Github user squito commented on the pull request:
https://github.com/apache/spark/pull/3913#issuecomment-93486450
I think this is a good change. Yes, you could cache an RDD and see its
size, but think about what a pain that actually is if you wanted to do it
programmatically. You'd need to register a spark listener, wait to get the
appropriate events and look at the sizes.
If it was easy to do this programmatically via an RDD, then I'd say this
change isn't necessary. Eg., if you could do something like
```
val (_, meta) = sc.parallelize(oneObject).cache().count()
meta.getPartitionSizes
```
Then we wouldn't need to expose this. But that's an even bigger api
change, and one that I would be far more nervous about (the code above is
definitely not a viable alternative, lots of reasons it doesn't make sense).
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