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A router raises prefix-cache hits but worsens tail latency. Replay its decisions and find the missing state.

Replay the same burst through affinity, round-robin and predicted-finish routing. Then remove local reservations or delay an eviction notice and explain exactly why the decisions change.

Updated Oct 2026 · Worked answers on inference mechanisms, with calculations, implementation details, and follow-up questions.

Replay the same burst through affinity, round-robin and predicted-finish routing. Then remove local reservations or delay an eviction notice and explain exactly why the decisions change.

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FEDITOR'S NOTE

Record what the router knew at dispatch, including report timestamps and assignments made since that report. Reconstructing decisions from the worker's later state gives the router information it never had.

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