Jun 15, 2026 · 11 min · 10 segments
Your Spark job has been running for forty minutes. The dashboard shows your cluster isn't even busy. So you do the obvious thing: add more workers. And it changes nothing. Here's why. During a…
JR LasakHost
It's the reason adding workers sometimes makes things worse, and you could probably name what triggers it without being able to say what actually happens inside it.
By the end of this walk, you'll picture it as one thing you've stood in yourself, an airport baggage claim, and you'll know exactly why your next wide transformation crawls.
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It's the reason adding workers sometimes makes things worse, and you could probably name what triggers it without being able to say what actually happens inside it.
By the end of this walk, you'll picture it as one thing you've stood in yourself, an airport baggage claim, and you'll know exactly why your next wide transformation crawls.
