Fan-out/Fan-in / Coordination Overhead
Kind: tension
Record: tension:coordination-overhead-fan-out-fan-in
Canonical: Schema
"fan-out-fan-in" (execution-core layer) is traded against "Coordination Overhead" (execution-core layer) — a principle cannot be scope-separated from a quality, metric, or cost it competes with; resolve by measuring "Coordination Overhead" and choosing an explicit operating point.
Listed in Tensions, after Windowing / Late-Data Handling and before Fan-out/Fan-in / Serial Item Processing.