presto-main/src/main/java/io/prestosql/execution/TaskManagerConfig.java/TaskManagerConfig/setInitialSplitsPerNode
class TaskManagerConfig:    @Config("task.initial-splits-per-node")
    public TaskManagerConfig setInitialSplitsPerNode(int initialSplitsPerNode)
    {
        this.initialSplitsPerNode = initialSplitsPerNode;
        return this;
    }