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

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

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

2. Can you use MapReduce to perform a relational join on two large tables sharing a key? Assume that the two tables are formatted as comma-separated files in HDFS.

A) No, MapReduce cannot perform relational operations.
B) Yes.
C) No, but it can be done with either Pig or Hive.
D) Yes, so long as both tables fit into memory.
E) Yes, but only if one of the tables fits into memory

3. Given the following Hive command:

Which one of the following statements is true?

A) The files in the mydata folder do not move from their current location In HDFS
B) The files in the mydata folder are copied to a subfolder of /apps/hlve/warehouse
C) The files in the mydata folder are moved to a subfolder of /apps/hive/wa re house
D) The files in the mydata folder are copied into Hive's underlying relational database

4. You need to run the same job many times with minor variations. Rather than hardcoding all job configuration options in your drive code, you've decided to have your Driver subclass org.apache.hadoop.conf.Configured and implement the org.apache.hadoop.util.Tool interface.
Indentify which invocation correctly passes.mapred.job.name with a value of Example to Hadoop?

A) hadoop MyDrive -D mapred.job.name=Example input output
B) hadoop setproperty mapred.job.name=Example MyDriver input output
C) hadoop setproperty ("mapred.job.name=Example") MyDriver input output
D) hadoop "mapred.job.name=Example" MyDriver input output
E) hadoop MyDriver mapred.job.name=Example input output

5. For each input key-value pair, mappers can emit:

A) As many intermediate key-value pairs as designed, as long as all the keys have the same types and all the values have the same type.
B) One intermediate key-value pair, but of the same type.
C) One intermediate key-value pair, of a different type.
D) As many intermediate key-value pairs as designed. There are no restrictions on the types of those key-value pairs (i.e., they can be heterogeneous).
E) As many intermediate key-value pairs as designed, but they cannot be of the same type as the input key-value pair.

Solutions: