In this chapter, we started with Flink's most powerful API: DataStream API. We looked at how data sources, transformations, and sinks work together. Then we looked at various technology connectors such as ElasticSearch, Cassandra, Kafka, RabbitMQ, and so on.

At the end, we also tried to apply our learning to solve a real-world sensor data analytics use case.

In the next chapter, we are going to learn about another very important API from Flink's ecosystem point of view the DataSet API.