Pig Latin distinguishing Map or Reduce queries - hadoop

Question

I have the following data sample:
AGE,EDU,SEX,SALARY
67,10th,Male,<=50K
17,10th,Female,<=50K
40,Assoc-voc,Male,>50K
35,Assoc-voc,Male,<=50K
57,Assoc-voc,Male,<=50K
49,Assoc-voc,Male,>50K
42,Bachelors,Male,>50K
30,Bachelors,Male,>50K
23,Bachelors,Female,<=50K
==============================================
I created the following Pig Latin/hadoop script:
sensitive = LOAD '/mdsba' using PigStorage(',') as (AGE,EDU,SEX,SALARY);
*--Filtered the data by the salary
Data_filter1 = FILTER sensitive by (SALARY matches '<=50K');
Data_filter2 = FILTER sensitive by (SALARY matches '>50K');
--group both filters
B= foreach(group Data_filter1 by(AGE,EDU,SEX))
generate Data_filter1;
C= foreach(group Data_filter2 by(AGE,EDU,SEX))
generate Data_filter2;
Dump B ;
Dump C ;
=============================================================
Is there any way to determine whether the queries B,C, Data_filter1, or Data_filter2 run on Map or Reduce process. Since the following report is generated at the end of the job:
Elapsed: 35sec
Diagnostics:
Average Map Time: 12sec
Average Shuffle Time: 10sec
Average Merge Time: 0sec
Average Reduce Time: 2sec
With many thanks

Answer 1

Yes, when you are launching the job you'll see a string
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher - detailed locations: M: Alias1[73,14] C: Alias2[20, 9] R: Alias3[90, 78]
M stands for mapper, C for combiner, R for reducer. But in general case there is a possibility that your queries will run on both mapper and reducer