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Hortonworks-Certified-Apache-Hadoop-2.0-Developer(Pig and Hive Developer) Sample Questions:

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

2. Which two of the following statements are true about Pig's approach toward data? Choose 2 answers

A) Accepts tab-delimited text data only
B) Accepts only data that is defined by metadata tables stored in a database
C) Accepts data whether it has metadata or not
D) Accepts any data: structured or unstructured
E) Accepts only data that has a key/value pair structure

3. Assuming default settings, which best describes the order of data provided to a reducer's reduce method:

A) Both the keys and values passed to a reducer always appear in sorted order.
B) The keys given to a reducer aren't in a predictable order, but the values associated with those keys
always are.
C) Neither keys nor values are in any predictable order.
D) The keys given to a reducer are in sorted order but the values associated with each key are in no
predictable order

4. Which one of the following statements describes the relationship between the NodeManager and the
ApplicationMaster?

A) The NodeManager requests resources from the ApplicationMaster
B) The ApplicationMaster starts the NodeManager outside of a Container
C) The ApplicationMaster starts the NodeManager in a Container
D) The NodeManager creates an instance of the ApplicationMaster

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

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

Solutions: