replSetMaintenance

Definition

replSetMaintenance

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

Syntax

The command has the following syntax:

db.runCommand(
   {
     replSetMaintenance: <boolean>
   }
)

Behavior

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.