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HDPCD Test Guide Total Q&A: 110 Questions and Answers
Last Update: 2017-03-18
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NO.1 For each intermediate key, each reducer task can emit:
A. One final key-value pair per value associated with the key; no restrictions on the type.
B. As many final key-value pairs as desired. There are no restrictions on the types of those key-value
pairs (i.e., they can be heterogeneous).
C. As many final key-value pairs as desired, as long as all the keys have the same type and all the
values have the same type.
D. One final key-value pair per key; no restrictions on the type.
E. As many final key-value pairs as desired, but they must have the same type as the intermediate
key-value pairs.
Answer: C
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Reference: Hadoop Map-Reduce Tutorial; Yahoo! Hadoop Tutorial, Module 4: MapReduce
NO.2 For each input key-value pair, mappers can emit:
A. One intermediate key-value pair, of a different type.
B. 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.
C. One intermediate key-value pair, but of the same type.
D. 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).
E. As many intermediate key-value pairs as designed, but they cannot be of the same type as the
input key-value pair.
Answer: B
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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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