SNS SNS SWF

Question 1

What is SQS?

Answer 1

Web service that gives access to a message queue to store messages while waiting for a computer to process them

Question 2

SQS Message size

Answer 2

Up to 256Kb of text in any format

Question 3

Downside of SQS

Answer 3

Not guaranteed first in first out

Question 4

How does SQS pull task messages from the queue?

Answer 4

Asynchronously, receives named file, processes, completes and deletes

Question 5

SQS timeout

Answer 5

12 hours visibility

Question 6

SQS Billing size

Answer 6

at 64Kb chunks

Question 7

Pricing for SQS

Answer 7

First million free per month

$.5 per 1 million each moth

Question 8

SQS Default message visibility

Answer 8

30 seconds

Question 9

To change visibility time

Answer 9

Use the ChangeMessageVisibility action to specify timeout time

Question 10

Long polling

Answer 10

Way to retrieve messages, but doesn̥t until the poll times out.
For example ec2 sends a message to see if there are messages

Question 11

Maximum long poll timeout

Answer 11

20 seconds

Question 12

Polling in tight loops is burning CPU cycles and costing the company money, how would you fix this?

Answer 12

Long polling

Question 13

Fanning out

Answer 13

Using SNS to pass along SQS messages to other SQS streams

Question 14

SQS was the first service on the AWS platform?

Answer 14

TRUE

Question 15

SQS What is the default visibility time out setting?

Answer 15

30 seconds

Question 16

TF An SQS message can be delivered multiple times.

Answer 16

TRUE

Question 17

You are designing a new application which involves processing payments and delivering promotional emails to customers. You plan to use SQS to help facilitate this. You need to ensure that the payment process takes priority over the creation and delivery of emails. What is the best way to achieve this.

Answer 17

Use 2 SQS queues first with a priority for payments

Question 18

Your EC2 instances download jobs from the SQS queue, however they are taking too long to process them. What API call can you use to extend the length of time to process the jobs?

Answer 18

ChangeMessageVisibility

Question 19

What is the maximum long poll timeout?

Answer 19

20 seconds

Question 20

What amazon service can you use in conjunction with SQS to fan out” SQS messages to multiple queues.”

Answer 20

SNS

Question 21

SNS SF

Answer 21

Simple Notification Services

Question 22

SNS is

Answer 22

Mechanism for push notification system

Question 23

Differences of SNS and SQS

Answer 23

SQS pull/polls

SNS pushes

Question 24

SNS recipient grouping

Answer 24

Recipients are groups in topics

Question 25

SNS topics

Answer 25

Top is an access point for allowing recipients to dynamically subscribe to the same notification

Question 26

SNS Pricing

Answer 26

.50 per 1 million on SNS
.06 per 100K over HTTP
.75 per 100 on SMS
2.00 per 100k over email

Question 27

SNS General Data type

Answer 27

JSON

Question 28

TF SNS is pull based rather than push based?

Answer 28

FALSE

Question 29

SWF SF

Answer 29

Simple workflow service

Question 30

SWF Function

Answer 30

Coordinate work across distributed applications

Question 31

SWF Workers

Answer 31

Programs that get tasks, process and return results

Question 32

SWF Decider

Answer 32

Controls the coordination of tasks

Question 33

Biggest difference between SWF and SQS

Answer 33

In SWF the tasks are only deployed once every time

Question 34

SWF Domains

Answer 34

Parameters in JSON format sent to SWF

Question 35

TF

SWF consists of a domain, workers and deciders?

Answer 35

TRUE

Question 36

Maintaining your application̥s execution state (e.g. which steps have completed, which ones are running, etc.) is a perfect use case for SWF.

Answer 36

TRUE