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Difficulty: MediumDatabase High Availability

An organization operates an e-commerce platform using an Amazon Aurora PostgreSQL DB cluster. The cluster consists of one primary DB instance and three Aurora Replicas. During a localized Availability Zone outage affecting the primary instance, the SysOps Administrator needs to ensure that the replica configured with the highest compute specifications is prioritized for promotion to the primary instance during failover.

Which configuration should the administrator modify to guarantee this promotion order?

  1. Assign a promotion tier value of 0 to the high-specification replica, and higher tier values to the remaining replicas.Answer
  2. B
    Configure the Route 53 failover routing policy to map the cluster endpoint directly to the instance endpoint of the high-specification replica.
  3. C
    Configure the high-specification replica as the designated Multi-AZ synchronous standby target and convert the remaining replicas into read-only endpoints.
  4. D
    Assign a promotion tier value of 15 to the high-specification replica, and lower tier values to the remaining replicas.

Answer

Assign a promotion tier value of 0 to the high-specification replica, and higher tier values to the remaining replicas.
The correct option correctly configures the high-specification replica with a promotion tier of 0, which represents the highest promotion priority. Since the other replicas are assigned higher tier numbers (lower priority), Amazon Aurora will always attempt to promote the high-specification replica first during a failover event.

Step-by-Step Solution

1
Analyze the cluster architecture and identify how Amazon Aurora handles failover promotions.
Amazon Aurora promotes one of the existing Aurora Replicas to become the new primary instance during a failover, using a designated promotion tier setting (values 0-15).
Understanding the failover mechanism is necessary to determine which configuration parameter controls replica promotion order.
2
Evaluate the priority order of the promotion tiers.
Replicas in lower-numbered tiers (starting at 0) have higher priority for promotion than those in higher-numbered tiers (up to 15).
Determining the correct priority scale avoids the misconception that larger numbers indicate higher priority.
3
Assign the appropriate promotion tier values to each replica to ensure the high-specification replica is promoted first.
The high-specification replica is configured with tier 0, while the remaining replicas are configured with tier 1 or higher.
Setting the lowest tier value to the targeted replica guarantees it will be evaluated and promoted before the other replicas.

Key Concept

Amazon Aurora Replica Promotion Tiers
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Topics

Database High Availability

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