[infinispan-dev] Map/Reduce enhancements with ISPN-2037

Guys, I believe I finished ISPN-2037 that Sanne needed for his queries. However, adding ISPN-2037 commit to current master involves injection of CacheLoaderManager into MapReduceCommand. That solution is pretty ugly and we are switching soon to a new map/reduce implementation anyway. Going in that direction is a waste IMHO. I already talked to Mircea and Manik about using a Manager-like service much like RecoveryManager or EvictionManager to manage incoming map/reduce invocations on Infinispan node. MapReduceManager is per cache component. It turned out to be an excellent fit! I converted our current solution where map is done in distributed fashion while reduction is done on master task node to this new approach. I made it a default just as it is now. Then I added all the previous work on new map/reduce reviewed by Dan and Galder and adjusted it to this new Manager paradigm. Users can choose if they want reduce part done in distributed approach simply by using a different MapReduceTask constructor. And finally I added ISPN-2037 as a separate commit on top of this rework. This proposal is at https://github.com/vblagoje/infinispan/commits/t_mr_final I would like to hear your thoughts and comments before proceeding forward. Regards, Vladimir