Shounak Lohokare

Dec 23, 2024 • 1 min read • 

Understanding Placement Groups in AWS

Understanding Placement Groups in AWS

Placement Groups in AWS are a feature that enables users to control the placement of EC2 instances on underlying hardware, helping optimize performance for different workload requirements.

There are three main types of placement groups:

1) Cluster Placement Group

  • Instances are placed closely together in a single Availability Zone.

  • Ideal for applications requiring low-latency networking and high throughput, such as high-performance computing (HPC) and tightly coupled distributed applications.

  • For example, High-frequency trading platforms rely on Cluster Placement Groups to ensure low-latency communication between trading algorithms and market data feeds. The proximity of instances enables real-time processing and rapid decision-making.

2) Partition Placement Group

  • Instances are distributed across logical partitions, ensuring that instances in one partition do not share the same underlying hardware as those in other partitions.

  • Supports a maximum of seven partitions per Availability Zone.

  • Ideal for applications requiring high availability and resilience against hardware failures.

  • For example, Large distributed systems like Hadoop, Cassandra, and Kafka benefit from Partition Placement Groups by enhancing fault tolerance and ensuring high availability.

3) Spread Placement Group

  • Each instance is placed on distinct underlying hardware to minimize the risk of correlated failures.

  • Ideal for critical applications with a small number of instances that must be isolated from one another.

  • For example, Critical online banking infrastructure uses Spread Placement Groups to ensure high availability by distributing database instances across distinct underlying hardware, reducing the risk of correlated failures.

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