##########################################	The ReducerWorker module is the worker to do the reducerTask.#	It gets its partitions of files from each mapper,and merge them outside the memory.#	Then reducerworker will run the user reduce function, save the result to local and upload the result to DFS.##	@author Yang Fan(fyabc) #	@author Guanji Gao(ggj)######################################### ReducerWorker : module {	PATH : con "/appl/MR/mapreduce/reducerworker.dis"; 	init : fn();		run : fn(mapperFileAddrs : list of string , reducerTask : ref MRUtil->ReducerTask) : (int, string);};