JioHotstar Android App — Road to 99.9% CFUR
Article Summary
JioHotstar pushed their Android app from 99.5% to 99.8% crash-free rate by hunting down invisible memory killers. Here's how they did it.
With millions of users and 40M+ concurrent viewers during live events, the JioHotstar team obsessed over their Crash Free User Rate (CFUR). They share their systematic approach to eliminating Out Of Memory crashes that were blocking their path to 99.9% CFUR.
Key Takeaways
- Shifted focus from top 10 to top 25 crashes, uncovering OOM pattern affecting 0.3% of users
- Used custom logs to trace user journeys, revealing offline mode content switching triggered crashes
- Memory profiling exposed Lottie cache (8MB), failed network retries, and ViewModel leaks
- Cleared third-party caches, halted offline API calls, refactored event handling to fix leaks
- All top 10 OOM crashes eliminated, pushing CFUR above 99.8% post-deployment
Critical Insight
By profiling specific user journeys and aggressively managing third-party library memory, JioHotstar eliminated 0.3% of crashes that traditional top-10 prioritization missed.
