Data Transfer Cost
Anything that copies data across a boundary repeatedly is where the charge lives. Often worth it — the point is knowing you bought it.
-
-
Stateless Service
Cache in the instance, keep truth outside it. The difference decides whether a restart is routine or an incident.
-
Three Streaming Engines, Three Answers: Spark, Flink, and Kafka Streams
The choice is rarely about features. It is about the latency you actually need, how much state you will carry, and whether you want a cluster to operate.