Design News Feed
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1. Pull: Clients can pull the News Feed contents from the server on a regular basis or manually whenever they need it.
Cons:
Possible problems with this approach are
a) New data might not be shown to the users until clients issue a pull request
b) Most of the time pull requests will result in an empty response if there is no new data.
2. Push: Servers can push new data to the users as soon as it is available.
To efficiently manage this, users have to maintain a request with the server for receiving the updates.
Cons:
A possible problem with this approach is, a user who follows a lot of people or a celebrity user who has millions of followers; in this case, the server has to push updates quite frequently.
3. Hybrid: We can adopt a hybrid approach.
We can move all the users who have a high number of follows to a pull-based model and only push data to those users who have a few hundred (or thousand) follows.
Another approach could be that the server pushes updates to all the users not more than a certain frequency, letting users with a lot of follows/updates to regularly pull data.
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