Iterate twice on values (MapReduce)

Question

I receive an iterator as argument and I would like to iterate on values twice.

public void reduce(Pair key, Iterator          


        

Answer 1

you can do that

MarkableIterator mitr = new MarkableIterator(values.iterator());
mitr.mark();
while (mitr.hasNext()) 
{
//do your work
}
mitr.reset();
while(mitr.hasNext()) 
{
//again do your work
}

1. Reference Link 2

2. Reference Link 2