[FEAT] 🟡 Phase 4: Shadow Reads (Weeks 11-12)

Description

Goal: Query both clusters, compare results, and customers see only 1 result
Timeline: 2 weeks
Business Impact: None - shadow testing only
Status: 📋 Planned

Desired Outcome

Business Outcome:

Customers continue to receive fast, accurate search results from the proven 1.0 cluster while we comprehensively validate that the 3.x cluster produces identical results, building confidence that the new infrastructure is production-ready.

Technical Outcome:

Every search query sent to production is simultaneously executed against both OpenSearch 1.0 and 3.x clusters with results compared in real-time, achieving >99.9% parity and identifying any discrepancies before customer traffic is routed to 3.x, with all differences documented and resolved or accepted.

Target Personas

• Developer teams
• Content teams
• DevOps teams
• System administrators (dotCMS)

Links

No response

The issue names no files, tests, or entry points. Start by locating the production search request path and the configuration for the OpenSearch 1.0 and 3.x clusters. Done means production queries reach both clusters, customers receive only the proven result, comparisons identify discrepancies, and parity exceeds 99.9% with differences documented and resolved or accepted.