"Seeing Double in BigQuery? Fix it Fast! ? #shorts
The Solution: Exactly-Once Processing ?️
If your Pub/Sub stream is leaking duplicates into BigQuery, the fix is a simple toggle: enable exactly-once processing in Dataflow. This configuration change ensures every message is processed and written once, eliminating duplicates at the source without a single line of extra code. It’s the most efficient way to keep your clickstream data clean and accurate while meeting the "minimal change" requirement.
Why skip the cleanup?
Avoid "ix-it-later" traps like BigQuery SQL deduplication or complex stack swaps to Kafka. Buffering in Cloud Storage adds overhead but fails to address the root cause: Pub/Sub’s default "at-least-once" delivery behavior. Dataflow’s exactly-once feature handles the heavy lifting of state management and checkpointing, making it the textbook solution for a reliable, serverless GCP data pipeline. ?
#GCP #DataEngineering #BigQuery #Dataflow #PubSub #DataDeduplication #GoogleCloud #CloudComputing #DataPipeline #TechTips #StudyGuide #BigData #GCPCertification