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3.4.2. Eventstreams and Event Processors

💡 First Principle: Eventstreams route events from sources to destinations, and event processors provide no-code transformations during routing. Think of it like a mail sorting facility that can also open envelopes, remove junk mail, and repackage before delivery.

Scenario: IoT sensors send data with unnecessary fields (device diagnostics). The event processor removes these columns before storing in the lakehouse, reducing storage costs.

Eventstream Sources

  • Azure Event Hubs
  • Azure IoT Hub
  • Custom applications (SDK)
  • Sample data (for testing)

Eventstream Destinations

  • Lakehouse (Delta tables)
  • KQL Database
  • Derived Eventstream (chaining)
  • Custom endpoint

Event Processor Operations

OperationPurposeUse Case
FilterRemove unwanted eventsDrop diagnostic messages
Manage fieldsSelect/rename columnsRemove unnecessary columns
AggregateCompute statisticsCount events per minute
Group byPartition eventsSeparate by device type
UnionCombine streamsMerge multiple sources

⚠️ Exam Trap: Azure Data Factory is designed for batch orchestration, not real-time event processing. For streaming workloads, use Eventstreams. Questions mentioning "real-time" or "continuous" processing require streaming components, not ADF.

Alvin Varughese
Written byAlvin Varughese
Founder15 professional certifications