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The replSetMaintenance admin command enables or disables the maintenance mode for a secondary member of a replica set.

The command has the following prototype form:

{ replSetMaintenance: <boolean> }

Consider the following behavior when running the replSetMaintenance command:

  • You cannot run the command on the Primary.
  • You must run the command against the admin database.
  • When enabled replSetMaintenance: true, the member enters the RECOVERING state. While the secondary is RECOVERING:

    • The member is not accessible for read operations.
    • The member continues to sync its oplog from the Primary.
  • When a node receives a replSetMaintenance: true request, it adds a maintenance mode task to a queue of tasks. If the queue of tasks was empty and now is not, the node will transition to RECOVERING state and begin to reject read requests. When a node receives a replSetMaintenance: false request, it removes a maintenance mode task from the queue (even if that task was initiated by a different client). If the request empties the maintenance mode task queue, the node will return to SECONDARY state.
  • If you want to prevent a node from servicing reads, consider using Hidden Replica Set Members instead.

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