Iterating over values by Key

[gulyasm <mg...@gmail.com>]

I have K/V pairs where V is an Iterable (from previous groupBy). I use the
JAVA API. 
What I want is to iterate over the values by key, and on every element set
previousElementId attribute, that is the id of the previous element in the
sorted list. 
I try to do this with mapValues. I create an array from the Iterable, sort
the list there and iterate over the values, setting the attribute and saving
the reference for the next element. After that, return the array. 
Is this the best approach or I miss something?

Spark version: 1.4.1
Java version: 1.8

Thanks in advance. 
Mate



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