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

1. You are developing a MapReduce job for sales reporting. The mapper will process input keys representing the year (IntWritable) and input values representing product indentifies (Text).
Indentify what determines the data types used by the Mapper for a given job.

A) The key and value types specified in the JobConf.setMapInputKeyClass and JobConf.setMapInputValuesClass methods
B) The InputFormat used by the job determines the mapper's input key and value types.
C) The mapper-specification.xml file submitted with the job determine the mapper's input key and value types.
D) The data types specified in HADOOP_MAP_DATATYPES environment variable

2. You have a directory named jobdata in HDFS that contains four files: _first.txt, second.txt, .third.txt and #data.txt. How many files will be processed by the FileInputFormat.setInputPaths () command when it's given a path object representing this directory?

A) None, the directory cannot be named jobdata
B) Three, the pound sign is an invalid character for HDFS file names
C) Four, all files will be processed
D) Two, file names with a leading period or underscore are ignored
E) One, no special characters can prefix the name of an input file

3. Your cluster's HDFS block size in 64MB. You have directory containing 100 plain text files, each of which is 100MB in size. The InputFormat for your job is TextInputFormat. Determine how many Mappers will run?

A) 640
B) 200
C) 100
D) 64

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

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

5. Table metadata in Hive is:

A) Stored along with the data in HDFS.
B) Stored in the Metastore.
C) Stored as metadata on the NameNode.
D) Stored in ZooKeeper.

Solutions: