README.md

Integration

What does Amazon SWF stand for?

Simple Work Flow

Your website has premium and free tier members, whose actions are stored in SQS. How can you ensure your premium members have higher priority in your app?

Create one premium tier SQS queue and one free tier SQS queue, then have your app prioritize the actions stored in the premium queue - once it is empty, start working on the free tier queue.

SWF helps users coordinate synchronous and asynchronous _____ 

tasks

SQS can retain stored messages for up to _____

2 weeks (4 days by default)

SQS long polling can wait up to _____

20 seconds

Can SWF create EC2 instances for certain steps?

Yes

Does SQS guarantee no duplicate messages sent?

No

Is an ARN (Amazon Resource Name) created upon creating an SNS topic?

Yes

SNS is a service used for _____

push notifications

SQS visibility timeout can be up to ____

12 hours

S3 Event Notifications events can be sent to _____, _____, _____.

SNS, SQS, Lambda

Is Lambda a valid SNS subscriber?

Yes

Are you charged for polling requests?

Yes

Could you use SWF for a video encoding application, where encoding is done in a number of pre-defined steps?

Yes

Could you use SWF for an application which requires co-ordination between different tasks?

Yes

You can decouple your infrastructure using messaged based queues via _____

SQS

Does SQS guarantee a message will be delivered at least once?

Yes

Does SWF ensure that a task is assigned only once and is never duplicated?

Yes

How could CloudWatch send an alert regarding the billing metrics of an EC2 Instance?

With SNS (Simple Notification Service)

SWF workflows have tasks of type ____ and ____

Activity and Decision

In SWF, a Domain is a collection of related _____

Workflows

SQS is message system that requires worker nodes to poll the _____.

queue

Is SQS a valid SNS subscriber?

Yes

Is e-mail or SMS a valid SNS subscriber?

Yes

Can users be set as SWF "workers" and "deciders"? 

Yes

Using SQS, higher receive performance can be achieved by requesting multiple messages in a single _____

call

You need to process a queue of messages where each message is a task that needs to be completed. This can be achieved via _____

SQS