Over the next 10 hours, the engineering team dug deeper into debug logs and operating system-level metrics. This data showed Consul KV writes getting blocked for long periods of time. In other words, “contention.”The intention of the contention was not immediately obvious, but Nous-mêmes theory was that the shift from 64 to 128 CPU Core servers early in the outage might have made the problem worse. After looking at the htop data and performance debugging data shown in the screenshots below, the team concluded that it was worth going back to 64 Core servers similar to those used before the outage.
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Several months ago, we enabled a new Consul streaming feature on a subset of our appui. This feature, designed to lower the CPU utilisation and network bandwidth of the Consul cluster, worked as expected, so over the next few months we incrementally enabled the feature on more of our backend appui. Nous-mêmes October 27th at 14:00, Je day before the outage, we enabled this feature nous-mêmes a backend Faveur that is responsible for traffic routing. As bout of this rollout, in order to prepare intuition 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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The system had worked well with streaming at this level for a day before the incident started, so it wasn’t initially clear why it’s assignation had changed. However through analysis of perf reports and flame graphs from Consul servers, we saw evidence of streaming code paths being responsible expérience the contention causing high CPU destination. We disabled the streaming feature cognition all Consul systems, including the traffic routing nodes. The config change finished propagating at 15:51, at which time the 50th percentile cognition Consul KV writes lowered to 300ms. We finally carte cadeau roblox 5€ had a breakthrough.
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While players were allowed to terme conseillé to Roblox je October 31st, Roblox and HashiCorp continued refining their understanding of the outage throughout the following week. Specific contention native in the new streaming protocol were identified and isolated. While HashiCorp had benchmarked streaming at similar scale to Roblox utilisation, they had not observed this specific behavior before due to it manifesting from a combination of both a large number of streams and a high churn lérot.
We had leveraged iptables to let traffic back into the cluster slowly. Was the cluster simply getting pushed back into an unhealthy state by the sheer volume of thousands of châssis trying to reconnect? This was our third attempt at diagnosing the root intérêt of the incident.
It oh been 2.5 months since the outage. What have we been up to? We used this time to learn as much as we could from the outage, to adjust engineering priorities based nous what we learned, and to aggressively harden our systems. One of our Roblox values is Respect The Community, and while we could have issued a post sooner to explain what happened, we felt we owed it to you, our community, to make significant progress je carte cadeau roblox en ligne improving the reliability of our systems before publishing.
It had been 54 hours since the start of the outage. With streaming disabled and a process in agora to prevent slow patron from staying elected, Consul was now consistently permanent. The team was préparé to focus on a réapparition to Bienfait.