Databricks Associate Developer for Apache Spark deep review — September 28, 2026

Read the complete guide and all 32 leaf objectives from the still-linked October 30, 2025 PDF: 7/4/10/3/4/2/2 by domain. No vendor sample questions were reproduced. The weighted objective hash is unchanged. The monitor's changed flag comes from a missing prior lifecycle snapshot, not a demonstrated change to exam status. Accepted snapshots remain untouched.

Repairs

Clarify JDBC partition stride versus row filtering, ANSI default changes, and stateless-streaming AQE support. The stateful-streaming scenario no longer assumes batch/stateless AQE applies.

Separate classic ID-only and ID-plus-time deduplication from within-watermark deduplication. Add original DataFrame fixtures, four decision cases and twelve answered checks. Murali Talluri's January 10, 2025 employee walkthrough supports the comparison method, cross-checked with current upstream references. It was readable through the web tool despite blocked automated collection.

Local validation and deferred blocker

Both Python blocks parse. Ten SQLite assertions verify portable expectations for null filters/counts, deterministic latest-row selection, left-join preservation, duplicate-dimension multiplication and duplicate-preserving union. They do not verify Spark execution.

Attempted isolated Spark 4.2.0 setup in WSL Ubuntu-26.04. An initial temporary environment disappeared when WSL shut down. A second attempt in a persistent location encountered package-host timeouts. Downloaded the official PyPI archive through Windows and verified its SHA-256; subsequent WSL exec startup stalled before the lab ran. Stopped the owned pending Windows launcher commands. No host reboot, global Java/Python installation or cloud deployment was performed.

Blocker for the next session: restore reliable WSL startup or use an authorized disposable Spark environment, then execute the two guide blocks and the retained checkpoint/watermark, Parquet, Arrow/Pandas and restart checks. No Spark or streaming success is claimed; all eight runtime labs remain proposed. Keep this review marked reviewed-with-blockers until that validation is resolved.

Pluralsight's public 11-course/5-lab/9-hour metadata was verified. Academy lessons require sign-in; paid O'Reilly/Udemy metadata and the earlier retirement-thread claim could not be reverified. Independent human review remains pending.