Snapshot Set / Iterator Design

Also reported as Snapshot Set Iterator · SnapshotSet · MVCC Snapshot Set

CodingDatabricksLast reported July 2026High Frequency
Reported
17× across candidate reports
First seen
January 2025
Last reported
July 2026
Also asked in
Phone Screen
Reported outcome
mixed

Problem Overview

Databricks coding question, reconstructed from 17 candidate reports (January 2025 to July 2026). Tests: time-based state (expiry, TTL, snapshots); iterators and generators. Candidates reported 6 follow-ups. The write-up includes a Python solution that passes 11 test cases.

  • 6 candidate-reported follow-ups — the probes candidates report being asked, with the trigger for each
  • The full problem statement — full requirements, constraints, and edge cases
  • Approach and trade-offs — what passing candidates did, and the mistakes that sink people
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Verified Source
Every question is reconstructed from multiple independent candidate reports. Follow-ups candidates reported, not invented ones.
Codex Fact-Checked
Technical claims, formulas, and scale numbers are reviewed against primary sources.
Interviewer Follow-ups
The follow-ups candidates reported, with the trigger that prompts each one — plus the mistakes that sink people.
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