AWS Certified Solutions Architect - Associate
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A company recently migrated a message processing system to AWS. The system receives messages into an ActiveMQ queue running on an Amazon EC2 instance. Messages are processed by a consumer application running on Amazon EC2. The consumer application processes the messages and writes results to a MySQL database running on Amazon EC2. The company wants this application to be highly available with low operational complexity.
Which architecture offers the HIGHEST availability?
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A
Add a second ActiveMQ server to another Availability Zone. Add an additional consumer EC2 instance in another Availability Zone. Replicate the MySQL database to another Availability Zone.
B
Use Amazon MQ with active/standby brokers configured across two Availability Zones. Add an additional consumer EC2 instance in another Availability Zone. Replicate the MySQL database to another Availability Zone.
C
Use Amazon MQ with active/standby brokers configured across two Availability Zones. Add an additional consumer EC2 instance in another Availability Zone. Use Amazon RDS for MySQL with Multi-AZ enabled.
D
Use Amazon MQ with active/standby brokers configured across two Availability Zones. Add an Auto Scaling group for the consumer EC2 instances across two Availability Zones. Use Amazon RDS for MySQL with Multi-AZ enabled.
Explanation:
Explanation
Option D offers the highest availability because:
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Amazon MQ with active/standby brokers - This is a managed message broker service that provides automatic failover across Availability Zones, reducing operational complexity compared to self-managed ActiveMQ on EC2.
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Auto Scaling group for consumer EC2 instances - This provides automatic scaling and self-healing capabilities. If a consumer instance fails, Auto Scaling will automatically launch a new instance to replace it, ensuring continuous message processing.
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Amazon RDS for MySQL with Multi-AZ enabled - This provides automatic failover for the database with synchronous replication to a standby instance in another Availability Zone, managed by AWS.
Comparison with other options:
- Option A: Uses self-managed components (ActiveMQ on EC2, manual MySQL replication) which increases operational complexity and doesn't provide automatic failover.
- Option B: Improves on A with Amazon MQ, but still uses manual EC2 instance management and manual MySQL replication.
- Option C: Uses Amazon MQ and RDS Multi-AZ, but only has a single additional consumer EC2 instance without auto-scaling or self-healing capabilities.
Key benefits of Option D:
- Managed services reduce operational complexity
- Automatic failover for all components
- Self-healing capabilities through Auto Scaling
- Multi-AZ deployment across all layers
- Highest availability with minimal manual intervention
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