SIDE-BY-SIDE-VALIDATION

Side-by-side validation. See Enterprise Integration Patterns.

Definition

Side-by-side validation — practice of automatically comparing the output of an old mapping and a new mapping on the same inputs to detect any functional divergence.

Origin

Pattern documented in data engineering (BigQuery shadow queries, Spark dual write). Adapted to EDI to secure an EDIFACT → UBL migration or an EDIFACT version upgrade D.96A → D.10B.

Use

On 10,000 real messages, the old and new mappings must produce outputs identical to the tag; discrepancies are filed as tickets and fixed before cutover.

Related

• DUAL RUN — see entry.
• CUTOVER WINDOW — see entry.
• PRE VALIDATION — see entry.