, compromising the system as a whole. distributed object systems, also known as SOA (Service Oriented Architecture), generally use middleware of the broker type in their infrastructure and can have a dynamic number of connected clients or servers when running, There are, in the literature, several tools for the monitoring of performance, resources, debugging, and support, among others, of such systems. Nevertheless, the tools available in the literature are limited to programming languages or platforms that are able to process the monitoring agents related to them. In the paper, a tool for the monitoring of distributed object systems is proposed, based on communication described in XML documents, which allows language and platform independence in the such systems development.

关键词： distributed systems Broker JAMP SOA Monitoring systems distributed object system tool monitor system Latency distributed systems monitoring systems Platform systems development development time Language executive system Service-oriented architecture Computer Programming Languages Middleware Servers Developers

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Explicit Batching for distributed objects

Explicit Batching for Distributed Objects

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IEEE International Conference on distributed Computing systems

作者： Eli Tilevich William R. Cook Yang Jiao Computer Science Dept. Virginia Tech Dept. of Computer Sciences The University of Texas at Austin

ISBN: (纸本)9781424444816

Although distributed object systems, including RMI and CORBA, enable object-oriented programs to be easily distributed across a network, achieving acceptable performance usually requires client-specific optimization of server interfaces, making such systems difficult to maintain and evolve. Automatic optimization techniques, including Batched Futures and Communication Restructuring, do not work as well as hand optimization. This paper presents Batched Remote Method Invocation (BRMI), a language-level technique for clients to specify explicit batches of operations on remote objects. We have implemented BRMI for Java as an extension of RMI, with support for batches with array cursors, custom exception handling, conditionals and loops. BRMI allows common design patterns, including Data Transfer objects and Remote object Facade, to be constructed on the fly by clients. The performance benefits of batching operations are well known;our evaluation focuses on the usability of explicit batches, but we also confirm that BRMI outpeiforms RMI and scales significantly better when clients make multiple remote calls. The applicability of BRMI is demonstrated by rewriting third-party RMI client applications to use BRMI.

关键词： remote procedure calls NIH Roadmap Initiative tag customers design pattern distributed object system Clients Common object request broker architecture Explicit Flies Java Java programming language object oriented programming Remote

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Legion: Lessons learned building a grid operating system

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PROCEEDINGS OF THE IEEE 2005年第3期93卷 589-603页

作者： Grimshaw, AS Natrajan, A Univ Virginia Dept Comp Sci Charlottesville VA 22904 USA

Legion was the first integrated grid iniddleware architected from first principles to address the complexity of grid envirounients. Just as a traditional operating system provides an abstract interface to the underlying physical resources of a machine, Legion was designed to provide a powerful virtual machine interface layered over the distributed, heterogeneous, autonomous, and fault-prone physical and logical resources that constitute a grid. We believe that without a solid, integrated, operating system-like grid middleware, grids will fail to cross the chasm from bleeding-edge supercomputing users to more mainstream computing. This paper provides an overview of the architectural principles that drove Legion, a high-level description of the system with complete references to more detailed explanations, and the history of Legion from first inception in August 1993 through commercialization. We present a number of important lessons, both technical and sociological, learned during the course of developing and deploying Legion.

关键词： distributed object system grid grid architecture grid design philosophy large-scale distributed system metaoperating systems metasystems

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A distributed execution environment for shared Java objects

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INFORMATION AND SOFTWARE TECHNOLOGY 2004年第7期46卷 445-455页

作者： Erdogan, N Selcuk, YE Sahingoz, O Tech Univ Istanbul Elect Elect Engn Fac Dept Comp Engn TR-80686 Istanbul Turkey

This paper discusses the implementation of a distributed execution environment, DJO, which supports the use of shared Java objects for parallel and distributed applications and provides the Java programmer with the illusion of a network-wide shared object space on loosely coupled distributed systems. DJO supports shared objects through an implementation of multiple reader/single writer write-invalidate DSM protocol in software, providing the shared memory abstraction at object granularity. object distribution and sharing are implemented through the replication mechanism, transparently to application. The system enforces mutual consistency among replicas of an object. The main benefits of DJO are enhanced availability and performance due to the replicated object model and easier application design, as the underlying software takes care of distribution and memory consistency issues. (C) 2003 Elsevier B.V. All rights reserved.

关键词： replication consistency management concurrency control distributed object system Java

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Administration rights in the SDSD-system

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17th Annual Working Conference on Data and Applications Security

作者： Biskup, J Leineweber, T Parthe, J Univ Dortmund D-44221 Dortmund Germany

ISBN: (纸本)1402080697

The SDSD-system offers state-dependent access control in distributed object systems. The system enforces protocols which declare sets of activity sequences as allowed, thereby forbidding any occurence of an activity outside the context of an allowed sequence. In this paper we conceptually extend the SDSD-system by introducing discretionary administration rights for controlling the activities of declaring, binding and starting SDSD-protocols. Additionally, we introduce second level administration rights for controlling the grant and revoke activities concerning administration rights. Exploiting the powerful potentials of the SDSD-system, the new concepts are implemented by special administration protocols. Administration protocols are enforced with the same techniques already used for application protocols concerning the functionality of the underlying object system. In this environment recursive revocation is shown to be feasible.

关键词： security distributed object system administration of access rights access control state-dependent access rights revoking rights recursive revocation

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Aspects of a massively distributed stable component space

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4th International Conference on Computational Science (ICCS 2004)

作者： Schmaranz, K Schwartmann, D Inst Informat Syst & Comp Media IICM Graz Austria Inst Aerosp Med Cologne Germany

ISBN: (纸本)3540221298

Modern healthcare requires massively distributed virtual electronic patient records. Recent component-based approaches are the best available solutions for the development of such systems. However, all of today's solutions have one very important problem: they do not support consistent and robust object-addressing for the dynamic case, although this is one of the most crucial features in massively distributed environments. The goal that has to be achieved is to replace physical addresses by stable and robust logical handles, managed by a distributed lookup service. Naive implementations suffer from very severe scalability problems that have to be overcome without violating robustness requirements. DOLSA (=distributed object Lookup Service Algorithm) is designed to provide a lookup-based object addressing mechanism that is robust against any kind of object-, server- and network-dynamics. The algorithm is fully scalable in respect to the number of managed mappings, the number of lookup-requests, the number of distributed servers and the number (and frequency) of object movement operations.

关键词： robust globally unique handles distributed object system distributed component system distributed lookup service dinopolis MTP

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Event handling in the J-OCM monitoring system

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5th International Conference on Parallel Processing and Applied Mathematics

作者： Bubak, M Funika, W Smetek, M Kilianski, Z Wismüller, R AGH Univ Sci & Technol Inst Comp Sci PL-30059 Krakow Poland CYFRONET Acad Comp Ctr PL-30950 Krakow Poland Tech Univ Munich LRR D-80290 Munich Germany

ISBN: (纸本)3540219463

The demand for tool support for distributed Java programming is increasing. A universal, open interface between tools and a monitoring system, On-line Monitoring Interface Specification (OMIS), allows to extend the functionality of the OMIS Compliant Monitoring system (OCM) for building a Java oriented monitoring infrastructure which provides all indispensable functions for diverse kinds of tools. The paper presents an approach to dealing with the target Java system in terms of the event model established in the J-OCM.

关键词： Java monitoring system monitoring interface distributed object system OMIS

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Request processing in the Java-oriented OMIS compliant monitoring system

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5th International Conference on Parallel Processing and Applied Mathematics

ISBN: (纸本)3540219463

Performance problems with Java distributed applications due to their complexity, design problems, and communication mechanism motivate building a uniform Java oriented monitoring environment that provides on-line access to the target distributed application and particular elements. A prototype monitoring system, the J-OCM, compliant with the On-line Monitoring Interface Specification (OMIS) concept, provides the ability to observe and manipulate a whole distributed Java application's execution. The paper presents an approach to dealing with the target Java system in terms of components of the distributed system architecture: interface definition, proxy, object manager, naming service, and communication protocol. To follow these approach we consider the stages of processing the requests issued by monitoring based tools like performance analyzers, debuggers, visualizers.

关键词： Java monitoring system monitoring interface distributed object system OMIS

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Monitoring of distributed Java applications

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FUTURE GENERATION COMPUTER systemS-THE INTERNATIONAL JOURNAL OF ESCIENCE 2003年第5期19卷 651-663页

作者： Bubak, M Funika, W Wismüller, R Metel, P Orlowski, R AGH Univ Sci & Technol Inst Comp Sci PL-30059 Krakow Poland CYFRONET Acad Comp Ctr PL-30950 Krakow Poland Univ Vienna Inst Software Sci A-1090 Vienna Austria Tech Univ Munich LRR TUM D-80290 Munich Germany

The paper presents an approach to distributed Java monitoring based on an extension to the on-line monitoring interface specification that defines relationships between a monitoring system and on-line tools used to support the development of Java applications. The extension aims at defining a standard for an open interface that supports on-line software development tools. The paper also presents the implementation ideas on building a monitoring infrastructure based on the specification. This comprises the architecture of the infrastructure, the mechanism of interaction with the Java virtual machine, and sample scenarios of interactions between the tool and the monitoring system. The infrastructure provides a uniform monitoring support for different kinds of tools, like debuggers or performance analysers. (C) 2002 Published by Elsevier Science B.V.

关键词： Java monitoring system monitoring interface distributed object system

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