SNS

· The "event producer" only send messages to one sns Topic

· As many "event receivers" (subscriptions) as we want to listen to the SNS topic notifications

· Each subscriber to the topic will get all the messages (note new feature to filter messages)

· Up to 10,000,000 subscriptions per topic

· 100,000 topics

· Subscribers can be

o SQS

o HTTP/HTTPS (with delivery retries - how many times)

o Lamda

o Emails

o SMS messages

o Mobile notifications(push)

SNS Publish

· Topic Publish

o Create a topic

o create a subscription(for many)

o publish to topic

· Direct Publish (for mobile app SDK)

o Create a platform application

o Create a platform endpoint

o Publish to platform endpoint

o Works with Google GCM, Apple APNS, Amazon ADM

SQS + SNS FAN OUT

o Push once in SNS, receive many in SQS

o Fully Decoupled

o No data loss

o Ability to add receivers of data later

o SQS allows for delayed processing

o SQS allows for retries of work

o May have many workers on one queue and one worker on the other queue