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System Design Quiz Practice
Active Recall Drill Session
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Question 1 of 1
medium
System Design
For the 'new posts available' count indicator, why is a lightweight count-only mechanism preferred over full live-streaming of new post content?
A
Full live-streaming is technically impossible for feeds
B
The actual requirement is just a count, which is far cheaper to compute and deliver than streaming full post content — matching mechanism weight to actual requirement avoids unnecessary overengineering
C
Counts can only be delivered via polling, never WebSockets
D
There's no meaningful difference in cost between the two approaches
Check Answer