push and pull

difference with email as example https://motorola-global-eng.custhelp.com/app/answers/detail/a_id/15859/~/what-is-the-difference-between-push-and-pull-email%3F

sns: server push message to client whenever the message is available

sqs: client pull messages from server; server sends out the message only when the client requests.

interesting topic: implement reliable push mechanism



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