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Hortonworks Hadoop 2.0 Certification exam for Pig and Hive Developer Sample Questions:

1. How are keys and values presented and passed to the reducers during a standard sort and shuffle phase of MapReduce?

A) Keys are presented to reducer in sorted order; values for a given key are sorted in ascending order.
B) Keys are presented to a reducer in random order; values for a given key are not sorted.
C) Keys are presented to a reducer in random order; values for a given key are sorted in ascending order.
D) Keys are presented to reducer in sorted order; values for a given key are not sorted.

2. What does the following WebHDFS command do?
Curl -1 -L "http://host:port/webhdfs/v1/foo/bar?op=OPEN"

A) Make a directory /foo/bar
B) List a directory /foo
C) Read a file /foo/bar
D) Delete a directory /foo/bar

3. In a MapReduce job, the reducer receives all values associated with same key. Which statement best describes the ordering of these values?

A) The values are in sorted order.
B) The values are arbitrarily ordered, and the ordering may vary from run to run of the same MapReduce job.
C) The values are arbitrary ordered, but multiple runs of the same MapReduce job will always have the same ordering.
D) Since the values come from mapper outputs, the reducers will receive contiguous sections of sorted values.

4. Which one of the following statements is true about a Hive-managed table?

A) Hive dynamically defines the schema of the table based on the format of the underlying data.
B) Records can only be added to the table using the Hive INSERT command.
C) Hive dynamically defines the schema of the table based on the FROM clause of a SELECT query.
D) When the table is dropped, the underlying folder in HDFS is deleted.

5. MapReduce v2 (MRv2/YARN) is designed to address which two issues?

A) HDFS latency.
B) Standardize on a single MapReduce API.
C) Single point of failure in the NameNode.
D) Ability to run frameworks other than MapReduce, such as MPI.
E) Reduce complexity of the MapReduce APIs.
F) Resource pressure on the JobTracker.

Solutions: