Use a batch processing approach to process the data in large batches, ignoring the real-time requirements of the recommendation system.

Optimize the pipeline for transactional processing by ensuring data consistency and atomicity, but do not consider the real-time requirements.

Optimize the pipeline for analytical processing by focusing on data aggregation, windowing, and stateful processing, but do not consider the real-time requirements.

Optimize the pipeline for real-time processing by focusing on low latency, high throughput, and efficient data processing techniques, such as data aggregation, windowing, and stateful processing.