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最新的 CCDH CCD-410 免費考試真題:

1. 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

2. MapReduce v2 (MRv2/YARN) splits which major functions of the JobTracker into separate daemons? Select two.

A) Job scheduling/monitoring
B) Launching tasks
C) Managing tasks
D) Job coordination between the ResourceManager and NodeManager
E) Heath states checks (heartbeats)
F) MapReduce metric reporting
G) Managing file system metadata
H) Resource management

3. Indentify which best defines a SequenceFile?

A) A SequenceFile contains a binary encoding of an arbitrary number key-value pairs. Each key must be the same type. Each value must be the same type.
B) A SequenceFile contains a binary encoding of an arbitrary number of heterogeneous Writable objects
C) A SequenceFile contains a binary encoding of an arbitrary number of WritableComparable objects, in sorted order.
D) A SequenceFile contains a binary encoding of an arbitrary number of homogeneous Writable objects

4. When is the earliest point at which the reduce method of a given Reducer can be called?

A) It depends on the InputFormat used for the job.
B) As soon as at least one mapper has finished processing its input split.
C) Not until all mappers have finished processing all records.
D) As soon as a mapper has emitted at least one record.

5. What is a SequenceFile?

A) A SequenceFile contains a binary encoding of an arbitrary number of heterogeneous writable objects.
B) A SequenceFile contains a binary encoding of an arbitrary number of homogeneous writable objects.
C) A SequenceFile contains a binary encoding of an arbitrary number of WritableComparable objects, in sorted order.
D) A SequenceFile contains a binary encoding of an arbitrary number key-value pairs. Each key must be the same type. Each value must be same type.

問題與答案：