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