Pastebin
basic feature
* test or code can share
* can public, private,... (if login)
* such QR code is easy to read
* need preview for message app, that is, metadata
* UX
* login user have longer retation of content
* non login content will loss shorter time
* they have time to test use this product
TA:
* non-coder, easy of use
* simple for mobile user
* quick note sharing link
* number: MAU will 10,000~50,000, scaling up
* 1 million when mature
qps:
* DAU: 20% ratio
* 5 post per day
* 1,000,000 * 20% * 5 / 100,000 = 10 qps
* 3~6 month
* limit 1000 char for each note
volume requirement
* 1,000,000 * 5* 6 * 1kB = 30GB
read/write ratio: 200: 1