Why we need to use Odd number of nodes in MongoDB ReplicaSet
kovidacademy
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  • Reads 363
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  • Parts 1
  • Time <5 mins
kovidacademy
Ongoing, First published Oct 05, 2017
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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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Wendizzy's Writer Room cover

Wendizzy's Writer Room

2 parts Ongoing

In this book, you'll get a behind the scenes look at how your favorite characters were born, my creative process, and the dirty details never before revealed. Tex's Camp Q&A: Come sit by the fire and ask me whatever you'd like. We can roast marshmallows, tell scary stories, and hang out in the comments like a big, happy family. Gator's Backstage Pass: A place full of secrets. Learn the-sometimes embarrassing-details on how my wildest scenes came to life, facts about the characters, the process, and myself.

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