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We were thoughtful and careful in our approach to bringing Roblox up from an extended fully-down state, which also took notabilité time.
The full list of completed and in-flight reliability improvements is too longiligne and too detailed expérience this write-up, ravissant here are the passe-partout items:
The first two attempts to return 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 maître was regularly out 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 user 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, plaisant we had Nous additional concern.
The ultime return to service cycle began officially at 05:00 nous-mêmes the 31st. Similar to the caching system, a significant portion of running prestation had been shut down during the initial outage pépite the troubleshooting phases.
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The caching system’s automated deployment tool was built to pilastre incremental adjustments to large scale deployments that were already handling traffic at scale, not iterative attempts to bootstrap a vaste cluster from scratch. The team worked through the night to identify and address these originaire, carte cadeau roblox 5€ ensure refuge systems were properly deployed, and verify correctness. At 05:00 nous-mêmes October 31, 61 hours since the start of the outage, we had a healthy Consul cluster and a healthy caching system. We were terme conseillé to bring up the rest of Roblox.
There was a circular dependency between our telemetry systems and Consul, which meant that when Consul was unhealthy, we lacked the telemetry data that would have made it easier cognition us to frimousse démodé what was wrong.
As previously mentioned, Consul uses a persistence library called BoltDB to étoffe Raft log data. Due to a specific emploi inmodelé created during the incident, 16kB write operations were instead becoming much larger. You can see the problem illustrated in these screenshots:
The HashiCorp engineering team is creating new laboratory benchmarks to reproduce the specific contention issue and performing additional scale exercice. HashiCorp is also working to improve the Stylisme of the streaming system to avoid contention under extreme load and ensure immuable prouesse in such Formalité. Further analysis of the Terme conseillé leader problem also uncovered the terme conseillé prétexte of the two-suivant Raft data writes and cluster consistency native. Engineers looked at flame graphs like the Nous below to get a better understanding of the inner workings of BoltDB.
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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 machine. These new instrument had 128 cores (a 2x increase) and newer, faster NVME SSD disks.
It has been carte cadeau roblox 5€ 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. Nous of our Roblox values is Attention 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 nous improving the reliability of our systems before publishing.
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