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  1. Core Server
  2. SERVER-39052

Reading and writing FCV is asymmetric in sharded clusters

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    • Sharding EMEA
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    Description

      https://docs.mongodb.com/manual/reference/command/setFeatureCompatibilityVersion/ states that setting FCV is done on a mongos, but reading the FCV back on a mongos is not allowed.

      Writing:

      > For a sharded cluster, run the command on a mongos instance.

      Reading:

      > The operation is undefined on the mongos instances. For a sharded cluster that has access control enabled, to run the command against a member of the shard replica set, you must connect to the member as a shard local user.

      Why is mongos able to write FCV but not read it back?

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              backlog-server-sharding-emea Backlog - Sharding EMEA
              oleg.pudeyev@mongodb.com Oleg Pudeyev (Inactive)
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                Updated: