Chapter 4. Example Topology – Twitter

This chapter builds on the material from Chapter 3, Introducing Petrel. In this chapter, we'll build a topology that demonstrates a number of new features and techniques. In particular, we'll see how to:

• Implement a spout that reads from Twitter
• Build topology components based on third-party Python libraries
• Compute statistics and rankings over rolling time periods
• Read custom configuration settings from topology.yaml
• Use "tick tuples" to execute logic on a schedule