What roles do Spout and Bolt play in Storm?

In Storm, Spouts and Bolts are two distinct roles used for processing data streams.

1. Spout acts as a data source in Storm, responsible for reading data from external sources such as message queues, files, databases, and sending the data to the Storm topology. Spout continuously reads data from the source and sends it to Bolts for further processing.
2. Bolt is a data processing unit in Storm that is responsible for processing and converting the received data, and then sending the processed data to the next Bolt or final data storage destination. Bolt can perform various data processing operations, such as filtering, aggregating, and calculating.

The message passing mechanism in Storm enables data exchange between Spout and Bolt, forming the data processing flow in Storm. By combining and configuring Spout and Bolt in different ways, various complex data processing tasks can be achieved.