Any real-time application is expected to be available all the time with no stoppage whatsoever. The event collection, processing, and storage components should be configured with the underlined assumptions of high availability. Any failure to any components will cause major disruptions to the running of the business. For example, in a credit card fraud detection application, all the fraudulent transactions need to be declined. If the application stops midway and is unable to decline fraudulent transactions, then it will result in heavy losses.
Continuous availability
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