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最新的 HCAHD Apache-Hadoop-Developer 免費考試真題:

1. What data does a Reducer reduce method process?

A) All data for a given value, regardless of which mapper(s) produced it.
B) All data for a given key, regardless of which mapper(s) produced it.
C) All the data in a single input file.
D) All data produced by a single mapper.

2. For each intermediate key, each reducer task can emit:

A) As many final key-value pairs as desired, but they must have the same type as the intermediate key-value pairs.
B) One final key-value pair per value associated with the key; no restrictions on the type.
C) One final key-value pair per key; no restrictions on the type.
D) 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).
E) 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.

3. Which project gives you a distributed, Scalable, data store that allows you random, realtime read/write access to hundreds of terabytes of data?

A) Hue
B) Pig
C) Flume
D) HBase
E) Oozie
F) Sqoop
G) Hive

4. You have written a Mapper which invokes the following five calls to the OutputColletor.collect method:
output.collect (new Text ("Apple"), new Text ("Red") ) ;
output.collect (new Text ("Banana"), new Text ("Yellow") ) ;
output.collect (new Text ("Apple"), new Text ("Yellow") ) ;
output.collect (new Text ("Cherry"), new Text ("Red") ) ;
output.collect (new Text ("Apple"), new Text ("Green") ) ;
How many times will the Reducer's reduce method be invoked?

A) 0
B) 1
C) 6
D) 3
E) 5

5. Which one of the following statements describes the relationship between the ResourceManager and the ApplicationMaster?

A) The ApplicationMaster requests resources from the ResourceManager
B) The ApplicationMaster starts an instance of the ResourceManager within each Container
C) The ResourceManager monitors and restarts any failed Containers of the ApplicationMaster
D) The ApplicationMaster starts a single instance of the ResourceManager

問題與答案：