Implement a Concurrent Buffered File Logger
Company: Databricks
Role: Software Engineer
Category: Software Engineering Fundamentals
Difficulty: medium
Interview Round: Onsite
Overview: Design a logger that accepts writes from many threads, buffers records, and appends them safely to one file while preserving a documented ordering guarantee. Make the API or object boundaries explicit, then cover invariants, edge cases, testing strategy, and operational trade-offs.
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