Hi, Hadoopers, I got a question about shuffle/sort/merge phrase related.. My understanding is that shuffle is used to transfer the mapper output(key/value pairs) from mapper node to reducer node, and merge phrase is used to merge all the mapper output from all mapper nodes, and sort phrase is used to sort the key/value pair by key, Then my question, whose responsibility is it that brings each key with all its values together (The reducer's input is a key and an iterative values).
Thanks.
