Why we need to use Odd number of nodes in MongoDB ReplicaSet

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Reads 363
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Parts 1
Time <5 mins

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.All Rights Reserved

mongodb mongodbreplicaset oddnumber replicaset

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Odd number of nodes in MongoDB ReplicaSet
Thu, Oct 5, 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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