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  1. Documentation
  2. DOCS-13029

Note that arbiters will always return the previous version for FCV by design

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    • Type: Task
    • Status: Open
    • Priority: Minor - P4
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: manual, Server
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      Description

      Description

      For https://docs.mongodb.com/manual/reference/command/setFeatureCompatibilityVersion/#dbcmd.setFeatureCompatibilityVersion

       In SERVER-37049, Tess wrote:

      Arbiters always have the downgrade value of FCV, regardless of the FCV of the replica set. So if the arbiter has binary version 3.6, it will always have FCV=3.4. They never learn the FCV, since they do not replicate the admin.system.version collection. Arbiters' behavior is not allowed to depend on FCV for this reason.

      We should add a small section titled "Arbiters" to explain that this is expected behaviour since it can unexpected.

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              Assignee:
              kay.kim Kay Kim (Inactive)
              Reporter:
              nicholas.cottrell Nic Cottrell
              Participants:
              Last commenter:
              Stennie Steneker
              External Reviewer:
              Nic Cottrell
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                Created:
                Updated:
                Days since reply:
                1 year, 1 week, 4 days ago
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