MongoDB Internal Architecture | The Backend Engineering Show
The Backend Engineering Show with Hussein Nasser
00:00
M Map
The core of discord moved from Mongo DB because their indexes were so large, they couldn't even fit in memory. If your index doesn't fit in memory, that means as you traverse the operating system will swap files and swap things to disk if it's not used. The entire file is now scrambled, right? Because the documents are based on offset. That was a problem. Plus another problem with the M map is the locking model, right? There's a responsibility of the storage engine really locking,. How do you prevent two people from editing the same document at the same time? You shouldn't really do that, right?
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