Happens-Before Relationship / Parallel Execution
Kind: tension
Record: tension:happens-before-relationship-parallel-execution
Canonical: Schema
"happens-before-relationship" (causality-core layer) is traded against "Parallel Execution" (causality-core layer) — a principle cannot be scope-separated from a quality, metric, or cost it competes with; resolve by measuring "Parallel Execution" and choosing an explicit operating point.
Listed in Tensions, after Causal Consistency / Latency/Availability and before Event Ordering / Throughput.