Scale

For the 100 million Dream11 users, the thrill and excitement of playing fantasy sports on our platform is unparalleled. They enjoy creating their own teams and competing with fellow fans and friends! However, from a backend perspective, there are various challenges we face in terms of variation in traffic and engagement on Dream11 majorly before the match start time.

On Mar 11th, 2021, ZIO Http was finally released at the ZIO World Conference, by Dream11. ZIO Http is a library that is used to build highly performant HTTP-based services and clients using functional scala and ZIO. We got a surprisingly overwhelming response from the scala community after its launch, which compelled us to write about the adventure we had building it.

At a time when we are collectively homebound, thanks to the pandemic, the Dream11 Indian Premier League (IPL) 2020 came like a breath of fresh air for cricket fans everywhere. Not only did the **Dream11 IPL 2020** fill an otherwise gaping void in the realm of sports this year, but it also kept our passion for cricket, a thread that binds us together, burning as brightly as ever.

Our Leaderboard has already served 1 million requests per minute, serving 250k concurrent users at its peak. As our user base grows, we expected the request pattern to grow by a much larger magnitude. So, we needed to design a system that would linearly scale as our traffic increases. It should be able to crunch gigabytes of data using distributed sorting within a SLA (Service Level Agreement) of under a minute, while maintaining strong consistency of different user views across multiple platforms. The persistent systems used should support millions of input/output operations per second, while maintaining throughput and latency under the strict SLA desired.This is done to ensure that our users have a seamless experience across platforms and devices at all times.