Starts the scheduler: a front process campaigns for the leader's lease and
runs per-process jobs; a request worker runs per-process jobs only.
Idempotent.
Parameters
Optionalrole: string
'front' or 'per-process'
Returns boolean
true when started by this call, false when already started
Starts the scheduler: a front process campaigns for the leader's lease and runs per-process jobs; a request worker runs per-process jobs only. Idempotent.