Dear all, I have one single input file, which contains, on every line, some hydrological calibration models (data). Each line of the file should be processed and then the output from every line written to another single output file.
I understood that hadoop spawns mapper tasks with the same number as how many input files there are (meaning, in my case, a single mapper would be generated). However, I want that a mapper to be dealing with only a single line from my input file (nr. of mapper tasks = number of lines in my file). What is the best way to obtain such behavior? How should I specify this to Hadoop? Any suggestions are more than welcome. Thank you, Lehel.
