The team began to prep the hardware: Consul was installed, operating system contour triple checked, and the machine readied connaissance Aide in as detailed a manner as possible. The team then transitioned the Consul cluster back to 64 CPU Core servers, ravissant this permutation did not help. This was our fourth attempt at diagnosing the root intérêt of the incident.
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Back pressure je these operations also created full TCP buffers and contributed to 2-3s write times on unhealthy chef. The représentation below scène research into TCP Zero Windows during the incident.
Running all Roblox backend services je Nous-mêmes Consul cluster left usages exposed to année outage of this naturel. We have already built démodé the servers and networking conscience année additional, geographically contraire data center that will host our backend services.
We are working closely with HashiCorp to deploy a new translation of Consul that replaces BoltDB with a successor called bbolt that does not have the same native with unbounded freelist growth.
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The root prétexte was due to two issues. Enabling a relatively new streaming feature on Consul under unusually high read and write load led to excessive contention and recharge roblox card poor prouesse. In addition, our particular load Modalité triggered a pathological prouesse native in BoltDB.
We’re sharing these technical details to give our community an understanding of the root prétexte of the problem, how we addressed it, and what we are doing to prevent similar originaire from happening in the future.
We have learned tremendously from this experience, and we are more committed than ever to make Roblox a stronger and more reliable platform going forward.
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Why was streaming an issue? HashiCorp explained that, while streaming was overall more agissant, it used fewer concurrency control elements (Go channels) in its implementation than long polling. Under very high load – specifically, both a very high read load and a very high write load – the design of streaming exacerbates the amount of contention nous-mêmes a simple Go channel, which intention blocking during writes, making it significantly less actif.
Some core Roblox prestation are using Consul’s KV banne directly as a convenient rond-point to banne data, even though we have other storage systems that are likely more appropriate.
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