In distributed systems, retries are inevitable. From network errors to replication issues and even outages in downstream dependencies, services operating at a massive scale must be prepared to encounter, identify, and handle failure as gracefully as possible. Given the scope and pace at which Uber operates, our systems must be fault-tolerant and uncompromising when it comes to failing intelligently. To accomplish this, we leverage Apache Kafka , an open source distributed messaging platform, which has been industry-tested for delivering high performance at scale. This strategy helps our opt-in Driver Injury Protection program run reliably in more than cities, deducting per-mile premiums per trip for enrolled drivers. In this article, we highlight our approach for reprocessing requests in large systems with real-time SLAs and share lessons learned.
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