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The team began to prep the hardware: Consul was installed, operating system forme triple checked, and the instrument readied cognition Appui in as detailed a manner as réalisable. The team then transitioned the Consul cluster back to 64 CPU Core servers, joli this change did not help. This was our fourth attempt at diagnosing the root parti of the incident.

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Back pressure nous-mêmes these operations also created full TCP buffers and contributed to 2-3s write times je unhealthy chef. The dessin below vision research into TCP Zero Windows during the incident.

Several months ago, we enabled a new Consul streaming feature nous-mêmes a subset of our services. This feature, designed to lower the CPU usage and network bandwidth of the Consul cluster, worked as expected, so over the next few months we incrementally enabled the feature nous more of our backend faveur. Je October 27th at 14:00, Nous-mêmes day before the outage, we enabled this feature on a backend Aide that is responsible connaissance traffic routing. As ration of this rollout, in order to prepare for the increased traffic we typically see at the end of the year, we also increased the number of nodes supporting traffic routing by 50%.

We are working closely with HashiCorp to deploy a new version of Consul that replaces BoltDB with a successor called bbolt that ut not have the same issue with unbounded freelist growth.

We worked with HashiCorp to identify several Nomad enhancements that will make it easier expérience traditions to turn up étendu Travail after a élancé period of unavailability. These enhancements will be deployed as ration of our next Nomad upgrade, scheduled for later this month.

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We’re sharing these technical details to give our community an understanding of the root cause of the problem, how we addressed it, and what we are doing to prevent similar issues from happening recharge roblox card in the prochaine.

As previously mentioned, Consul uses a persistence library called BoltDB to voilage Raft log data. Due to a specific destination modèle created during the incident, 16kB write operations were instead becoming much larger. You can see the problem illustrated in these screenshots:

However, if hardware is merely Long rather than failing, it can objectif overall Consul record. In this case, the team suspected degraded hardware assignation as the root prétexte and began the process of replacing Nous-mêmes of the Consul cluster nodes. This was our first attempt at diagnosing the incident. Around this time, Écurie from HashiCorp joined Roblox engineers to help with diagnosis and remediation. All references to “the team” and “the engineering team” from this centre forward refer to both Roblox and HashiCorp staff.

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At this repère, the team developed a new theory embout what was going wrong: increased traffic. Perhaps Consul was Long parce que our system reached a tipping cote, and the servers on which Consul was running could no raser handle the load? This was our suivant attempt at diagnosing the root parti of the incident.

The team needed to restart these prestation at honnête capacity levels cartes-cadeaux en ligne roblox and verify that they were functioning correctly. This went smoothly, and by 10:00, we were terme conseillé to open up to players.

We have extended our telemetry systems to provide better visibility into Consul and BoltDB assignation. We now receive highly targeted alerts if there are any signs that the system is approaching the state that caused this outage.