Distributing Read Traffic to Amazon RDS Read Replicas

Answer: A.

Option A is CORRECT because it is possible to create a Route 53 hosted zone and record set to store the DNS endpoints of the RDS read replica instances.Each endpoint should have the same value for the weighted routing configuration to ensure equal distribution of traffic among the RDS read replicas.

Option B is incorrect because Network Load Balancer does not support RDS endpoints as a load balancing target type.

IP addresses or EC2 Instance IDs are the only supported target types.

Option C is incorrect because Application Load Balancer does not support RDS endpoints as a load balancing target type.

IP addresses, instance IDs, or Lambda functions are the only supported target types.

Option D is incorrect because Amazon RDS does not support the reader endpoint with automatic load-balancing of read traffic.

This feature is only available for Amazon Aurora.

The question does not specify that this is an Amazon Aurora cluster.

Reference:

https://aws.amazon.com/premiumsupport/knowledge-center/requests-rds-read-replicas/ https://docs.aws.amazon.com/elasticloadbalancing/latest/network/target-group-register-targets.html https://docs.aws.amazon.com/elasticloadbalancing/latest/application/load-balancer-target-groups.html#target-type

When multiple Amazon RDS Read Replicas have been configured, the read traffic can be distributed among them to improve the performance of the application. There are several ways to distribute the read traffic, but the optimal solution depends on the specific requirements and constraints of the application.

Option A: Add each read replica endpoint to a Route 53 record set. Use a Weighted routing policy to distribute the traffic.

This option involves using Amazon Route 53 to distribute the traffic among the read replicas. Route 53 is a DNS service that can be used to route traffic to different endpoints based on various criteria, such as geographic location, latency, or a simple weighted distribution.

To use this option, you would create a Route 53 record set that includes the endpoints of each read replica. You could then use a Weighted routing policy to distribute the traffic among the replicas. The Weighted routing policy allows you to specify the proportion of traffic that should be sent to each endpoint. For example, you could send 50% of the traffic to one replica and 50% to another.

One advantage of this option is that it is simple to set up and does not require any additional infrastructure. However, it may not be the most effective solution for applications with complex traffic patterns.

Option B: Create a Network Load Balancer. Register each read replica endpoint with the load balancer target group.

This option involves using an AWS Network Load Balancer (NLB) to distribute the traffic among the read replicas. An NLB is a high-performance, low-latency load balancer that is designed for use with TCP traffic.

To use this option, you would create an NLB and register each read replica endpoint with the load balancer target group. The NLB would then distribute the traffic among the replicas based on various criteria, such as round-robin or least connections.

One advantage of this option is that NLBs are highly scalable and can handle large amounts of traffic. They are also highly available and can automatically recover from failures. However, NLBs can be more expensive than other load balancing options.

Option C: Create an Application Load Balancer. Register each read replica endpoint with the load balancer target group.

This option involves using an AWS Application Load Balancer (ALB) to distribute the traffic among the read replicas. An ALB is a load balancer that is designed for use with HTTP and HTTPS traffic.

To use this option, you would create an ALB and register each read replica endpoint with the load balancer target group. The ALB would then distribute the traffic among the replicas based on various criteria, such as URL or host-based routing.

One advantage of this option is that ALBs provide advanced traffic routing features, such as content-based routing and request routing based on URL patterns. They are also highly available and can automatically recover from failures. However, ALBs may not be as performant as NLBs for TCP traffic.

Option D: Amazon RDS has a cluster reader endpoint xxx.cluster-ro-xxxxxx.us-east1.rds.amazonaws.com that provides load-balancing for read traffic.

This option involves using the cluster reader endpoint provided by Amazon RDS to distribute the traffic among the read replicas. The cluster reader endpoint is a DNS endpoint that is automatically created when you configure read replicas for an RDS instance.

To use this option, you would simply use the cluster reader endpoint in your application to read from the database. Amazon RDS would automatically distribute the traffic among the read replicas based on various criteria, such as replication lag and available resources.

One advantage of this option is that it is the simplest solution and does not require any additional infrastructure. However, it may not be the most effective solution for applications with complex traffic patterns.

In summary, the optimal solution for distributing read traffic to Amazon RDS read replicas