How I Fixed a Data Ingestion Bottleneck With Date Partitioning

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I fixed a recurring data ingestion bottleneck by working with a vendor to introduce date-partitioned exports and reduce unnecessary file discovery.
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Our vendor-data ingestion jobs were repeatedly enumerating a growing history of export files. I worked with the vendor's engineers on date-partitioned delivery and prepared our consumer in parallel. This case study explains how partitioning bounds file discovery, why event-date partitions need late-arrival and replay policies, and how to coordinate the producer-consumer cutover.