Extension Design Patterns for Twitch Scale
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Karl Patrick, a senior backend software engineer at Twitch, discusses scaling challenges for Twitch extensions during his talk at TwitchCon 2018. He emphasizes the importance of handling traffic spikes effectively through strategies such as using pubsub for event updates, randomizing wait times, and managing write traffic to prevent spam. Key tactics include being lazy in requests, spreading out traffic, and using fake early responses to enhance user experience during high-demand situations.
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We will explore how e-commerce projects prepare for the busiest time of the year, which key aspects to focus on, and what to expect. Well share our experience in setting up auto-scaling, load balancing, and discuss the loads that Silpo handles, as well as the solutions that help us navigate this season without failures.You are not excused! How to avoid security blind spots on the way to production
You are not excused! How to avoid security blind spots on the way to productionMichele Leroux Bustamante
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Extension Design Patterns for Twitch Scale
- 1. Extensions Developer Services Team @MovingViolation Karl Patrick Senior Backend Software Engineer
- 2. Extension Design Patterns for Twitch Scale
- 3. TwitchCon 2018 San Jose, California @XPCagey 15 years of experience prior to Twitch Single person hobby projects to AAA titles Build/Tools/Engine/Server/Gameplay Karl Patrick Game Developer
- 4. TwitchCon 2018 San Jose, California Extensions Usually Fail to Scale -Popular technologies dont work for high-volume channels -False starts with high-profile Extensions inspired this talk -High concurrent users is only part of the story TWITCH SCALE
- 5. TwitchCon 2018 San Jose, California - When a streamer activates Extensions during a stream - When a channel is raided by another audience - When viewers refresh due to a technical issue Traffic Spikes 10,000x traffic in One Second WHATS THE BIG DEAL? ~20 viewers / 10 seconds 40,000 viewers / 10 seconds
- 6. TwitchCon 2018 San Jose, California How can Extensions Scale for Traffic Bursts? TwitchCon 2018 San Jose, California Server
- 7. TwitchCon 2018 San Jose, CaliforniaTwitchCon 2018 San Jose, California Server Twitch PubSub Call Twitch PubSub from your service to push events instead of polling for updates. If you need to whisper secrets, shout the list of people who need to ask for them instead of having every user ask. Use a Megaphone SCALING READS
- 8. TwitchCon 2018 San Jose, California Be Lazy: Wait Before You Ask for Data - Use a splash screen when you first load your Extension - Schedule your requests after a pause - Cancel the request if it is answered while youre waiting SCALING READS Document loads Schedule request PubSub sent before timer expires? Cancel request Send request Yes No
- 9. TwitchCon 2018 San Jose, California Roll the Dice: Randomize Your Wait Time SCALING READS - Make each client pick a number instead of using one delay - Jitter will spread out traffic if clients load at the same time Spread out work with a random delay All requests at one time
- 10. TwitchCon 2018 San Jose, California - Tell clients how long they can wait to respond - Roll the dice on each client and cancel if the response comes while waiting - On each client request, add more wait time to the next response - Larger audiences automatically get longer waits and lower traffic per viewer Listen to Yourself: Send Wait Times From the Server SCALING READS Server Send time remaining Use time to decide when to send Add time on every request PubSub
- 11. TwitchCon 2018 San Jose, California Green Purple Orange Blue Whats your favorite color? What About Interactive Extensions?
- 12. TwitchCon 2018 San Jose, California - Authorize requests and use cool downs to prevent spam - Popular Extensions have seen attempts to spam within 20 minutes of release - Chrome developer tools make it simple to repeat service requests Stop Cheaters SCALING WRITES !
- 13. TwitchCon 2018 San Jose, California - Be lazy and roll the dice to spread write traffic; listen to yourself to make sure you answer in time - Predict and apply fake responses while youre waiting - Once you have a real response, replace the fake one Start Cheating: Fake Early Responses SCALING WRITES User Clicks Schedule & Send Request Service Calculates Result PubSub Message Arrives Show Result
- 14. TwitchCon 2018 San Jose, California Take Command: Batch Frequent Requests SCALING WRITES
- 15. How can Extensions Scale for Traffic Bursts? - Use a Megaphone - Listen to Yourself - Be Lazy - Roll the Dice - Stop Cheaters - Start Cheating - Take Command
- 16. Questions?