Hadoop Pig映射或Reduce查询

我有以下数据样本：

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

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非常感谢

是的，当您启动作业时，您将看到一个字符串

 org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher - detailed locations: M: Alias1[73,14] C: Alias2[20, 9] R: Alias3[90, 78]

M代表映射器，C代表组合器，R代表减速机。但在一般情况下，您的查询可能同时在mapper和reducer上运行

Elapsed: 35sec  
Diagnostics: 
 Average Map Time: 12sec  
 Average Shuffle Time: 10sec  
 Average Merge Time: 0sec  
 Average Reduce Time: 2sec 

 org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher - detailed locations: M: Alias1[73,14] C: Alias2[20, 9] R: Alias3[90, 78]