Story cover for Why we need to use Odd number of nodes in MongoDB ReplicaSet by kovidacademy
Why we need to use Odd number of nodes in MongoDB ReplicaSet
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  • WpView
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  • WpVote
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    Time <5 mins
Ongoing, First published Oct 05, 2017
In MongoDB  ReplicaSet, the voting is done by a majority of voting members.

Imagine a Replica Set with three (voting) members. Let's say that Node A is primary, and nodes B+C are secondaries. Node A goes down, so nodes B+C go to election. They still do form a majority (two out of three). The election is first decided by priority. If both Nodes B & C have the same priority, then the one who is most up to date in respect to the failed primary (oplog) wins. Let's say it's Node B.
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The Secenario Game

9 parts Complete

Our past is straight, like a river flowing from upstream. Whenever there is a choice, the river splits into two, signifying the possible decisions. Just because you chose one, does it mean that the other path does not exist? Is there ever a 'correct' answer? This is what I like to call a 'Scenario Game', where everyone's answer would be different. I would love to read your comments, who you would choose and why you chose them, so don't be afraid to abuse the comment button down below. If you enjoyed, please feel free to give me some feedback. I might do more if there is enough demand. Enjoy. "You always have a choice, no matter what. Can you choose the correct one?"