# Implement a Concurrent Buffered File Logger Design a logger that accepts writes from many threads, buffers records, and appends them safely to one file while preserving a documented ordering guarantee. ### Constraints & Assumptions - Records must not interleave or be silently lost. - Disk errors and shutdown are observable. ### Clarifying Questions to Ask - Is ordering by call acquisition sufficient? - May producers block when the buffer is full? ### What a Strong Answer Covers - Synchronization, bounded buffering, a writer loop, flush, and shutdown. - Backpressure, error propagation, and performance trade-offs. ### Follow-up Questions - How would rotation work? - How would crash durability change the design?