4.1 Volume, variety, and velocity4.2 Model view controller (MVC), and Streams4.3 Flow rate sensor: Example application we create4.3.1 Sample output from our flow rate sensor4.3.2 Flow rate sensor: First ingest, heartbeat generator4.3.3 Flow rate sensor: Actual ingest, parsing semi-structured data4.3.4 Flow rate sensor: React phase (simulated)4.3.5 Flow rate sensor: User defined functions, (read-only) maps4.3.6 Flow rate sensor: Analyze, read-write maps, windows, other4.4 Conclusion, how to proceed