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检索条件"任意字段=Proceedings - Third Symposium on Reliability in Distributed Software and Database Systems."

共 369 条记录，以下是71-80 订阅

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IMPLEMENTING FAULT-TOLERANT distributed OBJECTS.

IMPLEMENTING FAULT-TOLERANT DISTRIBUTED OBJECTS.

引用

proceedings - Fourth symposium on reliability in distributed software and database systems.

作者： Birman, Kenneth P. Joseph, Thomas A. Raeuchle, Thomas El Abbadi, Amr Cornell Univ Dep of Computer Science Ithaca NY USA Cornell Univ Dep of Computer Science Ithaca NY USA

ISBN: (纸本)0818605642

A technique is described for implementing k-resilient objects, i. e. , distributed objects that remain available, and whose operations are guaranteed to progress to completion, despite up to k site failures. The implementation is derived from the object specification automatically, and does not require any information beyond what would be required for a nonresilient, nondistributed implementation. It is therefore unnecessary for an applications programmer to have knowledge of the complex protocols normally used to implement fault-tolerant objects. The technique is used in ISIS, a system being developed at Cornell to support resilient objects.

关键词： COMPUTER software

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BUGNET: A REAL TIME distributed DEBUGGING SYSTEM.

BUGNET: A REAL TIME DISTRIBUTED DEBUGGING SYSTEM.

引用

proceedings - Sixth symposium on reliability in distributed software and database systems.

作者： Jones, Stuart H. Barkan, Robert H. Wittie, Larry D. Apollo Computer Chelmsford MA USA Apollo Computer Chelmsford MA USA

ISBN: (纸本)0818607378

A description is given of Bugnet, a portable Unix system designed to debug distributed programs. It gives the user information about interprocess communication, I/O events, and execution traces of each component process. Bugnet allows the programmer to detect an error situation, roll back to a time in the event sequence before the error, and replay events exactly as they occurred prior to the error. It reproduces real-time execution error sequences with an accuracy of 0. 2s. A graphics interface allows the user to manage process groups and monitor process interactions very conveniently.

关键词： database systems

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MULTI-LEVEL CONCURRENCY CONTROL OF A database SYSTEM.

MULTI-LEVEL CONCURRENCY CONTROL OF A DATABASE SYSTEM.

引用

proceedings - Fourth symposium on reliability in distributed software and database systems.

作者： Minoura, Toshimi Oregon State Univ Dep of Computer Science Corvallis OR USA Oregon State Univ Dep of Computer Science Corvallis OR USA

ISBN: (纸本)0818605642

A typical database system maintains target data, which contain information useful for users, and access path data, which facilitate faster accesses to target data. Further, most large database systems.support concurrent processing of multiple transactions. For a static database system model, where units of concurrency control are not dynamically created or deleted, various concurrency control methods are known. Also, many methods that allow concurrent accesses to indexing structures without invalidating their integrity are known. However, a straightforward integration of these two kinds of concurrency control methods fails because of the phantom problem. The author introduces group locks in order to solve this problem and discusses their implementation. It is shown that if the lowest-level access path data as well as the target data are two-phase locked by transactions, consistency of the logical data will be preserved.

关键词： database systems

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SYNCHRONIZATION OF REDUNDANT COMPUTATION IN A distributed SYSTEM.

SYNCHRONIZATION OF REDUNDANT COMPUTATION IN A DISTRIBUTED SY...

引用

proceedings - Sixth symposium on reliability in distributed software and database systems.

作者： Natarajan, N. Tang, Jian Pennsylvania State Univ University Park PA USA Pennsylvania State Univ University Park PA USA

ISBN: (纸本)0818607378

An environment is considered in which interprocess communication is only through messages, and modular redundancy is used at the level of processes to increase availability. It is assumed that failing processes do not malfunction, i. e. , there is no Byzantine fault. It is also assumed that link failures do not occur. If such replicated processes exercise choice during communication, they have to be coordianted so that the replicas make the same choice. A centralized scheme is presented for this choice coordination problem in which a master makes the choice, which is then obeyed by others. The scheme incorporates protocols for recovering from master failures, and for reintroducing processes after repair. A correctness proof for the scheme is presented.

关键词： database systems

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PERFORMANCE EVALUATION OF distributed CONCURRENCY CONTROL MECHANISMS.

PERFORMANCE EVALUATION OF DISTRIBUTED CONCURRENCY CONTROL ME...

引用

proceedings - Fourth symposium on reliability in distributed software and database systems.

作者： Ford, Ray Shultz, Roger Jipping, Michael Univ of Iowa Dep of Computer Science Iowa City IA USA Univ of Iowa Dep of Computer Science Iowa City IA USA

ISBN: (纸本)0818605642

For performance evaluation of distributed systems.and concurrency control mechanisms, several concurrent tree algorithms with dynamic, distributed concurrency control have been proposed that combine selective locking policies and 'built-in' recovery mechanisms in place of more centralized concurrency control. Claims have been made that such algorithms allow a high degree of reliability and an improved degree of concurrency over traditional approaches. Because concurrency control mechanisms regulate the potential interference between concurrent processes, they have a dramatic effect on these aspects of system performance. An evaluation methodology that has been used to test these claims is described. The methodology combines evaluation of a prototype implementation of a concurrent system with simulation of the system on a more ambitious scale using a general-purpose multiprocessor simulation system. Results for the particular system on the degree of concurrency, degree of interference, and frequency of recovery generally supports the performance claims for the distributed concurrency-control mechanisms.

关键词： COMPUTER systems. DIGITAL

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PERFORMANCE MODELING OF database RECOVERY PROTOCOLS.

PERFORMANCE MODELING OF DATABASE RECOVERY PROTOCOLS.

引用

proceedings - Fourth symposium on reliability in distributed software and database systems.

作者： Griffeth, Nancy Miller, John A. Georgia Inst of Technology Sch of Information & Computer Science Atlanta GA USA Georgia Inst of Technology Sch of Information & Computer Science Atlanta GA USA

ISBN: (纸本)0818605642

Several protocols that ensure that a database can be recovered to a consistent state after a transaction failure or system crash are compared. The study includes a collection of simple analytic models, based on Markov processes, for these protocols and some surprising results on the relative performance of the protocols. The authors consider only two-stage transactions (all reads before writes) and ignore effects of serializing transactions. The most interesting performance result presented is that, for systems.obeying the assumptions of this paper, the 'pessimistic' policy of holding write locks to commit point is considerably less efficient than the 'optimistic' policy that allows reading of uncommitted data but risks cascading aborts. A multiversion policy was also studied and found always to be nearly as good as the optimistic policy and sometimes much better.

关键词： database systems

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ORDERING ACTIONS FOR VISIBILITY.

ORDERING ACTIONS FOR VISIBILITY.

引用

proceedings - Fourth symposium on reliability in distributed software and database systems.

作者： McKendry, Martin S. Georgia Inst of Technology Sch of Information & Computer Science Atlanta GA USA Georgia Inst of Technology Sch of Information & Computer Science Atlanta GA USA

ISBN: (纸本)0818605642

Examples to illustrate requirements for ordering mechanisms are introduced. A model of nested actions is then used as a basis for categorizing visibility requirements. These requirements go beyond those typical of database systems. because often the entities managed by operating systems.cannot be recovered if an action fails. Several simplifications that apply to many operating system problems are discussed. Algorithms for controlling ordering are then presented, with examples of their use. Several expediencies that result from ordering requirements are established. In many situations, recovery for nested actions can be implemented with a single backup copy of each item, a single synchronization variable can be used to control blocking, and generalized locking is not required. These savings appear to be fundamental to making the object-action approach viable for operating system construction.

关键词： database systems

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Resilient Mechanism Against Byzantine Failure for distributed Deep Reinforcement Learning 33

Resilient Mechanism Against Byzantine Failure for Distribute...

引用

33rd IEEE International symposium on software reliability Engineering (ISSRE)

作者： Zhang, Mingyue Jin, Zhi Hou, Jian Luo, Renwei Peking Univ Sch Comp Sci Beijing Peoples R China Zhejiang Sci Tech Univ Sch Informat Sci & Technol Hangzhou Peoples R China Univ Elect Sci & Technol Sch Comp Sci & Engn Chengdu Peoples R China

ISBN: (纸本)9781665451321

distributed deep reinforcement learning(DDRL) has been used in distributed systems.to better improve the adaptability. However, DDRL-based systems.are also inevitably under the threat of Byzantine workers. There is an urgent need to enhance the resilience of the DDRL-based system against Byzantine failures. This paper proposes a resilient mechanism for mitigating the influence of Byzantine workers on DDRL-based systems. First, we formalize the DDRL-based system as a multi-armed bandit model for well capturing the collective effect of workers on the whole learning process, and then transforming the resilient mechanism design problem into the sampling policy optimization problem. Second, we propose a self-adaptation process for filtering out the harmful data generated by Byzantine workers and theoretically give a mathematical analysis of the understanding, demonstrating its effectiveness under ideal conditions. third, based on a typical DDRL-based system (i.e., Asynchronous Advantage Actor-Critic, A3C), we implement a resilient distributed A3C (ReD-A3C). With extensive experiments on the DDRL benchmark tasks, we show that ReD-A3C outperforms available Byzantine tolerant approaches.

关键词： distributed learning Reinforcement learning System resilience Byzantine failure

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RELIABLE AND SECURE UNIX CONNECTION SERVICE.

RELIABLE AND SECURE UNIX CONNECTION SERVICE.

引用

proceedings - Sixth symposium on reliability in distributed software and database systems.

作者： Draheim, Dennis Miller, Barton Snyder, Steven Univ of Wisconsin Madison WI USA Univ of Wisconsin Madison WI USA

ISBN: (纸本)0818607378

One way for processes residing on different machines to identify each other and establish communication is through a special connection service. A connection service for Berkeley Unix has been implemented that is reliable, available, secure, and easy to use. The connection service achieves ease of use through a simple interface based on the library routine meet. Meet allows one process to connect to another by specifying arbitrary names for itself and the other process. The connection service imposes no naming conventions of its own so it can be used with most name spaces and naming services. The service is location-transparent. It also provides a routine for posting services. Reliable and available service is provided by replicating connection servers.

关键词： database systems

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OPERATING SYSTEM SUPPORT FOR software MIGRATION IN A distributed SYSTEM.

引用

Fifth symposium on reliability in distributed software and database systems.- proceedings.

作者： Zicari, Roberto Politecnico di Milano Milan Italy Politecnico di Milano Milan Italy

ISBN: (纸本)0818606908

A controversial point in designing a distributed system is whether the user or the system should be responsible for taking actions as a consequence of system failures. The author proposes a dynamic configuration scheme for runtime reconfiguration of application software that is more flexible than existing proposals. A description is given of a reconfigurable scheme implemented by the operating system which only requires that software components be virtually connected. The authors demonstrate that the scheme increases the reliability and availability of distributed systems. and compare and contrast this scheme with other similar proposals.

关键词： COMPUTER systems. DIGITAL

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