Diagnosing and Fixing Java Heap Space OOM During Spark Shuffles
Learn how to diagnose and resolve Java heap space OutOfMemoryErrors during Apache Spark shuffles, including identifying data skew and optimizing shuffle partitions.
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Learn how to diagnose and resolve Java heap space OutOfMemoryErrors during Apache Spark shuffles, including identifying data skew and optimizing shuffle partitions.
AQE can switch join strategies and split skewed partitions, but only at shuffle boundaries. A worked configuration, how to verify the plan changed, and where it stops helping.
Static query planning in Apache Spark often fails because the optimizer makes decisions using stale statistics. Adaptive Query Execution (AQE) solves this by re-planning the query plan at runtime based on actual data statistics collected during shuffle operations.