ACTIVE-ACTIVE

Active-active topology. See Enterprise Integration Patterns.

Definition

Active-active — high availability topology where two or more nodes simultaneously process traffic, without a primary/secondary distinction.

Origin

Pattern documented in Designing Distributed Systems (Burns, 2018) and the Google SRE literature. An advanced replication variant, superior to active-passive in throughput but more complex in consistency.

Use

A critical B2B/EDI gateway in active-active mode exposes two AS2 endpoints behind a load balancer; MDNs flow back to the same message bus to ensure traceability regardless of which node processed the payload.

Related

• ACTIVE PASSIVE — see entry.
• B2B GATEWAY — see entry.
• IDEMPOTENCY — see entry.