Performance-Tuning

October 12, 2026 19 min read

GC Pressure in Spark: How to Find It, Read It, and Actually Fix It

GC pressure is the most misdiagnosed failure in Spark, and the one most often ‘fixed’ by adding heap, which usually makes it worse. Here is where to look in the UI and the logs, how to tell it apart from data …

October 11, 2026 7 min read

The Real Math Behind PySpark Resource Sizing

Most Spark tuning guides teach it backwards. Here’s the data-first approach that production engineers actually use.

GC Pressure in Spark: How to Find It, Read It, and Actually Fix It

The Real Math Behind PySpark Resource Sizing

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