Java – why is map conversion so narrow?

I know the difference between narrow transform and wide transform of RDD My question is which parameters can prove that map and flatmap are narrow? Why are these changes not widespread? Any suggestions on RDD learning materials are appreciated

Solution

Here is one explanation

Another way to think of it is this Any row of the child RDD depends only on row 1 of the parent RDD Since each child row can point to the 1 parent row it depends on, there is a narrow dependency