---
title: "Discussion on \"Shuffles in Spark: Why groupBy Kills Performance\" | Hashnode"
description: "Discussion on \"Shuffles in Spark: Why groupBy Kills Performance\". A Spark shuffle moves every matching key across the network — understanding when and why is the difference between a 2-minute and 2-hour job"
url: "https://hashnode.com/posts/spark-shuffles-groupby-performance/69e437d76e738bcf4b61fc32"
---

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# [Shuffles in Spark: Why groupBy Kills Performance](https://abstractalgorithms.hashnode.dev/spark-shuffles-groupby-performance?utm_source=hashnode&utm_medium=feed)

A Spark shuffle moves every matching key across the network — understanding when and why is the difference between a 2-minute and 2-hour job

Apr 19 · 31 min read · abstractalgorithms.hashnode.dev  
Updated Jun 18  
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-   [#apache-spark](https://hashnode.com/tag/apache-spark)
-   [#performance](https://hashnode.com/tag/performance)
-   [#shuffle](https://hashnode.com/tag/shuffle)
-   [#intermediate](https://hashnode.com/tag/intermediate)

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