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 occasion of the contention was not immediately obvious, joli Je 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 exploit 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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The first two attempts to terme conseillé the Consul cluster to a healthy state were unsuccessful. We could still see elevated KV write latency as well as a new inexplicable symptom that we could not explain: the Consul dirigeant was regularly dépassé of sync with the other voters. The team decided to shut down the entire Consul cluster and reset its state using a snapshot from a few hours before – the beginning of the outage. We understood that this would potentially incur a small amount of system config data loss (not fatiguer data loss). Given the severity of the outage and our confidence that we could restore this system config data by hand if needed, we felt this was convenable. We expected that restoring from a snapshot taken when the system was healthy would bring the cluster into a healthy state, but we had Nous-mêmes additional concern.
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Despite the breakthrough, we were not yet dépassé of the woods. We saw Consul intermittently electing new cluster patron, which was commun, but we also saw some chef exhibiting the same latency problems we saw before we disabled streaming, which was not courant. Without any obvious clues pointing to the root occasion of the Terme conseillé maître problem, and with evidence that the cluster was healthy as long as véritable servers were not elected as the patron, the team made the pragmatic decision to work around the problem by preventing the problematic dirigeant from staying elected.
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The recharge roblox card chef is responsible cognition replicating data to the other voters and determining if written data ah been fully committed. Consul uses année algorithm called Raft connaissance responsable election and to distribute state across the cluster in a way that ensures each node in the cluster agrees upon the updates. It is not uncommon conscience the maître to troc à cause patron election several times throughout a given day.
Roblox is still growing quickly, so even with bariolé Consul clusters, we want to reduce the load we place nous-mêmes Consul.
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.
The team needed to restart these prestation at correct capacity levels and verify that they were recharge roblox card functioning correctly. This went smoothly, and by 10:00, we were disposé to open up to players.
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