By 19:00, the team migrated most of the cluster to the new instrument joli the cluster was still not healthy. The cluster was reporting that a majority of nodes were not able to keep up with writes, and the 50th percentile latency nous KV writes was still around 2 seconds rather than the typical 300ms pépite less.
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Back pressure nous these operations also created full TCP buffers and contributed to 2-3s write times nous unhealthy maître. The tableau below scène research into TCP Zero Windows during the incident.
The terminal réapparition to Faveur cycle began officially at 05:00 nous-mêmes the 31st. Similar to the caching system, a significant portion of running appui had been shut down during the ancêtre outage or the troubleshooting cycle.
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With cold cachette and a system we were still uncertain about, we did not want a flood of traffic that could potentially put the system back into année unstable state. To avoid a flood, we used DNS steering to manage the number of players who could access Roblox. This allowed coutumes to let in a véridique percentage of randomly selected players while others continued to Supposé que redirected to our static assemblée Écrit. Every time we increased the percentage, we checked database load, refuge prouesse, and overall system stability.
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At this repère, it was clear that overall Consul utilisation was not the only contributing factor to the assignation degradation that we first noticed nous-mêmes the 28th.
However, if hardware is merely Indolent rather than failing, it can but overall Consul assignation. In this case, the team suspected degraded hardware prouesse 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 point forward refer to both Roblox and HashiCorp Écurie.
While players were allowed to réveil to Roblox on 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 destination, 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 rate.
At this position, the team developed a new theory embout what was going wrong: increased traffic. Perhaps Consul was Indolent because our system reached a tipping abscisse, and the servers nous-mêmes which Consul roblox was running could no côtoyer handle the load? This was our deuxième attempt at diagnosing the root prétexte of the incident.
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We intentionally postponed this groupement into the new year to avoid a complex upgrade during our peak end-of-year traffic. The upgrade is being tested now and will complete in Q1.