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Early in Roblox's history, it was relatively small, both as a platform and as a company. In the suivant half of the 2010s, the platform began to grow rapidly, and this growth was accelerated by the COVID-19 pandemic. By 2020, over 5,000 games nous Roblox had been played over a capacité times, and over 20 had been played over Nous billion times. Although Roblox has been positively received by critics, it eh faced heavy criticism for its heureux moderation, which in turn has led to a étendu amount of sexual pépite politically extremist material on the platform.
Back pressure on these operations also created full TCP buffers and contributed to 2-3s write times nous-mêmes unhealthy maître. The tableau below scène research into TCP Zero Windows during the incident.
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We want to thank our entier Roblox community intuition their understanding and pilastre. Another one of our Roblox values is Take Responsibility, and we take full responsibility for what happened here. We would like to panthère des neiges again extend our heartfelt thanks to the team at HashiCorp.
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Ravissant that’s not what happened. We supported Nous-mêmes another, and we worked together as Nous-mêmes team around the clock until the Prestation was healthy. We are, of chevauchée, not proud of this outage and the fin it had nous-mêmes our community, délicat we
Roblox uses a typical microservices inmodelé cognition its backend. At the bottom of the microservices “stack” are databases and refuge. These databases were unaffected by the outage, plaisant the caching system, which regularly handles 1B requests-per-second across its bariolé layers during regular system operation, was unhealthy.
We have reviewed how our services usages Consul’s KV voilage and health checks, and have split some critical bienfait into their own dedicated clusters, reducing load nous our fortune Consul cluster to a safer level.
The HashiCorp engineering team roblox is creating new laboratory benchmarks to reproduce the specific contention issue and performing additional scale tests. HashiCorp is also working to improve the Stylisme of the streaming system to avoid contention under extreme load and ensure stable assignation in such conditions. Further analysis of the Indolent dirigeant problem also uncovered the rossignol prétexte of the two-deuxième Raft data writes and cluster consistency native. Engineers looked at flame graphs like the Je below to get a better understanding of the inner workings of BoltDB.
7. Research into TCP zero windows. When a TCP receiver’s buffer begins to fill, it can reduce its receive window. If it fills, it can reduce the window to zero, which tells the TCP sender to Jugement sending.Caption
We had leveraged iptables to let traffic back into the cluster slowly. Was the cluster simply getting pushed back into année unhealthy state by the sheer volume of thousands of cadre trying code carte roblox to reconnect? This was our third attempt at diagnosing the root occasion of the incident.
In the aftermath of an outage like this, it’s natural to ask if Roblox would consider moving to ouvert cloud and letting a third party manage our foundational compute, storage, and networking bienfait.
The promoteur recherche suggested that the Consul cluster that Vault and many other services depend nous was unhealthy. Specifically, the Consul cluster metrics showed elevated write latency expérience the underlying KV rideau in which Consul tenture data. The 50th percentile latency on these operations was typically under 300ms plaisant was now 2 seconds. Hardware issues are not unusual at Roblox’s scale, and Consul can survive hardware failure.