The team began to prep the hardware: Consul was installed, operating system apparence triple checked, and the mécanique readied connaissance Bienfait in as detailed a manner as réalisable. The team then transitioned the Consul cluster back to 64 CPU Core servers, but this échange did not help. This was our fourth attempt at diagnosing the root cause of the incident.
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Even though Roblox did not have any abîmer-generated traffic flowing through the system at this cote, internal Roblox bienfait were still Direct and dutifully reaching dépassé to Consul to learn the location of their dependencies and to update their health récente. These reads and writes were generating a significant load nous-mêmes the cluster. We were worried that this load might immediately push the cluster back into an unhealthy state even if the cluster reset was successful. To address this concern, we configured iptables on the cluster to block access. This would allow habitudes to bring the cluster back up in a controlled way and help us understand if the load we were putting nous Consul independent of user traffic was part of the problem.
Several months ago, we enabled a new Consul streaming feature je a subset of our services. This feature, designed to lower the CPU destination 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 prestation. Nous October 27th at 14:00, one day before the outage, we enabled this feature nous-mêmes a backend Bienfait that is responsible for traffic routing. As portion of this rollout, in order to prepare expérience the increased traffic we typically see at the end of the year, we also increased the number of nodes supporting traffic routing by 50%.
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In order to run thousands of servers across multiple sites, we leverage a technology suite commonly known as the “HashiStack.
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At this abscisse, the team developed a new theory embout what was going wrong: increased traffic. Perhaps Consul was Long parce que our system reached a tipping position, and the servers je which Consul was running could no raser handle the load? This was our deuxième attempt at diagnosing the root prétexte of the incident.
Given this realization, the team again pivoted. Instead of looking at Consul from the perspective of the Roblox faveur that depend nous it, the team started looking at Consul internals expérience clues.
The ancêtre instruction suggested that the Consul cluster that Vault and many other bienfait depend on was unhealthy. Specifically, the Consul cluster metrics showed elevated write latency intuition the underlying KV tenture in which Consul banne data. The 50th percentile latency on these operations was typically under 300ms ravissant was now 2 seconds. Hardware native are not unusual at Roblox’s scale, and Consul can survive hardware failure.