Method for dynamically switching fault tolerance schemes
First Claim
1. A method of dynamically switching among a plurality of fault tolerance schemes associated with a fault tolerance mechanism that executes in a distributed system, the method comprising:
- obtaining a wait time of at least one user interface event occurring in said distributed system, said wait time including at least one of a communications time, a service time and a fault tolerance time;
determining whether a mean of said wait time is greater than a predetermined mean wait time threshold;
determining whether said communications time, said service time and said fault tolerance time are mutually independent when said mean of said wait time is greater than said predetermined mean wait time threshold;
determining whether said mean of said wait time can be improved by reducing a mean of said fault tolerance time when said communications time, said service time and said fault tolerance time are mutually independent; and
switching from a first of said plurality of fault tolerance schemes to a second of said plurality of fault tolerance schemes when said wait time can be improved by reducing said mean of said fault tolerance time.
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Abstract
In one aspect of the invention, a method of dynamically switching among a plurality of fault tolerance schemes is provided. The fault tolerance schemes are associated with a fault tolerance mechanism that executes in a distributed system. The method comprises obtaining a wait time of at least one user interface event occurring in the distributed system. The wait time includes at least one of a communications time, a service time and a fault tolerance time. The method further comprises determining whether a mean of the wait time is greater than a predetermined mean wait time threshold. The method also comprises determining whether the communications time, the service time and the fault tolerance time are mutually independent when the mean of the wait time is greater than the predetermined mean wait time threshold. In addition, the method comprises determining whether the mean of the wait time can be improved by reducing a mean of the fault tolerance time when the communications time, the service time and the fault tolerance time are mutually independent. The method also comprises switching from a first fault tolerance scheme to a second fault tolerance scheme when the wait time can be improved by reducing the mean of the fault tolerance time.
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Citations
18 Claims
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1. A method of dynamically switching among a plurality of fault tolerance schemes associated with a fault tolerance mechanism that executes in a distributed system, the method comprising:
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obtaining a wait time of at least one user interface event occurring in said distributed system, said wait time including at least one of a communications time, a service time and a fault tolerance time;
determining whether a mean of said wait time is greater than a predetermined mean wait time threshold;
determining whether said communications time, said service time and said fault tolerance time are mutually independent when said mean of said wait time is greater than said predetermined mean wait time threshold;
determining whether said mean of said wait time can be improved by reducing a mean of said fault tolerance time when said communications time, said service time and said fault tolerance time are mutually independent; and
switching from a first of said plurality of fault tolerance schemes to a second of said plurality of fault tolerance schemes when said wait time can be improved by reducing said mean of said fault tolerance time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A fault tolerant distributed system capable of dynamically switching among a plurality of fault tolerance schemes associated with a fault tolerance mechanism, the system comprising:
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means for obtaining a wait time of at least one user interface event occurring in said distributed system, said wait time including a communications time, a service time and a fault tolerance time;
means for determining whether a mean of said wait time is greater than a predetermined mean wait time threshold;
means for determining whether said communications time, said service time and said fault tolerance time are mutually independent when said mean of said wait time is greater than said predetermined mean wait time threshold;
means for determining whether said mean of said wait time can be improved by reducing a mean of said fault tolerance time when said communications time, said service time and said fault tolerance time are mutually independent; and
means for switching from a first of said plurality of fault tolerance schemes to a second of said plurality of fault tolerance schemes when said wait time can be improved by reducing said mean of said fault tolerance time. - View Dependent Claims (16, 17, 18)
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Specification