3A) The job tracker do some typical functions.they are
1.take the jobs from clients.
2.jt communicate with name node to determine the location of data.
3.it locates the tasktracker nodes with nearest data.
4.it submits the work to chosen TT nodes nd monitors progress of each task by receiving heartbeat signals from TT.
10a)There can be several ways of doing this but most common ways are:-
1.By using counters.
2.The web interface provided by Hadoop framework.