Lambda-less Stream Processing @Scale in LinkedIn The document discusses challenges with stream processing including data accuracy and reprocessing. It proposes a "lambda-less" approach using windowed computations and handling late and out-of-order events to produce eventually correct results. Samza is used to implement stream processing jobs with local state stored durably in Kafka. This avoids duplicating code for real-time and batch processing while supporting reprocessing through resetting offsets. The approach scales to large datasets by using Hadoop for offline experimentation before pushing logic online.