Design a Write-Ahead Log Writer with Batch Writes
Company: Databricks
Role: Software Engineer
Category: Software Engineering Fundamentals
Difficulty: hard
Interview Round: Onsite
Overview: Design a concurrent write-ahead-log writer that assigns ordered positions, groups records into bounded batches, and states exactly when durability is acknowledged. Candidates reason about framing, checksums, group commit, crash recovery, torn tails, backpressure, ambiguous outcomes, shutdown, and concurrency testing.
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