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Issues in the next generation of dependability standards

Issues in the next generation of dependability standards

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proceedings of the 1998 9th International symposium on software reliability Engineering, ISSRE

作者： Schneidewind, Norman Laprie, Jean-Claude Nikora, Allen Lyu, Michael Musa, John Everett, Bill Naval Postgraduate Sch

Existing IEEE software reliability standards do not address the characteristics of distributed systems. including client-server systems. Furthermore, these standards were issued before the widespread application of COTS and safety-critical systems. In addition, these standards do not take into account the influence on reliability of such process improvement measures as inspections, reuse, and object-oriented design paradigms. Lastly, these standards do not consider both hardware and software reliability nor do they include availability and maintainability. To be of value, the next generation of dependability standards must address these deficiencies. With the active participation of the audience, the panel will identify and debate the future direction of dependability standards.

关键词： Computer software

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Combined Approach to reliability of Great software Complexes for distributed Computing with Big Data in Contemporary Physical Experiments 2

Combined Approach to Reliability of Great Software Complexes...

引用

2nd International symposium on Stochastic Models in reliability Engineering, Life Science, and Operations Management (SMRLO)

作者： Ososkov, Gennady JINR Lab Informat Technol Dubna Russia

ISBN: (纸本)9781467399418

The new challenging era of scientific data management in the coming decade named "Big Data" requires giant complexes for distributed computing and corresponding grid-cloud internet services. Known common approaches to software reliability based on the probability theory or on considering software as an open non-equilibrium dynamic system cannot conform to advanced grid-cloud software management systems. Therefore to provide the optimality and reliability of such sophisticated systems.we choose the imitative simulation method oriented on a knowledge of dynamics of the system functioning. A new grid and cloud service simulation system was developed in the JINR Dubna laboratory of information technologies which focused on improving the efficiency and reliability of the grid-cloud systems.development by using work quality indicators of some real system to design and predict its evolution. For these purposes the simulation program is combined with real monitoring system of the grid cloud service through a special database. Some examples of the program applications to simulate a sufficiently general cloud structure, which can be used for more common purposes, are given.

关键词： grid computing system cloud computing reliability fault tolerance simulation

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Transaction management in a distributed database system for local area networks

Transaction management in a distributed database system for ...

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Seventh symposium on Reliable distributed systems. proceedings

作者： Rusinkiewicz, Marek Georgakopoulos, Dimitrios Univ of Houston University Park TX USA

ISBN: (纸本)0818608757

The design and implementation of an experimental fault-tolerant distributed database management system is described. The system provides a logically integrated view of data with distribution transparency and a controlled data replication. A commitment protocol used to guarantee atomicity of update operations is discussed. Efficient algorithms used to recover a site from a failure and restore data consistency are described. Recovery can be interleaved with the processing of regular database transactions and does not seriously limit the availability of data. The proposed solutions to the problems of fault recovery are designed to take advantage of the properties of a high-bandwidth local area network.

关键词： database systems

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Invariants Based Failure Diagnosis in distributed Computing systems

Invariants Based Failure Diagnosis in Distributed Computing ...

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29th IEEE International symposium on Reliable distributed systems

作者： Chen, Haifeng Jiang, Guofei Yoshihira, Kenji Saxena, Akhilesh NEC Labs Amer Inc Princeton NJ 08540 USA

ISBN: (纸本)9780769542508

This paper presents an instance based approach to diagnosing failures in computing systems. Owing to the fact that a large portion of occurred failures are repeated ones, our method takes advantage of past experiences by storing historical failures in a database and retrieving similar instances in the occurrence of failure. We extract the system `invariants' by modeling consistent dependencies between system attributes during the operation, and construct a network graph based on the learned invariants. When a failure happens, the status of invariants network, i.e., whether each invariant link is broken or not, provides a view of failure characteristics. We use a high dimensional binary vector to store those failure evidences, and develop a novel algorithm to efficiently retrieve failure signatures from the database. Experimental results in a web based system have demonstrated the effectiveness of our method in diagnosing the injected failures.

关键词： distributed systems Failure Diagnosis Invariants Web based system binary vector distributed computing systems distributed processing graph theory invariant based failure diagnosis network graph software fault tolerance vectors

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A low-cost atomic commit protocol

A low-cost atomic commit protocol

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proceedings of the 9th symposium on Reliable distributed systems

作者： Stamos, James W. Cristian, Flaviu IBM Almaden Res Center San Jose CA USA

The proposed coordinator log transaction execution protocol centralizes logging on a per-transaction basis and exploits piggybacking to provide the semantics of a distributed atomic commit without the associated costs. This protocol eliminates two rounds of messages (one phase) from the presumed commit protocol and dramatically reduces the number of log forces needed for distributed atomic commit. The authors compare the coordinator log transaction execution protocol with existing protocols, describe when it is desirable, and discuss how it affects the write-ahead log protocol and the database crash recovery algorithm.

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...

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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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Exploring Declustered software RAID for Enhanced reliability and Recovery Performance in HPC Storage systems 38

Exploring Declustered Software RAID for Enhanced Reliability...

引用

IEEE 38th International symposium on Reliable distributed systems.(SRDS)

作者： Qiao, Zhi Liang, Shuwen Chen, Hsing-Bung Fu, Song Settlemyer, Bradley Los Alamos Natl Lab Los Alamos NM 87545 USA Univ North Texas Comp Sci & Engn Dept Denton TX 76203 USA Los Alamos Natl Lab HPC DES Grp Los Alamos NM USA

ISBN: (纸本)9781728142227

Redundant array of independent disks (RAID) has been widely used to address the reliability and performance issues of storage systems. As the scale of modern storage systems.continue growing, disk failure becomes the norm. With the ever-increasing disk capacity, RAID recovery based on disk rebuild becomes more and more costly, which causes significant performance degradation and even unavailability of storage systems. Declustered data layout enables parallel RAID reconstruction by shuffling data and parity blocks among all drives (including spares) in a RAID group. However, the reliability and performance of declustered RAID in real-world storage environments have not been thoroughly studied. With the popularity of ZFS file system and software RAID used in production data centers, in this paper, we extensively evaluate declustered RAID with regard to the RAID recovery time and I/O performance on an high performance storage platform at Los Alamos National Laboratory. Our empirical study reveals advantages and disadvantages of the declustered RAID technology. We qualitatively characterize the recovery performance of declustered RAID and compare with that of ZFS RAIDZ under various I/O workloads and access patterns. The experimental results show that the speedup of declustered RAID over traditional RAID is sublinear to the parallelism of recovery I/O. Furthermore, we formally model and analyze the reliability of declustered RAID in terms of the mean-time-to-data-loss (MTTDL) and discover that the improved recovery performance leads to a higher storage reliability compared with the traditional RAID.

关键词： Storage reliability reliability Modeling software RAID Declustered RAID Performance Evaluation

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distributed lock management in a transaction processing environment

Distributed lock management in a transaction processing envi...

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proceedings of the 9th symposium on Reliable distributed systems

作者： Hastings, Andrew B. Sch of Comput Sci Carnegie Mellon Univ Pittsburgh PA USA

distributed synchronization for data sharing is discussed, and the design of a distributed lock manager for the Camelot transaction facility is presented. The lock manager is a component of a proposed implementation of data sharing in the Camelot environment. A number of experiments that demonstrate the correct operation of the lock manager are reported and its performance is described. The performance metrics indicate that distributed lock management should not reduce the feasibility of data sharing in this environment. The similarity between the caching and synchronization strategies appropriate for locks and data suggests that protocols developed for distributed locks will be applicable to data sharing.

关键词： database systems

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Pessimistic protocols for quasi-partitioned distributed database systems

Pessimistic protocols for quasi-partitioned distributed data...

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Seventh symposium on Reliable distributed systems. proceedings

作者： Lilien, Leszek Chung, Tai M. Univ of Illinois Chicago IL USA

ISBN: (纸本)0818608757

The authors propose two protocols for transaction processing in quasi-partitioned databases. The protocols are pessimistic in that they permit the execution of update transactions in exactly one partition. The first protocol is defined for a fully partition-replicated database in which every partition contains a copy of every data object. The second protocol is defined for a partially partition-replicated database in which some objects have no copies in some partitions. Both protocols improve their major performance measures linearly with the backup link speed but are not visibly affected by either duration of the partitioning or the database size. This is a desirable property, since the backup link speed is the only controllable parameter.

关键词： database systems

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FAILURE HANDLING IN distributed PROGRAMMING LANGUAGES.

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

作者： Schlichting, Richard D. Purdin, Titus D.M. Univ of Arizona Tucson AZ USA Univ of Arizona Tucson AZ USA

ISBN: (纸本)0818606908

One property that makes failures difficult to handle in programs is that the actions of a failed component may occur asynchronously with respect to execution of the program. In this study, an approach to dealing with this asynchrony is presented. It is based on treating a failure as an event in a concurrent system of processes, and then integrating failure handling mechanisms into distributed programming languages. The technique is illustrated by considering the class of failures suffered by fail-stop processors, and proposing extensions of the Synchronizing Resources (SR) distributed programming language to handle such failures. Two SR programs using these mechanisms are presented.

关键词： COMPUTER PROGRAMMING LANGUAGES

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