Google Cloud Platform for Developers

BigQuery as a Cloud Dataflow Sink

Writing Cloud Dataflow results to BigQuery is a very common pattern for both stream ingestion and batch ETL processes. Dataflow provides a very powerful basis for transforming and conditioning data for storage, and BigQuery provides fast and expressive ad-hoc exploration of that data. Cloud Dataflow provides first-class support for integrating with BigQuery via the BigQueryIO reader and writer.

BigQueryIO automatically adapts how it writes to BigQuery based on whether the pipeline is processing bounded or unbounded data. For bounded datasets, BigQueryIO performs inserts using batch file uploads. For unbounded datasets, inserts are performed using streaming insert API calls. This behavior can be overridden ...