Why it matters

Version migrations are risky. Understanding shapes safe upgrade.

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The architecture

Read release notes.

Test in staging.

Migrate gradually.

Migration processRead release notesbreaking changesTest in stagingwith real dataMigrate graduallycluster by clusterSpark 2 → 3 was breaking; 3.x → 4.x will follow similar pattern
Migration approach.
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How it works end to end

Deprecations: warnings first, removal later.

Performance: AQE + other features enabled by default in 3.2+.

Libraries: check compat.

Rollback plan: essential.