Explanation:The primary key is used for partitioning, and the combination of the primary and secondary keys is used for sorting. 8. Which of the following class provides a subset of features provided by the Unix/GNU Sort ?
A. KeyFieldBased
B. KeyFieldComparator
C. KeyFieldBasedComparator
D. All of the mentioned
Answer:A
Explanation:The primary key is used for partitioning, and the combination of the primary and secondary keys is used for sorting. 8. Which of the following class provides a subset of features provided by the Unix/GNU Sort ?
A. KeyFieldBased B. KeyFieldComparator C. KeyFieldBasedComparator D. All of the mentioned
Explanation:Hadoop has a library class, KeyFieldBasedComparator, that is useful for many applications. 9. Which of the following class is provided by Aggregate package ?