seniorApache Spark
Bucketing vs Partitioning: Senior Decision Matrix.
Updated May 5, 2026
Short answer
Partition on columns used in WHERE filters (low cardinality); Bucket on columns used in JOINs (high cardinality).
Deep explanation
Partitioning creates a folder hierarchy; bucketing creates fixed-size files. Bucketing is a 'contract' that Spark can rely on to avoid shuffles during joins.
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