Application Services Flashcards
What is SQS?
Can be used as a message queue for applications
Is SQS pull or push based?
pull
What is the size of SQS messages?
256
What is the SQS visibility timeout max?
12 hours
How long can SQS messages stay in queue?
1 min to 14 days. Default is 4 days
What is the SQS visibility timeout?
Amount of time that a message is invidible in queue after a reader picks up that message
What happens if an SQS job processes a message before the invisibility time out expires?
it is deleted
What happens if an SQS job processes does not process a before the visibility time out expires?
The message becomes visible again for another reader to process
What is the difference between SQS short and long polling?
Short polling will return a response immediately even if the queue is empty. Long polling doesn’t return a response until a message arrives in the queue.
What are the SQS queue types?
FIFO or standard
What is the max retention for SWF?
1 year
Which message service presents a task orientated API?
SWF
Which message service offers a message orientated API?
SQS
Which message service ensure that a message is only delivered once?
SWF
Which message service keeps track of events?
SWF
Which service requires application level tracking?
SQS
What are the three SWF actors?
Workflow starterDecidersActivity worker
What are the SNS subscribers?
HTTP
HTTPS
email–json
jsonSQSlambdaapplication
What are SNS and SQS?
messaging services
You need a push based message service
SNS
What is elastic transcoder?
media transcoder in the cloud
What are the three kinesis types?
stream firehoseanalytics
What is kinesis stream?s
kinesis streams breaks up incoming data into shards and pipes to EC2 consumers
What is kinesis firehose?
Firehose accepts streams data to S3 with almbda quering
What is kinesis stream?s
kinesis streams break’s up incoming data into shards and pipes to EC2 consumers
What is kinesis firehose?
Firehose accepts and streams data to S3 with lambda query’
What service decouples application components to run independently?
SQS
What is the max size of an SQS message?
256KB
What are the two types of SQS queues?
Standard FIFO
Which SQL queue would you use if you need unlimited messages and best effort ordering?
standard
Which SQL queue would you use if you need unlimited messages and correct ordering?
FIFO
Is SQS pull or push based?
Pull
What AWS application service would you use to coordinate work across applications?
SWF
What SWF component interacts with SWF to get tasks?
Workers
What SWF component controls coordination of tasks
Deciders
What SWF component would you use to isolate SWF worflows
Domains
What is the max SWF length?
I year
What AWS application service would you use to send notifications from the cloud to SMS or email?
SNS
What AWS application service would you use to transcode media?
Elastic transcoder
What AWS application service would you use to manage APIs?
API gw
Can API gateway provide caching to improve performance?
Yes
What AWS application service would you use to send streaming data to for analysis?
kinesis
What are the three types of kinesis services?
AnalysticsStreaming Firehose
Which kinesis service would you use to accept data from multiple sources to store for 24 hours to 7 days that are then forwarded to consumers?
Streams
Which kinesis service would you use to accept data from multiple sources to analyze in real time to then store in S3?
Firehose
Which kinesis service would you use to perform SQL queries on kinesis streams or firehose?
analytics
What is cognito
Provides login federation using FB, google , amazon
How does cognito work?
Authenticates with web ID provider, recieve temporary token, exchange with AWS credentials to provide access by allowing them to assume role
What is a cognito user pool?
User based, handles authentication, registration and account recovery.
What service does cognito identity pools provide?
Authorizes access to AWS resources
What are the SQS message sizes?
256 KB
How long can SQS messages stay in a queue?
1 min to 14 days, default is 4 days
What is the difference between SNS and SQS?
SNS is a push notification service, whereas SQS is message system that requires worker nodes to poll a queue.
What happens when you create a topic on Amazon SNS?
An Amazon Resource Name is created.
