Changed the process ordering: the conversion from a document to a countMinSketch is now in the mapper and the reducer combines the different lines of the final document frequency object.
Added a method to get a HashMap object from a MatrixMarket string (almost the same as from a file).
Reinitialize the docFrequency array for each new document.
Needed to check docFrequency, accidentally put keyFrequency.
Extract reducer input string and store in intermediary string (may not be needed, but add clarity).
Fixed MatrixMarket read/write compatibility with comma separation, and saving sparse array size in output strings.
Made the document frequency sketch size variables.
Changed the MapReduce ports on localhost (trying to get pseudo-distributed working).