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modifying existing wordcount example
  In the wordcount example:
Lets say I run the above example and save the the output.
But lets say that I have now a new input file. What I want to do is..
basically again do the wordcount but basically modifying the previous
For example..
sample_input1.txt  //foo bar foo bar bar bar
After first run:
1) foo 2
2) bar 4

Save it in output1.txt

Now sample_input2.txt //bar hello world
Now the result I am looking for is:
1)foo 2
2)bar 5
3) hello 1
4) world 1

How do i achieve this in map reduce?