Hello everyone ! I have a problem with MapReduce [:(] like that : I have 4 file input with 3 fields : teacherId, classId, numberOfStudent (numberOfStudent is ordered by desc for each teach) Output is top 30 classId that numberOfStudent is max for each teacher. My approach is MapReduce like Wordcount example. But I don't know how to determine key for map function. I run Wordcount example, understand its code but I have no experience at programming MapReduce.
Can anyone help me to resolve this problem ? Thanks so much ! -- Lạc Trung 20083535
