MongoDB Whiteboard: Write Concerns 101

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A high level overview of write concerns in MongoDB.

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I have a question for you. If I have a 3 nodes replica set running MongoDB v5 with default write concern of majority. What happen if we take a secondary node down for maintenance? Like rolling index build that take many hours. During this time, the replica set only has 2 nodes, what happen during this time with write to the db?

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