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Difficulty: EasyApplication Caching and Session State Management

A developer is implementing a session state store for a web application to allow the application instances to scale horizontally. The application needs to retrieve a user's session record using a unique Session ID. Which approach provides the most efficient and cost-effective design for retrieving these session states?

  1. A
    Store the session states in Amazon DynamoDB and retrieve them using the Scan API operation with a filter expression on the Session ID.
  2. Store the session states in Amazon DynamoDB and retrieve them using the GetItem or Query API operations with the Session ID as the partition key.Answer
  3. C
    Store the session states in AWS Systems Manager Parameter Store and retrieve them using the GetParameter API operation.
  4. D
    Store the session states in Amazon DynamoDB, and provision higher Read Capacity Units (RCUs) to resolve any ProvisionedThroughputExceededException throttling without changing the partition key design.

Answer

Store the session states in Amazon DynamoDB and retrieve them using the GetItem or Query API operations with the Session ID as the partition key.
Storing session data in Amazon DynamoDB and retrieving it using direct key lookups (GetItem or Query) is the AWS best practice for session state management. The Session ID has high cardinality, making it an excellent partition key that distributes requests evenly across partitions, ensuring consistent performance and low latency.

Step-by-Step Solution

1
Identify the requirements for the session store.
The session store needs to hold dynamic session data retrieved via a unique Session ID, support horizontal scaling, and remain cost-effective and efficient.
This sets the criteria for evaluating the database engine and access patterns.
2
Evaluate the database and operation options.
DynamoDB is a key-value store suitable for session state. Retrieving items directly via partition key (GetItem/Query) scales efficiently and keeps read costs low.
Accessing items by key prevents scanning the entire dataset and optimizes RCU usage.

Key Concept

Storing session state in a distributed database like DynamoDB using partition keys for efficient, scalable lookups.
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Topics

Application Caching and Session State Management

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