presto-main/src/main/java/io/prestosql/execution/TaskManagerConfig.java/TaskManagerConfig/setMaxDriversPerTask
class TaskManagerConfig:    @Config("task.max-drivers-per-task")
    @ConfigDescription("Maximum number of drivers a task can run")
    public TaskManagerConfig setMaxDriversPerTask(int maxDriversPerTask)
    {
        this.maxDriversPerTask = maxDriversPerTask;
        return this;
    }