Newsfeed System
What is newsfeed
Requirements of a Newsfeed System’s Design
Design of a Newsfeed System
Details
To mitigate the spread of misinformation in newsfeeds, you could implement design-level interventions such as flagging or downranking content that has suspicious origins or lacks verification. Additionally, collaborating with fact-checking organizations to validate information can be highly effective. These measures help ensure the reliability of the content being disseminated to users.
The creation and storage of newsfeeds for each user in the cache requires an enormous amount of memory (step 5 in the above section). Is there any way to reduce this memory consumption?
Details
A memory-efficient way would be to store just the mapping between users and their corresponding posts in a table in the cache, that is., < Post_ID, User_ID>. During the feed publishing phase, the system will retrieve posts from the post database and generate the newsfeed for a user who follows another user with User_ID.
How is the newsfeed of the friends and followers updated when a user creates a new post?
Details
When a user, say Bob, creates a new post, it is stored in the post database and cache. In the next step, the newsfeed generation service generates a newsfeed for Bob’s friends and followers, and the newsfeed cache is updated. The updated newsfeed is delivered to the corresponding users on the next page/screen refresh event.
Evaluation of a Newsfeed System’s Design
Details
The correct choice is to shard the data across multiple database instances. This approach is preferred because it enhances scalability and redundancy, making it more sustainable for handling increased user load compared to just adding more powerful servers, which can lead to bottlenecks and is not a long-term solution.
