Mobility

Fault Tolerant Evaluation of Continuous Selection Queries Over Sensor Data

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Executive Summary

The authors consider the problem of evaluating continuous selection queries over sensor generated values in the presence of faults. Small sensors are fragile, have finite energy and memory, and communicate over a lossy medium; hence, tuples produced by them may not reach the querying node, resulting in an incomplete and ambiguous answer, as any of the non-reporting sensors may have produced a tuple which was lost. They develop a protocol, FAult Tolerant Evaluation of Continuous Selection Queries (FATE-CSQ), which guarantees a user-requested level of quality in an efficient manner. When many faults occur, this may not be achievable; in that case, they aim for the best possible answer, under the query's time constraints.

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