All,
I have three mappers, followed by a reducer. I executed the map reduce
successfully. The reported output shows that number of mappers executed is
1 and number of reducers is also 1. Though number of reducers are correct,
won't we be getting number of mappers as 3 , since I have three mapper
classes connected by ChainMapper?
O/P given below (snippet) :-
Job Counters
Launched map tasks=1
Launched reduce tasks=1
Data-local map tasks=1
Total time spent by all maps in occupied slots (ms)=8853
Total time spent by all reduces in occupied slots (ms)=9900
Total time spent by all map tasks (ms)=8853
Total time spent by all reduce tasks (ms)=9900
Total vcore-seconds taken by all map tasks=8853
Total vcore-seconds taken by all reduce tasks=9900
Total megabyte-seconds taken by all map tasks=9065472
Total megabyte-seconds taken by all reduce tasks=10137600
What I guess is, since the output is passing through Context, the internal
connected mappers are not caught by job counter, am I correct ?
Best, Ravion
