System Design - Part 12 | Design a Unique ID Generator | 4 Methods

[@charliioo]

Amazing video thank you !!

[@AmitKumar-cp1oz]

thanks

[@nageshnimmala7366]

Hi @nikoo28 thanks for the info , i have a question can you please clarify this let's say if i want to design a systen like which generate unique id's in multi node cluster (mongo) in this case if parllel requests comes to server i think there will be one master which accept updates , writes so here how the system will handle parllel requests comes to same document either by using atomicity opeartions , at this time mongo db will lock the document or how it handles mongo db provides counter collection as per docs how this handle concurrency

[@nikoo28]

In MongoDB, unique ID generation in a multi-node cluster is handled through atomic operations like `findAndModify()` with document-level locking. When parallel requests occur, MongoDB ensures concurrency by:
- Locking the specific document during write operations
- Using atomic increments on a counter collection
- Preventing race conditions through `$inc` operator
- Supporting concurrent reads while a document is being updated
The counter collection provides a thread-safe mechanism to generate sequential, unique IDs across distributed nodes. This mechanism guarantee that even with multiple simultaneous requests, each ID remains unique and consistently generated.​​​​​​​​​​​​​​​​

[@nageshnimmala7366]

@nikoo28 thank you for clarification

[@Wala-fd2kt]

i hope if ure a muslim