ОЦІНКА ВІДНОВЛЕННЯ РОЗПОДІЛЕНИХ СИСТЕМ ПІСЛЯ ЗБОЇВ У ДОДАТКАХ ПОТОКОВОЇ ОБРОБКИ ДАНИХ: РОЗУМІННЯ МЕТРИК З ТОЧКИ ЗОРУ БІЗНЕСУ

Context. Stream processing frameworks are widely used across industries like finance, e-commerce, and IoT to process real-time data streams efficiently. However, most benchmarking methodologies fail to replicate production-like environments, resulting in an incomplete evaluation of fault recovery performance. The object of this study is to evaluate stream processing frameworks under realistic conditions, considering preloaded state stores and business-oriented metrics.Objective. The aim of this study is to propose a novel benchmarking methodology that simulates production environments with varying disk load states and introduces SLO-based metrics to assess the fault recovery performance of stream processing frameworks.Method. The methodology involves conducting a series of experiments. The experiments were conducted on synthetic data generated by application using Kafka Streams in a Docker-based virtualized environment. The experiments evaluate system performance under three disk load scenarios: 0%, 50%, and 80% disk utilization. Synthetic failures are introduced during runtime, and key metrics such as throughput, latency, and consumer lag are tracked using JMX, Prometheus, and Grafana. The Business Fault Tolerance Impact (BFTI) metric is introduced to aggregate technical indicators into a simplified value, reflecting the business impact of fault recovery.Results. The developed indicators have been implemented in software and investigated for solving the problems of Fisher’s Iris classification. The approach for evaluating fault tolerance in distributed stream processing systems has been implemented, additionally, the investigated effect on system performance under different disk utilization.Conclusions. The findings underscore the importance of simulating real-world production environments in stream processingbenchmarks. The experiments demonstrate that disk load significantly affects fault recovery performance. Systems with disk utilization exceeding 80% show increased recovery times by 2.7 times and latency degradation up to fivefold compared to 0% disk load. The introduction of SLO-based metrics highlights the connection between system performance and business outcomes, providing stakeholders with more intuitive insights into application resilience. The findings underscore the importance of simulating real-world production environments in stream processing benchmarks. The BFTI metric provides a novel approach to translating technical performance into business-relevant indicators. Future work should explore adaptive SLO-based metrics, framework comparisons, and long-term performance studies to further bridge the gap between technical benchmarks and business needs.