1. When I run more than 1 task from the same program, the output file of all the
tasks is same. The framework does not allows the 2 map reduce task to have the
same output file as task 1.
That's correct. Your instructor probably intends for you to find a way
to merge the files. There's a lot of ways you might do this, both
through a Map/Reduce job or just single-threaded on the child machine.
The documentation for the FileSystem class and/or SequenceFile.Reader
and SequenceFile.Writer may help. Also remember that you can control a
lot of how a job runs by changing settings in the JobConf.
3. When the 2 map reduce tasks writes its output to file "output", wont the
previous content of this file get over written
Actually, this will produce an exception since the file already exists.
