Hi all, I had a small doubt regarding the reduce module. What I understand is that after the shuffle / sort phase , all the records with the same key value goes into a reduce function. If thats the case, what is the attribute of the Writable key which ensures that all the keys go to the same reduce ?
I am working on a reduce side Join where I need to tag all the keys with a bit which might vary but still want all those records to go into same reduce. In Hadoop the Definitive Guide, pg. 235 they are using TextPair for the key. But I dont understand how the keys with different tag information goes into the same reduce. Matthew
