Explanation:Hadoop has a library class, KeyFieldBasedComparator, that is useful for many applications. 9. Which of the following class is provided by Aggregate package ?
A. Map
B. Reducer
C. Reduce
D. None of the mentioned
Answer:A
Explanation:Hadoop has a library class, KeyFieldBasedComparator, that is useful for many applications. 9. Which of the following class is provided by Aggregate package ?
A. Map B. Reducer C. Reduce D. None of the mentioned
Explanation:Aggregate provides a special reducer class and a special combiner class, and a list of simple aggregators that perform aggregations such as “sum”, “max”, “min” and so on over a sequence of values. 10.Hadoop has a library class, org.apache.hadoop.mapred.lib.FieldSelectionMapReduce, that effectively allows you to process text data like the unix ______ utility.