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

1. In a large MapReduce job with m mappers and n reducers, how many distinct copy operations will there
be in the sort/shuffle phase?

A) mXn (i.e., m multiplied by n)
B) mn (i.e., m to the power of n)
C) m+n (i.e., m plus n)
D) m
E) n

2. Which HDFS command uploads a local file X into an existing HDFS directory Y?

A) hadoop fs -get X Y
B) hadoop fs -localPut X Y
C) hadoop fs-put X Y
D) hadoop scp X Y

3. Which one of the following Hive commands uses an HCatalog table named x?

A) SELECT * FROM x;
B) SELECT x.-FROM org.apache.hcatalog.hive.HCatLoader('x');
C) Hive commands cannot reference an HCatalog table
D) SELECT * FROM org.apache.hcatalog.hive.HCatLoader('x');

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

5. Workflows expressed in Oozie can contain:

A) Sequences of MapReduce and Pig. These sequences can be combined with other actions including
forks, decision points, and path joins.
B) Sequences of MapReduce and Pig jobs. These are limited to linear sequences of actions with
exception handlers but no forks.
C) Sequences of MapReduce job only; on Pig on Hive tasks or jobs. These MapReduce sequences can
be combined with forks and path joins.
D) Iterntive repetition of MapReduce jobs until a desired answer or state is reached.

Solutions: