I'm the author of Data Engineering Design Patterns (O'Reilly),
a Databricks MVP, and
a freelance data engineer specializing in Apache Spark and Databricks.
I help teams move from working pipelines to resilient architectures.
I'm currently accepting new projects for May 2026. Whether you need a 2-day architectural audit, a hands-on lead for a
complex data engineering problem, or a workshop
let's discuss your project here.
Some months ago I presented save modes in Spark SQL. However, this post was limited to their use in files. I was quite surprised to observe some specific behavior of them for RDBMS sinks. Especially for SaveMode.Overwrite.
