Apparatus and method for reducing duration of timeout periods in fault-tolerant distributed computer systems
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United States of America Patent
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Mar 26, 2002
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app pub date -
Jan 29, 1999
filing date -
Jan 29, 1999
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Abstract
Apparatus and method to reduce the duration of timeout periods in fault-tolerant distributed computer systems. When nodes execute a task redundantly and communicate their results over a network for further processing, it is customary to calculate timeouts on a worst-case basis, thereby prolonging their duration unnecessarily. By applying Tchebychev's inequality, which holds for any statistical distribution, to adaptively determine the distribution of the arrival times of the results at the point where further processing of those results takes place, the duration of timeouts is reduced. Successively refining the statistical distribution of the arrival times leads to an improved forecast of future arrivals. Thus timeouts are kept to a minimum without compromising the reliability of the system.
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