Mutual Friends MapReduce Application
Finding mutual friends is a compelling MapReduce App and has a nice write up on the web.
Code To Implement
The only method you will need to alter is the map method. In this method, you will need to map every combination of the account holder to his/her friends. In order to do this, create ordered pairs of the given account’s ID and the IDs of the account holder’s friends. You must then feed each individual ordered pair into the keyValuePairConsumer along with the full set of the account holder’s friends.
Hint: check out the methods in the Account class for help.
MutualFriendIds for clues on what you need to do.
Testing Your Solution