presto-main/src/main/java/io/prestosql/execution/TaskManagerConfig.java/TaskManagerConfig/setMinDriversPerTask
class TaskManagerConfig:    @Config("task.min-drivers-per-task")
    @ConfigDescription("Minimum number of drivers guaranteed to run per task given there is sufficient work to do")
    public TaskManagerConfig setMinDriversPerTask(int minDriversPerTask)
    {
        this.minDriversPerTask = minDriversPerTask;
        return this;
    }