Optimistic Locking - What, When, Why, and How?

System Design for SDE-2 and above: https://arpitbhayani.me/masterclass System Design for Beginners: https://arpitbhayani.me/sys-design Redis Internals: https://arpitbhayani.me/redis Build Your Own Redis / DNS / BitTorrent / SQLite - with CodeCrafters. Sign up and get 40% off - https://app.codecrafters.io/join?via=arpitbbhayani In the video, I explained how optimistic locking can be used as an alternative to pessimistic locking in multi-threaded programs to improve performance. By utilizing the compare and swap semantic, optimistic locking allows one thread to succeed while another fails, reducing contention and improving throughput. I demonstrated the implementation of optimistic locking using a simple C code example and discussed its advantages and disadvantages. Leveraging the underlying CPU architecture for atomic operations is key to efficient optimistic locking. Overall, understanding and implementing optimistic locking can significantly enhance system performance. # Recommended videos and playlists If you liked this video, you will find the following videos and playlists helpful System Design: https://www.youtube.com/watch?v=o7qLKfILuD8&list=PLsdq-3Z1EPT27BuTnJ_trF7BsaTpYLqst Designing Microservices: https://www.youtube.com/watch?v=JPj6mhVLQN0&list=PLsdq-3Z1EPT0ug8eizS71G6LZb6-4FAFt Database Engineering: https://www.youtube.com/watch?v=-htbah3eCYg&list=PLsdq-3Z1EPT2C-Da7Jscr7NptGcIZgQ2l&pp=gAQBiAQB Concurrency In-depth: https://www.youtube.com/watch?v=2PjlaUnrAMQ&list=PLsdq-3Z1EPT3VjDhjMb5yBsgn0wn2-fjp Research paper dissections: https://www.youtube.com/watch?v=LXhgFAZroG8&list=PLsdq-3Z1EPT2XEJ0AmF02LBK1RFNd-jK8 Outage Dissections: https://www.youtube.com/watch?v=LeT_s-UFw-U&list=PLsdq-3Z1EPT3_Z97svMs6S2y7tv1PcUmc Hash Table Internals: https://www.youtube.com/watch?v=jjW8w8ED3Ns&list=PLsdq-3Z1EPT2UnueESBLReaVSLIo_BuAc Bittorrent Internals: https://www.youtube.com/watch?v=v7cR0ZolaUA&list=PLsdq-3Z1EPT1rNeq2GXpnivaWINnOaCd0 # Things you will find amusing Knowledge Base: https://arpitbhayani.me/knowledge-base Bookshelf: https://arpitbhayani.me/bookshelf Papershelf: https://arpitbhayani.me/papershelf # Other socials I keep writing and sharing my practical experience and learnings every day, so if you resonate then follow along. I keep it no fluff. LinkedIn: https://linkedin.com/in/arpitbhayani Twitter: https://twitter.com/arpit_bhayani Weekly Newsletter: https://arpit.substack.com Thank you for watching and supporting! it means a ton. I am on a mission to bring out the best engineering stories from around the world and make you all fall in love with engineering. If you resonate with this then follow along, I always keep it no-fluff.