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AWS Certified Solutions Architect - Associate · AWS
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Apart from the fact that BCD distribute the instances across AZ which is bad for inter-node network latency, I think the following article is really useful in understanding A: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html
• Launching instances within a single AZ and using a cluster placement group provides the lowest network latency and highest bandwidth between instances. This maximizes performance for an in-memory database and high-throughput application. • Communications between instances in the same AZ and placement group are free, minimizing data transfer charges. Inter-AZ and public IP traffic can incur charges. • A cluster placement group enables the instances to be placed close together within the AZ, allowing the high network throughput required. Partition groups span AZs, reducing bandwidth.
Cluster placement group packs instances close together inside an Availability Zone. This strategy enables workloads to achieve the low-latency network performance.