Apache Kafka - Real-time Stream Processing (Master Class) - Caution with States

The video tutorial addresses a problem in Kafka stream processing where invoices from different stores are partitioned based on store ID, leading to issues with local state stores. The solution involves ensuring all invoices for a customer are sent to the same partition, either by changing the message key to customer ID or using a custom partitioner. The tutorial explains how to implement these solutions using Kafka's API, emphasizing the importance of repartitioning and its impact on performance.

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