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Issue No. 02 - February (2009 vol. 20)
ISSN: 1045-9219
pp: 180-190
Maria Chtepen , Ghent University - IBBT, Gent
Filip H.A. Claeys , CTO MOSTforWATER N.V., Belgium
Bart Dhoedt , Ghent University - IBBT, Gent
Filip De Turck , Ghent University - IBBT, Gent
Piet Demeester , Ghent University - IBBT, Gent
Peter A. Vanrolleghem , Université Laval, Québec
A grid is a distributed computational and storage environment often composed of heterogeneous autonomously managed subsystems. As a result, varying resource availability becomes commonplace, often resulting in loss and delay of executing jobs. To ensure good grid performance, fault tolerance should be taken into account. Commonly utilized techniques for providing fault tolerance in distributed systems are periodic job checkpointing and replication. While very robust, both techniques can delay job execution if inappropriate checkpointing intervals and replica numbers are chosen. This paper introduces several heuristics that dynamically adapt the abovementioned parameters based on information on grid status to provide high job throughput in the presence of failure while reducing the system overhead. Furthermore, a novel fault-tolerant algorithm combining checkpointing and replication is presented. The proposed methods are evaluated in a newly developed grid simulation environment Dynamic Scheduling in Distributed Environments (DSiDE), which allows for easy modeling of dynamic system and job behavior. Simulations are run employing workload and system parameters derived from logs that were collected from several large-scale parallel production systems. Experiments have shown that adaptive approaches can considerably improve system performance, while the preference for one of the solutions depends on particular system characteristics, such as load, job submission patterns, and failure frequency.
Distributed systems, performance of systems, fault tolerance, availability.

P. A. Vanrolleghem, P. Demeester, F. H. Claeys, B. Dhoedt, M. Chtepen and F. De Turck, "Adaptive Task Checkpointing and Replication: Toward Efficient Fault-Tolerant Grids," in IEEE Transactions on Parallel & Distributed Systems, vol. 20, no. , pp. 180-190, 2008.
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