Changed in version 4.2.
Starts the balancer in a sharded cluster. Starting in MongoDB 4.2,
sh.startBalancer()also enables auto-splitting for the sharded cluster.
The method can take the following options:ParameterTypeDescription
Optional. Time limit for enabling the balancer.
Defaults to 60000 milliseconds.
intervalintegerOptional. The frequency (in milliseconds) at which to check if a balancing round has started.
In earlier versions, the method waited for the balancing to start.