SQS Flashcards
How large can an SQS message be?
256KB
128KB
512KB
64KB
256KB
What is the maximum visibility of an SQS message in a queue?
1 day
1 hour
12 hours
14 days
12 hours
You run a video-hosting website with two types of members: premium, fee-paying members; and free members. Each video that is uploaded is processed by a fleet of EC2 instances, which poll an SQS queue as videos are uploaded. However, you need to ensure that the videos uploaded by your premium, fee-paying members have a higher priority than those of your free members. How might you work with SQS to endure priority treatment of the premium members’ videos?
SQS allows you to set priorities on individual items within the queue, so simply set the fee paying members at a higher priority than your free members.
Create two SQS queues — one for premium members, and one for free members. Program your EC2 fleet to poll the premium queue first and, if empty, to then poll your free members SQS queue.
SQS would not be suitable for this scenario. It would be much better to use SNS to encode the videos.
Create two SQS queues — one for premium members, and one for free members. Program your EC2 fleet to poll the premium queue first and, if empty, to then poll your free members SQS queue.
What is the maximum long poll time out?
5 minutes
50 seconds
1 hour
20 seconds
20 seconds
An SQS message can be delivered multiple times.
True or False
True
What is the default visibility timeout for a message in an SQS queue?
15 minutes
30 seconds
1 minute
1 year
30 seconds
Which Amazon service can you use in conjunction with SQS to “fan out” SQS messages to multiple queues.
SWF
SNS
SES
ElastiCache
SNS
Your EC2 instances download jobs from an SQS queue. However, they are taking too long to process the messages. What API call can you use to extend the length of time to process the jobs?
AlterMessageTime
SetMessageVisibility
ExtendMessageTime
ChangeMessageVisibility
ChangeMessageVisibility
You are designing a new application that processes payments and delivers promotional emails to customers. You need to ensure that the payment process takes priority over the creation and delivery of emails. How might you use SQS to achieve this.
Use 1 SQS queue for the platform. Use the SetPriority API call to ensure that all payment SQS messages take priority over the promotional email messages.
Use 1 SQS queue for the platform. Use the HighPriority API call to ensure that all payment SQS messages take priority over the promotional email messages.
Use 2 SQS queues for the platform. Have the EC2 fleet poll the payment SQS queue first. If this queue is empty, then poll the promotional emails queue.
Use 2 SQS queues for the platform. Have the EC2 fleet poll the promotional emails SQS queue first. If this queue is empty, then poll the payment emails queue.
Use 2 SQS queues for the platform. Have the EC2 fleet poll the payment SQS queue first. If this queue is empty, then poll the promotional emails queue.
You have a fleet of EC2 instances that are constantly polling empty SQS queues, burning CPU cycles and costing your company money. What should you do?
Consider using ElastiCache to cache the messages, rather than SQS.
Enable SQS Short Polling.
Delete the entire EC2 fleet so that they no longer poll the queue.
Enable SQS Long Polling.
Enable SQS Long Polling.
What is the maximum retention period for an SQS message?
1 hour
1 day
12 hours
14 days
14 days
SQS was the first service on the AWS platform?
True or False?
True
