Fault Tolerance: Redundancy Instead of Single Points of Failure

Fault Tolerance: Redundancy Instead of Single Points of Failure An architecture diagram generated by Archify. Users · web / mobile · Architecture component Users web / mobile Load Balancer · health checks · Architecture component Load Balancer health checks Service Node A · stateless handlers · Availability Zone A Service Node A stateless handlers Primary DB · writes accepted · Availability Zone A · AZ-a Primary DB writes accepted AZ-a Service Node B · stateless handlers · Availability Zone B Service Node B stateless handlers Replica DB · failover target · Availability Zone B · AZ-b Replica DB failover target AZ-b HTTPS route request failover read / write read / write async replication Availability Zone A Availability Zone B Legend Backend Database Cloud External