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NO.1 Which one of the following classes would a Pig command use to store data in a table defined in
HCatalog?
A. No special class is needed for a Pig script to store data in an HCatalog table
B. org.apache.hcatalog.pig.HCatOutputFormat
C. org.apache.hcatalog.pig.HCatStorer
D. Pig scripts cannot use an HCatalog table
Answer: C

HDPCD exam   

NO.2 For each input key-value pair, mappers can emit:
A. As many intermediate key-value pairs as designed. There are no restrictions on the types of those
key-value pairs (i.e., they can be heterogeneous).
B. One intermediate key-value pair, of a different type.
C. As many intermediate key-value pairs as designed, as long as all the keys have the same types and
all the values have the same type.
D. As many intermediate key-value pairs as designed, but they cannot be of the same type as the
input key-value pair.
E. One intermediate key-value pair, but of the same type.
Answer: C

HDPCD dumps   
Explanation:
Mapper maps input key/value pairs to a set of intermediate key/value pairs.
Maps are the individual tasks that transform input records into intermediate records. The
transformed intermediate records do not need to be of the same type as the input records. A given
input pair may map to zero or many output pairs.
Reference: Hadoop Map-Reduce Tutorial

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