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A technical look into what happened behind the scenes during the longest outage in Roblox history. Sources:
https://blog.roblox.com/2022/01/roblox-return-to-service-10-28-10-31-2021/https://www.hashicorp.com/resources/how-we-used-the-hashistack-to-transform-the-world-of-roblox
https://roblox.fandom.com/wiki/2021_Roblox_outage/
https://roblox.fandom.com/wiki/Timeline_of_Roblox_history/2016#August_2016
https://news.ycombinator.com/item?id=30013919
https://raft.github.io/
http://www.lmdb.tech/media/20130329-devox-MDB.pdf http://www.lmdb.tech/doc/
https://db.cs.cmu.edu/mmap-cidr2022/https://www.youtube.com/watch?v=HDOipdFPbB4
Chapters: 0:00 Intro 0:33 HashiStack Explanation 4:47 Outage Investigation 8:20 Root Causes Found 11:30 Return to Service 12:19 Slow Leaders 15:56 Resolution Corrections: - At 9:44, the default unbuffered channel in Go does not hold any items and has a buffer size of 0. Sends to such a channel are blocked until another goroutine is ready to receive the value. The illustration in the video shows a **buffered channel of size 1** however the overall point still stands. Music Credits: - Firecracker by LEMMiNO (
https://www.youtube.com/watch?v=ulfoU2MziOc)- Impact Prelude by Kevin MacLeod - We're Finally Landing by Home
ffmpeg -i recorded.mp4 -vf "select='gt(scene,0.01)',showinfo" -vsync vfr recorded/frame_%06d.jpgsend a file through terminal qrcode. GitHub Gist: instantly share code, notes, and snippets.
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