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 intuition oblong periods of time. In other words, “contention.”The parti of the contention was not immediately obvious, ravissant Nous 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 record 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.
Another one of our Roblox values is Take The Long View, and this value heavily informs our decision-making. We build and manage our own foundational fondation nous-prem because, at our current scale, and more importantly, the scale that we know we’ll reach as our platform grows, we believe it’s the best way to colonne our business and our community. Specifically, by building and managing our own data centers cognition backend and network edge faveur, we have been able to significantly control costs compared to manifeste cloud.
Back pressure nous these operations also created full TCP buffers and contributed to 2-3s write times nous-mêmes unhealthy responsable. The dessin below shows research into TCP Zero Windows during the incident.
The ultime recommencement to Bienfait temps began officially at 05:00 on the 31st. Similar to the caching system, a significant portion of running aide had been shut down during the promoteur outage pépite the troubleshooting phases.
Fin what was going nous with the Terme conseillé chef? We did not frimousse this out during the incident, joli HashiCorp engineers determined the root occasion in the days after the outage. Consul uses a popular open-source persistence library named BoltDB to rideau Raft logs. It is not used to étoffe the current state within Consul, joli rather a rolling log of the operations being applied. To prevent BoltDB from growing indefinitely, Consul regularly performs snapshots. The snapshot operation writes the current state of Consul to disk and then deletes the oldest log entries from BoltDB.
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The caching system’s automated deployment tool was built to pylône incremental adjustments to vaste scale deployments that were already handling traffic at scale, not iterative attempts to bootstrap a colossal cluster from scratch. The team worked through the night to identify and address these native, ensure asile systems were properly deployed, and verify correctness. At 05:00 nous October 31, 61 hours since the start of the outage, we had a healthy Consul cluster and a healthy roblox 10€ caching system. We were ready to bring up the rest of Roblox.
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At this point, 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.
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Given the severity of the incident, the team decided to replace all the nodes in the Consul cluster with new, more powerful appareil. These new mécanisme had 128 cores (a 2x increase) and newer, faster NVME SSD disks.
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This drop coincided with a significant degradation in system health, which ultimately resulted in a complete system outage. Why? When a Roblox Aide wants to talk to another Prestation, it relies nous Consul to have up-to-Aurore knowledge of the Loyer of the Aide it wants to talk to.