Which recommendation would resolve this issue?

A company is releasing a new mobile game featuring a team play mode. As a group of mobile device users play together, an item containing their statuses is updated in an Amazon DynamoDB table. Periodically, the other users’ devices read the latest statuses of their teammates from the table using the BatchGetltemn operation.

Prior to launch, some testers submitted bug reports claiming that the status data they were seeing in the game was not up-to-date. The developers are unable to replicate this issue and have asked a database specialist for a recommendation.

Which recommendation would resolve this issue?
A . Ensure the DynamoDB table is configured to be always consistent.
B. Ensure the BatchGetltem operation is called with the ConsistentRead parameter set to false.
C. Enable a stream on the DynamoDB table and subscribe each device to the stream to ensure all devices receive up-to-date status information.
D. Ensure the BatchGetltem operation is called with the ConsistentRead parameter set to true.

View Answer

Answer: D

Explanation:

https://docs.aws.amazon.com/ja_jp/amazondynamodb/latest/developerguide/API_BatchGetItem_v20111205.html

By default, BatchGetItem performs eventually consistent reads on every table in the request. If you want strongly consistent reads instead, you can set ConsistentRead to true for any or all tables.