Design a news feed - Machine CodingSubhahu Jain·Jan 13, 2023·7 min readTable of contentsCodeIssues in Above Design🔥 Problem 1: Observer Pattern = Notification Disaster❌ What we Did❌ Why This Is a Critical Design FlawSolution🔥 Problem 2: NewsFeed Is a God Object❌ What we Did❌ Why This Is DangerousSolution🔥 Problem 3: Feed Retrieval Is O(N) and Unscalable❌ What we Did❌ Why This Will Never WorkSolution🔥 Problem 4: No Personalization Model at All❌ What’s MissingSolution🔥 Problem 5: Concurrency Is Completely Ignored❌ What we Did❌ Why This Is FatalSolution🔥 Problem 6: Topics Are the Wrong Abstraction for Feeds❌ What we Modeled❌ Why This Is NaiveSolution🔥 Problem 7: Decorator Pattern Misused for Core Data❌ What we Did❌ Why This Is WrongSolution🔥 Problem 8: Time-Based Queries Are Naive❌ What we Did❌ Why This FailsSolutionJavaScriptPythonGeneral ProgrammingProgramming BlogsJava
