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List functional requirements for the system (Ask the chat bot for hints if stuck.)...
Users should be able to shorten a maximum of 1000 characters.
The shortened URL should map to the original URL.
The system should be able to check for malicious URLS and not shorten them.
Each shortened URL should be unique for each URL.
Availability: 99.9%
Security: Checking for Malicous content, site should be HTTPS secured, Avoiding system overloading.
Latency : 5 seconds maximum.
Estimate the scale of the system you are going to design...
each URL has average length of 1000 characters.
1 M URLS submitted each day for shortening.
1 M modified (short) URLs visited each day.
1 M * 1000 = 1,000,000,000 characters, 1,000,0000,000 bytes. -> 1 GB storage space required.
1 Million read requests.
1 Million write requests (for converting URL to short version).
POST request : /convertURL
{
url:
} -> modified URL
GET request: /getURL/{modifiedURL} -> original URL for visiting.
Key value store: Dynamo DB
{
"key" :
"value" :
}
You should identify enough components that are needed to solve the actual problem from end to end. Also remember to draw a block diagram using the diagramming tool to augment your design. If you are unfamiliar with the tool, you can simply describe your design to the chat bot and ask it to generate a starter diagram for you to modify...
Explain how the request flows from end to end in your high level design. Also you could draw a sequence diagram using the diagramming tool to enhance your explanation...
Dig deeper into 2-3 components and explain in detail how they work. For example, how well does each component scale? Any relevant algorithm or data structure you like to use for a component? Also you could draw a diagram using the diagramming tool to enhance your design...
Explain any trade offs you have made and why you made certain tech choices...
Try to discuss as many failure scenarios/bottlenecks as possible.
What are some future improvements you would make? How would you mitigate the failure scenario(s) you described above?