Design Logging library like log4j - Machine CodingSubhahu Jain·Dec 19, 2024·6 min readTable of contentsFeatures RequiredDesign Patterns InvolvedMultiple Algorithms InvolvedSolution (Java)→ Issues in above design🔥 Problem 1: Logger Is NOT Thread-Safe (Silent Log Corruption)❌ What we Did❌ Why This Is DangerousSolution🔥 Problem 2: Synchronous Logging = Latency Time Bomb❌ What we Did❌ Why This Is FatalSolution🔥 Problem 3: AsyncAppender Is the HARDEST Part (and It’s Missing)❌ Claimed Feature❌ Reality💣 Why Async Logging Is HardSolution🔥 Problem 4: FileAppender Flushes on Every Log (Throughput Killer)❌ What we Did❌ Why This Destroys PerformanceSolution🔥 Problem 5: Singleton LogManager = Global Contention Point❌ What we Did❌ Why This Is Subtle but DeadlySolution🔥 Problem 6: Configuration Reload Is Not Thread-Safe❌ Claimed Feature❌ Actual CodeSolution🔥 Problem 7: Filters Are Mentioned but Not Designed❌ Missing CompletelySolutionNote
