Preventing cascade failures in computer systems

A computer program product for preventing a cascading failure in a complex stream computer system, wherein the computer program product comprises a non-transitory computer readable storage device having program instructions embodied therewith, the program instructions readable and executable by a computer to perform a method comprising:

• receiving binary data that identifies multiple subcomponents in a complex stream computer system, wherein identified multiple subcomponents comprise multiple upstream subcomponents that generate multiple outputs and a downstream subcomponent that executes a downstream computational process that uses the multiple outputs, and wherein the multiple upstream subcomponents execute upstream computational processes;
• determining accuracy values by assigning a determined accuracy value to each of the multiple outputs from the multiple upstream subcomponents, wherein determined accuracy values describe a confidence level of an accuracy of each of the multiple outputs;
• determining weighting values by assigning a weighting value to each of multiple inputs to the downstream subcomponent, wherein determined weighting values describes a criticality level of each of the multiple inputs when executing the downstream computational process in the downstream subcomponent;
• utilizing the determined accuracy values and the determined weighting values to dynamically adjust which of the multiple inputs are used by the downstream subcomponent in order to generate an output from the downstream subcomponent that meets a predefined trustworthiness level for making a first type of prediction;
• determining that no variations of execution of one or more functions used by the downstream subcomponent ever produce an output that meets the predefined trustworthiness level for making the first type of prediction;
• and
• in response to determining that no variations of execution of the one or more functions used by the downstream subcomponent ever produce the output that meets the predefined trustworthiness level for making the first type of prediction, executing, by computer hardware, a new downstream computational process that produces a different second type of prediction than that produced by the downstream subcomponent.

A computer system comprising one or more processors, one or more computer readable memories, and one or more computer readable storage mediums, and program instructions stored on at least one of the one or more computer readable storage mediums for execution by at least one of the one or more processors via at least one of the one or more computer readable memories to perform a method comprising:

• receiving binary data that identifies multiple subcomponents in a complex stream computer system, wherein identified multiple subcomponents comprise multiple upstream subcomponents that generate multiple outputs and a downstream subcomponent that executes a downstream computational process that uses the multiple outputs, and wherein the multiple upstream subcomponents execute upstream computational processes;
• determining accuracy values by assigning a determined accuracy value to each of the multiple outputs from the multiple upstream subcomponents, wherein determined accuracy values describe a confidence level of an accuracy of each of the multiple outputs;
• determining weighting values by assigning a weighting value to each of multiple inputs to the downstream subcomponent, wherein determined weighting values describes a criticality level of each of the multiple inputs when executing the downstream computational process in the downstream subcomponent;
• utilizing the determined accuracy values and the determined weighting values to dynamically adjust which of the multiple inputs are used by the downstream subcomponent in order to generate an output from the downstream subcomponent that meets a predefined trustworthiness level for making a first type of prediction;
• determining that no variations of execution of one or more functions used by the downstream subcomponent ever produce an output that meets the predefined trustworthiness level for making the first type of prediction;
• and
• in response to determining that no variations of execution of the one or more functions used by the downstream subcomponent ever produce the output that meets the predefined trustworthiness level for making the first type of prediction, executing, by computer hardware, a new downstream computational process that produces a different second type of prediction than that produced by the downstream subcomponent.