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  1. Documentation
  2. DOCS-11504

Misguided advice to deploy an odd number of members or votes

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Works as Designed
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: manual
    • Labels:
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    • # Replies:
      3
    • Last comment by Customer:
      true

      Description

      Our docs give the wrong advice that you should have an odd number of voting members in a replica set: https://docs.mongodb.com/manual/core/replica-set-architectures/#deploy-an-odd-number-of-members

      There is nothing in the replication protocol or the election algorithm that requires an odd number of voters. Many customers however think that there is such a requirement, and the passage at the above link may reinforce that misunderstanding.

      As the page explains one section down, an even number of members does not buy you any additional fault tolerance compared to the next lower odd number, which is why an odd number of members makes sense from an economical standpoint, but there is no technical requirement for this. I suggest removing the first paragraph at the above link entirely, and giving the section a different heading.

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              • Created:
                Updated:
                Resolved:
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                2 years, 2 weeks ago
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